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Weighing neutrinos in $f(R)$ gravity in light of BICEP2: We constrain the neutrino mass in $f(R)$ gravity using the latest
observations from the Planck, BAO and BICEP2 data. We find that the measurement
on the B-modes can break the degeneracy between the massive neutrinos and the
$f(R)$ gravity. We find a non-zero valu... | astro-ph_CO |
Complementary Cosmological Simulations: Cosmic variance limits the accuracy of cosmological N-body simulations,
introducing bias in statistics such as the power spectrum, halo mass function,
or the cosmic shear. We provide new methods to measure and reduce the effect of
cosmic variance in existing and new simulations. ... | astro-ph_CO |
The Type Ia Supernova Color-Magnitude Relation and Host Galaxy Dust: A
Simple Hierarchical Bayesian Model: Conventional Type Ia supernova (SN Ia) cosmology analyses currently use a
simplistic linear regression of magnitude versus color and light curve shape,
which does not model intrinsic SN Ia variations and host ga... | astro-ph_CO |
Radio selection of the most distant galaxy clusters: We show that the most distant X-ray detected cluster known to date, ClJ1001
at z=2.506, hosts a strong overdensity of radio sources. Six of them are
individually detected (within 10") in deep 0.75" resolution VLA 3GHz imaging,
with S(3GHz)>8uJy. Of the six, AGN likel... | astro-ph_CO |
Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies: We review the observed demographics and inferred evolution of supermassive
black holes (BHs) found by dynamical modeling of spatially resolved kinematics.
Most influential was the discovery of a tight correlation between BH mass and
the velocity disper... | astro-ph_CO |
Relationship between the CMB, SZ Cluster Counts, and Local Hubble
Parameter Measurements in a Simple Void Model: The discrepancy between the amplitudes of matter fluctuations inferred from
Sunyaev-Zel'dovich (SZ) cluster number counts, the primary temperature, and the
polarization anisotropies of the cosmic microwave... | astro-ph_CO |
Color and stellar population gradients in galaxies. Correlation with
mass: We analyze the color gradients (CGs) of ~50000 nearby SDSS galaxies. From
synthetic spectral models based on a simplified star formation recipe, we
derive the mean spectral properties, and explain the observed radial trends of
the color as gra... | astro-ph_CO |
Dark matter profiles of SPARC galaxies: a challenge to fuzzy dark matter: Stellar and gas kinematics of galaxies are a sensitive probe of the dark
matter distribution in the halo. The popular fuzzy dark matter models predict
the peculiar shape of density distribution in galaxies: specific dense core
with sharp transiti... | astro-ph_CO |
Bounds from ISW-galaxy cross-correlations on generalized covariant
Galileon models: Several modified cosmological models exist, which also try to address the
tensions between data and predictions of the $\Lambda$-CDM model. Galileon
models are particular scalar tensor theories that represent one such
possibilities. W... | astro-ph_CO |
The Dark Matter Density in the Solar Neighborhood reconsidered: Both the gas flaring and the dip in the rotation curve, which was recently
reconfirmed with precise measurements using the VERA VLBI array in Japan,
suggest doughnut-like substructure in the dark matter (DM) halo. A global fit
to all available data shows t... | astro-ph_CO |
On the Evolution of the Cores of Radio Sources and Their Extended Radio
Emission: The work in this paper aims at determining the evolution and possible
co-evolution of radio-loud active galactic nuclei (AGNs) and their cores via
their radio luminosity functions (i.e., total and core RLF respectively). Using
a large c... | astro-ph_CO |
Evaluating the Calorimeter Model with Broadband, Continuous Spectra of
Starburst Galaxies Observed with the Allen Telescope Array: Although the relationship between the far-infrared and cm-wave radio
luminosities of normal galaxies is one of the most striking correlations in
astronomy, a solid understanding of its ph... | astro-ph_CO |
Magnetic field amplification by shocks in galaxy clusters: application
to radio relics: Merger shocks induce turbulence in the intra-cluster medium (ICM), and, under
some circumstances, accelerate electrons to relativistic velocities to form
so-called radio relics. Relics are mostly found at the periphery of galaxy
c... | astro-ph_CO |
The Nature of the Warm/Hot Intergalactic Medium I. Numerical Methods,
Convergence, and OVI Absorption: We perform a series of cosmological simulations using Enzo, an Eulerian
adaptive-mesh refinement, N-body + hydrodynamical code, applied to study the
warm/hot intergalactic medium. The WHIM may be an important compon... | astro-ph_CO |
Environmental dependence of bulge-dominated galaxy sizes in hierarchical
models of galaxy formation. Comparison with the local Universe: We compare state-of-the-art semi-analytic models of galaxy formation as well
as advanced sub-halo abundance matching models with a large sample of
early-type galaxies from SDSS at z... | astro-ph_CO |
Starlet l1-norm for weak lensing cosmology: We present a new summary statistic for weak lensing observables, higher than
second order, suitable for extracting non-Gaussian cosmological information and
inferring cosmological parameters. We name this statistic the 'starlet
$\ell_1$-norm' as it is computed via the sum of ... | astro-ph_CO |
X-ray measurement of the elemental abundances at the outskirts of the
Perseus cluster with Suzaku: We report on the abundance of metals (Mg and Fe) in the intracluster medium
(ICM) at the outskