text stringlengths 89 2.49k | category stringclasses 19
values |
|---|---|
Propagating Speed of Primordial Gravitational Waves: Primordial Gravitational Waves, i.e. a background of metric perturbations
sourced by the quantum inflationary fluctuations, if measured, could both
provide a substantial evidence for primordial inflation and shed light on
physics at extremely high energy scales. In t... | astro-ph_CO |
Cosmological constraints on the velocity-dependent baryon-dark matter
coupling: We present the cosmological constraints on the cross section of baryon-dark
matter interactions for the dark matter mass below the MeV scale from the
Planck CMB (cosmic microwave background) and SDSS (Sloan Digital Sky Survey)
Lyman-$\alp... | astro-ph_CO |
On the apparent absence of broad iron lines in Seyfert galaxies: We present an analysis of XMM-Newton observations of eleven Seyfert galaxies
that appear to be missing a broad iron K alpha line. These objects represent a
challenge to the established paradigm for active galactic nuclei, where a
relatively cold accretion... | astro-ph_CO |
Gravitational lensing effects on sub-millimetre galaxy counts: We study the effects on the number counts of sub-millimetre galaxies due to
gravitational lensing. We explore the effects on the magnification cross
section due to halo density profiles, ellipticity and cosmological parameter
(the power-spectrum normalisati... | astro-ph_CO |
A fast and accurate method to compute the mass return from multiple
stellar populations: The mass returned to the ambient medium by aging stellar populations over
cosmological times sums up to a significant fraction (20% - 30% or more) of
their initial mass. This continuous mass injection plays a fundamental role in
... | astro-ph_CO |
The origin of dispersion in DLA metallicities: Recent chemical abundance measurements of damped Ly-alpha absorbers (DLAs)
revealed an intrinsic scatter in their metallicity of ~0.5 dex out to z~5. In
order to explore the origin of this scatter, we build a semi-analytic model
which traces the chemical evolution of the i... | astro-ph_CO |
Isotropy of low redshift type Ia Supernovae: A Bayesian analysis: The standard cosmology strongly relies upon the Cosmological Principle, which
consists on the hypotheses of large scale isotropy and homogeneity of the
Universe. Testing these assumptions is, therefore, crucial to determining if
there are deviations from... | astro-ph_CO |
Optimal filtering of optical and weak lensing data to search for galaxy
clusters: application to the COSMOS field: Galaxy clusters are usually detected in blind optical surveys via suitable
filtering methods. We present an optimal matched filter which maximizes their
signal-to-noise ratio by taking advantage of the k... | astro-ph_CO |
Clusters in the Disperse cosmic web: Galaxy cluster mass halos ("clusters") in a dark matter simulation are
matched to nodes in several different cosmic webs found using the Disperse
cosmic web finder. The webs have different simulation smoothings and Disperse
parameter choices; for each, 4 methods are considered for m... | astro-ph_CO |
Extraterrestrial Axion Search with the Breakthrough Listen Galactic
Center Survey: Axion dark matter (DM) may efficiently convert to photons in the
magnetospheres of neutron stars (NSs), producing nearly monochromatic radio
emission. This process is resonantly triggered when the plasma frequency
induced by the underl... | astro-ph_CO |
Is $w \neq -1$ evidence for a dynamical dark energy equation of state ?: Current constraints on the dark energy equation of state parameter, $w$, are
expected to be improved by more than one order of magnitude in the next decade.
If $|w-1| \gsim 0.01$ around the present time, but the dark energy dynamics is
sufficientl... | astro-ph_CO |
Does a 'stochastic' background of gravitational waves exist in the
pulsar timing band?: We investigate the effects of gravitational waves (GWs) from a simulated
population of binary super-massive black holes (SMBHs) on pulsar timing array
datasets. We construct a distribution describing the binary SMBH population
fro... | astro-ph_CO |
Scale-invariant enhancement of gravitational waves during inflation: The inflationary 1-loop tensor power spectrum from an excited spectator
scalar field is calculated. Recent studies on primordial black holes suggest
that the inflationary curvature perturbation may be huge on small scales. An
enhanced curvature pertur... | astro-ph_CO |
Witnessing the Formation of a Brightest Cluster Galaxy in a Nearby X-ray
Cluster: The central dominant galaxies in galaxy clusters constitute the most massive
and luminous galaxies in the Universe. Despite this, the formation of these
brightest cluster galaxies (BCGs) and the impact of this on the surrounding
cluster... | astro-ph_CO |
The Cosmic Web of Baryons: Only about 10% of the baryons in the universe lie in galaxies as stars or
cold gas, with the remainder predicted to exist as a dilute gaseous filamentary
network known as the Cosmic Web. Some of this gas is detected through UV
absorption line studies, but half of the gas remains undetected. G... | astro-ph_CO |
Mass-radius relation of Newtonian self-gravitating Bose-Einstein
condensates with short-range interactions: II. Numerical results: We develop the suggestion that dark matter could be a Bose-Einstein
condensate. We determine the mass-radius relation of a Newtonian
self-gravitating Bose-Einstein condensate with short-r... | astro-ph_CO |
Primordial non-gaussianity from the bispectrum of 21-cm fluctuations in
the dark ages: A measurement of primordial non-gaussianity will be of paramount importance
to distinguish between different models of inflation. Cosmic microwave
background (CMB) anisotropy observations have set unprecedented bounds on the
non-ga... | astro-ph_CO |
Is the expansion of the universe accelerating? All signs still point to
yes a local dipole anisotropy cannot explain dark energy: Type Ia supernovae (SNe Ia) provided the first strong evidence that the
expansion of the universe is accelerating. With SN samples now more than ten
times larger than those used for the or... | astro-ph_CO |
Bayesian evidence of the post-Planck curvaton: We perform a Bayesian model comparison for scenarios within the quadratic
curvaton model, determining the degree to which both are disfavoured with
respect to the $\Lambda$CDM concordance model and single-field quadratic
inflation, using the recent \emph{Planck} data relea... | astro-ph_CO |
Introduction to Early Universe Cosmology: Observational cosmology is in its "golden age" with a vast amount of recent
data on the distribution of matter and light in the universe. This data can be
used to probe theories of the very early universe. It is small amplitude
cosmological fluctuations which encode the informa... | astro-ph_CO |
A New Constraint on the Simulation of the Intergalactic Medium through
the Evolution of the Neutral Hydrogen Fraction in the Epoch of Reionization: The thermal history of the intergalactic medium is full of extremely useful
data in the field of astrophysics and cosmology. In other words, by examining
this environment... | astro-ph_CO |
Measuring Microlensing using Spectra of Multiply Lensed Quasars: We report on a program of spectroscopic observations of
gravitationally-lensed QSOs with multiple images. We seek to establish whether
microlensing is occurring in each QSO image using only single-epoch
observations. We calculate flux ratios for the cores... | astro-ph_CO |
Vector field instability and the primordial tensor spectrum: It has recently been shown that the presence of a spectator pseudoscalar
field, coupled to photons through a Chern-Simons term, can amplify the
primordial tensor spectrum without observationally disrupting the primordial
scalar spectrum. The amplification occ... | astro-ph_CO |
The Epoch of Reionization in the R_h=ct Universe: The measured properties of the epoch of reionization (EoR) show that
reionization probably began around z ~ 12-15 and ended by z=6. In addition, a
careful analysis of the fluctuations in the cosmic microwave background
indicate a scattering optical depth tau ~ 0.066+/-0... | astro-ph_CO |
The Spitzer Extragalactic Representative Volume Survey (SERVS): The
Environments of High-z SDSS Quasi-Stellar-Objects: This paper presents a study of the environments of SDSS Quasi-Stellar-Objects
(QSOs) in the Spitzer Extragalactic Representative Volume Survey (SERVS). We
concentrate on the high-redshift QSOs as the... | astro-ph_CO |
(Mis-)Interpreting supernovae observations in a lumpy universe: Light from `point sources' such as supernovae is observed with a beam width
of order of the sources' size - typically less than 1 AU. Such a beam probes
matter and curvature distributions that are very different from coarse-grained
representations in N-bod... | astro-ph_CO |
The Abundance Scatter in M33 from HII Regions: Is There Any Evidence for
Azimuthal Metallicity Variations?: Optical spectra of 25 H II regions in the inner two kpc of the M33 disk have
been obtained with the GMOS spectrograph at the Gemini North telescope. The
oxygen abundance gradient measured from the detection of ... | astro-ph_CO |
Reconstruction of Power Spectrum of Primordial Curvature Perturbations
on small scales from Primordial Black Hole Binaries scenario of LIGO/VIRGO
detection: As a candidate bound for the Binary Black Hole (BBH) merger events detected
by LIGO/Virgo, Primordial Black Holes (PBHs) provide a useful tool to
investigate t... | astro-ph_CO |
Blue Fermi Flat Spectrum Radio Quasars: Many blazars detected by the Fermi satellite, observed spectroscopically in
the optical, are line-less, and have been classified as BL Lac objects.
Optical-UV photometry of nearly one hundred of them allowed to determine the
redshift for a handful of objects and redshift upper li... | astro-ph_CO |
Internal dynamics of Abell 1240: a galaxy cluster with symmetric double
radio relics: We aim to obtain new insights into the internal dynamics of the cluster Abell
1240, showing the presence of two roughly symmetric radio relics, separated by
~2 h_70^-1 Mpc. Our analysis is mainly based on redshift data for 145 galax... | astro-ph_CO |
Broadband Imaging Segregation of z ~ 3 Ly-alpha Emitting and Ly-alpha
Absorbing Galaxies: The spectral properties of Lyman break galaxies (LBGs) offer a means to
isolate pure samples displaying either dominant Ly-alpha in absorption or
Ly-alpha in emission using broadband information alone. We present criteria
develo... | astro-ph_CO |
All-Sky Analysis of the General Relativistic Galaxy Power Spectrum: We perform an all-sky analysis of the general relativistic galaxy power
spectrum using the well-developed spherical Fourier decomposition. Spherical
Fourier analysis expresses the observed galaxy fluctuation in terms of the
spherical harmonics and sphe... | astro-ph_CO |
PNe as observational constraints in chemical evolution models for NGC
6822: Chemical evolution models are useful for understanding the formation and
evolution of stars and galaxies. Model predictions will be more robust as more
observational constraints are used. We present chemical evolution models for
the dwarf irr... | astro-ph_CO |
Non-Gaussianity from false vacuum inflation: Old curvaton scenario: We calculate the three-point correlation function of the comoving curvature
perturbation generated during an inflationary epoch driven by false vacuum
energy. We get a novel false vacuum shape bispectrum, which peaks in the
equilateral limit. Using thi... | astro-ph_CO |
Utilizing Astroinformatics to Maximize the Science Return of the Next
Generation Virgo Cluster Survey: The Next Generation Virgo Cluster Survey is a 104 square degree survey of the
Virgo Cluster, carried out using the MegaPrime camera of the
Canada-France-Hawaii telescope, from semesters 2009A-2012A. The survey will
... | astro-ph_CO |
Steve: A hierarchical Bayesian model for Supernova Cosmology: We present a new Bayesian hierarchical model (BHM) named Steve for performing
type Ia supernova (SNIa) cosmology fits. This advances previous works by
including an improved treatment of Malmquist bias, accounting for additional
sources of systematic uncertai... | astro-ph_CO |
A fast empirical method for galaxy shape measurements in weak lensing
surveys: We describe a simple and fast method to correct ellipticity measurements of
galaxies from the distortion by the instrumental and atmospheric point spread
function (PSF), in view of weak lensing shear measurements. The method performs
a cla... | astro-ph_CO |
The Link Between the Hidden Broad Line Region and the Accretion Rate in
Seyfert 2 Galaxies: In the past few years more and more pieces of evidence have been presented
for a revision of the widely accepted Unified Model of Active Galactic Nuclei.
A model based solely on orientation cannot explain all the observed
phen... | astro-ph_CO |
IC10: the history of the nearest starburst galaxy through its Planetary
Nebula and HII region populations: We report the results of spectroscopic observations, obtained with the Gemini
North Multi-Object Spectrograph, of 9 planetary nebulae (PNe) and 15 \hii\
regions located in the 5.5\arcmin $\times$5.5\arcmin inner... | astro-ph_CO |
The role of Dark Matter sub-halos in the non-thermal emission of galaxy
clusters: Annihilation of Dark Matter (DM) particles has been recognized as one of the
possible mechanisms for the production of non-thermal particles and radiation
in galaxy clusters. Previous studies have shown that, while DM models can
reprodu... | astro-ph_CO |
Improved Cosmological Constraints from SDSS redMaPPer Clusters via X-ray
Follow-up of a Complete Subsample of Systems: We improve upon the cosmological constraints derived from the abundance and
weak-lensing data of redMaPPer clusters detected in the Sloan Digital Sky
Survey (SDSS). Specifically, we derive gas mass d... | astro-ph_CO |
The zCOSMOS 20k Group Catalog: We present an optical group catalog between 0.1 < z < 1 based on 16,500
high-quality spectroscopic redshifts in the completed zCOSMOS-bright survey.
The catalog published herein contains 1498 groups in total and 192 groups with
more than five observed members. The catalog includes both gr... | astro-ph_CO |
An exploration of an early gravity transition in light of cosmological
tensions: We study a step-like transition in the value of the effective Planck mass (or
effective gravitational constant) on cosmological scales prior to
recombination. We employ CMB, BAO, and SNIa data and find they are sufficient
to strongly con... | astro-ph_CO |
Is the misalignment of the Local Group velocity and the 2MASS Redshift
Survey dipole typical in a LambdaCDM model?: We predict the acceleration of the Local Group generated by the 2MASS
Redshift Survey within the framework of LambdaCDM and the halo model of
galaxies. We show that as the galaxy fluctuations derived fr... | astro-ph_CO |
Instability in axion inflation with strong backreaction from gauge modes: We perform an analytical study of the stability of the background solution of
the model in which an inflaton, through an axionic coupling to a $U(1)$ gauge
field, causes an amplification of the gauge field modes that strongly backreact
on its dyn... | astro-ph_CO |
Testable dark energy predictions from current data: Given a class of dark energy models, constraints from one set of cosmic
acceleration observables make predictions for other observables. Here we
present the allowed ranges for the expansion rate H(z), distances D(z), and the
linear growth function G(z) (as well as oth... | astro-ph_CO |
Probing Parity Violation in the Stochastic Gravitational Wave Background
with Astrometry: Astrometry holds the potential for testing fundamental physics through the
effects of the Stochastic Gravitational Wave Background (SGWB) in the $\sim
1-100$ nHz frequency band on precision measurements of stellar positions. Suc... | astro-ph_CO |
Probing the anisotropic expansion history of the universe with cosmic
microwave background: We propose a simple technique to detect any anisotropic expansion stage in
the history of the universe starting from the inflationary stage to the surface
of last scattering from the CMBR data. We use the property that any ani... | astro-ph_CO |
Absence of concordance in a simple self-interacting neutrino cosmology: Some cosmic microwave background (CMB) data allow a cosmological scenario in
which the free streaming of neutrinos is delayed until close to
matter-radiation equality. Interestingly, recent analyses have revealed that
large-scale structure (LSS) da... | astro-ph_CO |
The role of Dark Matter sub-halos in the non-thermal emission of galaxy
clusters: Annihilation of Dark Matter (DM) particles has been recognized as one of the
possible mechanisms for the production of non-thermal particles and radiation
in galaxy clusters. Previous studies have shown that, while DM models can
reprodu... | astro-ph_CO |
All sky angular power spectrum: I. Estimating brightness temperature
fluctuations using TGSS 150 MHz survey: Measurements of the Galactic synchrotron emission is relevant for the 21-cm
studies from the Epoch of Reionization. The study of the synchrotron emission
is also useful to quantify the fluctuations in the magn... | astro-ph_CO |
Gödel-type universes and chronology protection in Horava-Lifshitz
gravity: In the attempts toward a quantum gravity theory, general relativity faces a
serious difficulty since it is non-renormalizable theory. Ho\v{r}ava-Lifshitz
gravity offers a framework to circumvent this difficulty, by sacrificing the
local Lorent... | astro-ph_CO |
A Bayesian analysis of redshifted 21-cm HI signal and foregrounds:
Simulations for LOFAR: Observations of the EoR with the 21-cm hyperfine emission of neutral hydrogen
(HI) promise to open an entirely new window onto the formation of the first
stars, galaxies and accreting black holes. In order to characterize the we... | astro-ph_CO |
Structure in Galaxy Distribution. III. Fourier Transforming the Universe: We demonstrate the effectiveness of a relatively straightforward analysis of
the complex 3D Fourier transform of galaxy coordinates derived from redshift
surveys. Numerical demonstrations of this approach are carried out on a
volume-limited sampl... | astro-ph_CO |
Simulations of helical inflationary magnetogenesis and gravitational
waves: Using numerical simulations of helical inflationary magnetogenesis in a low
reheating temperature scenario, we show that the magnetic energy spectrum is
strongly peaked at a particular wavenumber that depends on the reheating
temperature. Gra... | astro-ph_CO |
Inflation, Quantum Field Renormalization, and CMB Anisotropies: We point out that if quantum field renormalization is taken into account the
predictions of slow-roll inflation for both the scalar and tensorial power
spectra change significantly for wavelengths that today are at observable
scales | astro-ph_CO |
First measurement of the bulk flow of nearby galaxies using the cosmic
microwave background: Peculiar velocities in the nearby Universe can be measured via the kinetic
Sunyaev-Zel'dovich (kSZ) effect. Using a statistical method based on an
optimised cross-correlation with nearby galaxies, we extract the kSZ signal
ge... | astro-ph_CO |
All about baryons: revisiting SIDM predictions at small halo masses: We use cosmological hydrodynamic simulations to consistently compare the
assembly of dwarf galaxies in both $\Lambda$ dominated, Cold (CDM) and
Self--Interacting (SIDM) dark matter models. The SIDM model adopts a constant
cross section of 2 $cm^{2}/g$... | astro-ph_CO |
Calculation of the critical overdensity in the spherical-collapse
approximation: Critical overdensity $\delta_c$ is a key concept in estimating the number
count of halos for different redshift and halo-mass bins, and therefore, it is
a powerful tool to compare cosmological models to observations. There are
currently ... | astro-ph_CO |
The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ
Cluster Maps: The Atacama Cosmology Telescope (ACT) is currently observing the cosmic
microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277
GHz. In this paper, we present ACT's first results. Data have been analyzed
using a maximu... | astro-ph_CO |
Hot Gas, Cold Gas and Sub-Halos in a Lyman-alpha Blob at Redshift 2.38: We present integral field spectroscopy of a Lyman-alpha blob at redshift
2.38, with a spectral resolution three times better than previous published
work. As with previous observations, the blob has a chaotic velocity structure,
much of which break... | astro-ph_CO |
Arbitrating the $S_8$ discrepancy with growth rate measurements from
Redshift-Space Distortions: Within the $\Lambda$CDM model, measurements from recent Cosmic Microwave
Background (CMB) and weak lensing (WL) surveys have uncovered a $\sim 3\sigma$
disagreement in the inferred value of the parameter $S_8 \equiv
\sigm... | astro-ph_CO |
Extragalactic dark matter and direct detection experiments: Recent astronomical data strongly suggest that a significant part of the dark
matter, composing the Local Group and Virgo Supercluster, is not incorporated
into the galaxy haloes and forms diffuse components of these galaxy clusters.
Apparently, a portion of t... | astro-ph_CO |
A general framework to test gravity using galaxy clusters III:
Observable-mass scaling relations in $f(R)$ gravity: We test two methods, including one that is newly proposed in this work, for
correcting for the effects of chameleon $f(R)$ gravity on the scaling relations
between the galaxy cluster mass and four obser... | astro-ph_CO |
Testing theories in barred spiral galaxies: According to one version of the recently proposed "manifold" theory that
explains the origin of spirals and rings in relation to chaotic orbits,
galaxies with stronger bars should have a higher spiral arms pitch angle when
compared to galaxies with weaker bars. A sub-sample o... | astro-ph_CO |
Probing below the neutrino floor with the first generation of stars: We show that the mere observation of the first stars (Pop III stars) in the
universe can be used to place tight constraints on the strength of the
interaction between dark matter and regular, baryonic matter. We apply this
technique to a candidate Pop... | astro-ph_CO |
Absence of a Periodic Component in Quasar z-Distribution: Since the discovery of quasars in papers often appeared and appear the
assertions that the redshift quasar distribution includes a periodic component
with the period $\Delta z = 0.063$ or 0.11. A statement of such kind, if it is
correct, may manifest the existen... | astro-ph_CO |
An Improved Calculation of the Non-Gaussian Halo Mass Function: The abundance of collapsed objects in the universe, or halo mass function, is
an important theoretical tool in studying the effects of primordially generated
non-Gaussianities on the large scale structure. The non-Gaussian mass function
has been calculated... | astro-ph_CO |
A new analysis of fine-structure constant measurements and modelling
errors from quasar absorption lines: We present an analysis of 23 absorption systems along the lines of sight
towards 18 quasars in the redshift range of $0.4 \leq z_{abs} \leq 2.3$
observed on the Very Large Telescope (VLT) using the Ultraviolet an... | astro-ph_CO |
Photodissociation chemistry footprints in the Starburst galaxy NGC 253: We report the first detection of PDR molecular tracers, namely HOC+, and CO+,
and confirm the detection of the also PDR tracer HCO towards the starburst
galaxy NGC 253, claimed to be mainly dominated by shock heating and in an
earlier stage of evol... | astro-ph_CO |
$H_0$ Tension, Phantom Dark Energy and Cosmological Parameter
Degeneracies: Phantom dark energy can produce amplified cosmic acceleration at late times,
thus increasing the value of $H_0$ favored by CMB data and releasing the
tension with local measurements of $H_0$. We show that the best fit value of
$H_0$ in the co... | astro-ph_CO |
Velocity waves in the Hubble diagram: signature of local galaxy clusters: The Universe expansion rate is modulated around local inhomogeneities due to
their gravitational potential. Velocity waves are then observed around galaxy
clusters in the Hubble diagram. This paper studies them in a ~738 Mpc wide,
with 2048^3 par... | astro-ph_CO |
How clustering dark energy affects matter perturbations: The rate of structure formation in the Universe is different in homogeneous
and clustered dark energy models. The degree of dark energy clustering depends
on the magnitude of its effective sound speed $c^{2}_{\rm eff}$ and for $c_{\rm
eff}=0$ dark energy clusters... | astro-ph_CO |
Newtonian acceleration scales in spiral galaxies: We revisit the issue of the constancy of the dark matter (DM) and baryonic
Newtonian acceleration scales within the DM scale radius by considering a large
sample of late - type galaxies. We rely on a Markov Chain Monte Carlo (MCMC)
method to estimate the parameters of t... | astro-ph_CO |
New Strong Line Abundance Diagnostics for \HII Regions: Effects of
$κ$-Distributed Electron Energies and New Atomic Data: Recently, \citet{Nicholls12}, inspired by \emph{in situ} observations of
solar system astrophysical plasmas, suggested that the electrons in \HII
regions are characterised by a $\kappa$-distributi... | astro-ph_CO |
Cosmology-marginalized approaches in Bayesian model comparison: the
neutrino mass as a case study: We propose here a \emph{novel} method which singles out the \emph{a priori}
unavoidable dependence on the underlying cosmological model when extracting
parameter constraints, providing robust limits which only depend on... | astro-ph_CO |
Measuring the global 21-cm signal with the MWA-I: improved measurements
of the Galactic synchrotron background using lunar occultation: We present early results from a project to measure the sky-averaged (global),
redshifted $21\,$cm signal from the Epoch of Reionisation (EoR), using the
Murchison Widefield Array (MW... | astro-ph_CO |
Constraints on the abundance of primordial black holes with different
mass distributions from lensing of fast radio bursts: Primordial black holes (PBHs) has been considered to form a part of dark
matter for a long time but the possibility has been poorly constrained over a
wide mass range, including the stellar mass... | astro-ph_CO |
Evolution of X-ray Cavities in Galaxy Clusters: The physics of X-ray cavities in galaxy clusters is constrained by their
observed morphological evolution, which depends on such poorly-understood
properties as the turbulent density field and magnetic fields. Here we combine
numerical simulations that include subgrid tur... | astro-ph_CO |
A Redshift Survey of Herschel Far-Infrared Selected Starbursts and
Implications for Obscured Star Formation: We present Keck spectroscopic observations and redshifts for a sample of 767
Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500um, taken with the
Keck I Low Resolution Imaging Spectrometer (LRIS) and... | astro-ph_CO |
A new gravitational N-body simulation algorithm for investigation of
cosmological chaotic advection: Recently alternative approaches in cosmology seeks to explain the nature of
dark matter as a direct result of the non-linear spacetime curvature due to
different types of deformation potentials. In this context, a key... | astro-ph_CO |
The evolution of galaxy intrinsic alignments in the MassiveBlack II
universe: We investigate the redshift evolution of the intrinsic alignments (IA) of
galaxies in the \texttt{MassiveBlackII} (MBII) simulation. We select galaxy
samples above fixed subhalo mass cuts ($M_h>10^{11,12,13}~M_{\odot}/h$) at
$z=0.6$ and tra... | astro-ph_CO |
The (black hole mass)-(host spheroid luminosity) relation at high and
low masses, the quadratic growth of black holes, and intermediate-mass black
hole candidates: From a sample of 72 galaxies with reliable supermassive black hole masses
M_(bh), we derive the M_(bh)-(host spheroid luminosity, L) relation for (i) th... | astro-ph_CO |
The eROSITA Final Equatorial-Depth Survey (eFEDS): Characterization of
Morphological Properties of Galaxy Groups and Clusters: Understanding the cluster population of clusters of galaxies is of the utmost
importance for using cluster samples in both astrophysical and cosmological
studies. We present an in-depth analy... | astro-ph_CO |
Relativistic and non-Gaussianity contributions to the one-loop power
spectrum: We compute the one-loop density power spectrum including Newtonian and
relativistic contributions, as well as the primordial non-Gaussianity
contributions from $f_{\rm NL}$ and $g_{\rm NL}$ in the local configuration. To
this end we take s... | astro-ph_CO |
Hunting WIMPs with LISA: Correlating dark matter and gravitational wave
signals: The thermal freeze-out mechanism in its classical form is tightly connected
to physics beyond the Standard Model around the electroweak scale, which has
been the target of enormous experimental efforts. In this work we study a dark
matte... | astro-ph_CO |
Intrinsic Shapes of Very Flat Elliptical Galaxies: Photometric data from the literature is combined with triaxial mass models to
derive variation in the intrinsic shapes of the light distribution of
elliptical galaxies NGC 720, 2768 and 3605. The inferred shape variation in
given by a Bayesian probability distribution,... | astro-ph_CO |
Inflationary tensor fossils in large-scale structure: Inflation models make specific predictions for a tensor-scalar-scalar
three-point correlation, or bispectrum, between one gravitational-wave (tensor)
mode and two density-perturbation (scalar) modes. This tensor-scalar-scalar
correlation leads to a local power quadr... | astro-ph_CO |
The 6x2pt method: supernova velocities meet multiple tracers: We present a new methodology to analyse in a comprehensive way large-scale
and supernovae (or any other distance indicator) surveys. Our approach combines
galaxy and supernova position and redshift data with supernova peculiar
velocities, obtained through th... | astro-ph_CO |
Evidence for Three Accreting Black Holes in a Galaxy at z~1.35: A
Snapshot of Recently Formed Black Hole Seeds?: One of the key open questions in cosmology today pertains to understanding
when, where and how super massive black holes form, while it is clear that
mergers likely play a significant role in the growth cy... | astro-ph_CO |
Contamination of the Epoch of Reionization power spectrum in the
presence of foregrounds: We construct foreground simulations comprising spatially correlated
extragalactic and diffuse Galactic emission components and calculate the
`intrinsic' (instrument-free) two-dimensional spatial power spectrum and the
cylindrica... | astro-ph_CO |
Induced Gravity and the Attractor Dynamics of Dark Energy/Dark Matter: Attractor solutions that give dynamical reasons for dark energy to act like
the cosmological constant, or behavior close to it, are interesting
possibilities to explain cosmic acceleration. Coupling the scalar field to
matter or to gravity enlarges ... | astro-ph_CO |
A Survey of z~6 Quasars in the SDSS Deep Stripe. II. Discovery of Six
Quasars at z_{AB}>21: We present the discovery of six new quasars at z~6 selected from the Sloan
Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by
repeatedly scanning a stripe along the celestial equator. The six quasars ... | astro-ph_CO |
Accurate photometric redshift probability density estimation - method
comparison and application: We introduce an ordinal classification algorithm for photometric redshift
estimation, which significantly improves the reconstruction of photometric
redshift probability density functions (PDFs) for individual galaxies a... | astro-ph_CO |
Testing physical models for dipolar asymmetry with CMB polarization: The cosmic microwave background (CMB) temperature anisotropies exhibit a
large-scale dipolar power asymmetry. To determine whether this is due to a
real, physical modulation or is simply a large statistical fluctuation requires
the measurement of new ... | astro-ph_CO |
Curvature Perturbations and non-Gaussianities from Waterfall Phase
Transition during Inflation: We consider a variant of hybrid inflation where the waterfall phase
transition happens during inflation. By adjusting the parameters associated
with the mass of the waterfall field we arrange that the phase transition is
n... | astro-ph_CO |
Observational constraints on the metagalactic Ly$α$ photon
scattering rate at high redshift: The scattering of Ly$\alpha$ photons from the first radiating sources in the
Universe plays a pivotal role in 21-cm radio detections of Cosmic Dawn and the
Epoch of Reionization through the Wouthuysen-Field effect. New data f... | astro-ph_CO |
Discovery of a diffuse optical line emitting halo in the core of the
Centaurus cluster of galaxies: Line emission outside the protection of the
filaments: We present the discovery of diffuse optical line emission in the Centaurus
cluster seen with the MUSE IFU. The unparalleled sensitivity of MUSE allows us
to dete... | astro-ph_CO |
Multiwavelength study of nearly face-on low surface brightness disk
galaxies: We study the ages of a large sample (1,802) of nearly face-on disk low
surface brightness galaxies (LSBGs) by using the evolutionary population
synthesis (EPS) model PEGASE with exponential decreasing star formation rate to
fit their multiw... | astro-ph_CO |
Large-Scale Clustering of Cosmic Voids: We study the clustering of voids using $N$-body simulations and simple
theoretical models. The excursion-set formalism describes fairly well the
abundance of voids identified with the watershed algorithm, although the void
formation threshold required is quite different from the ... | astro-ph_CO |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.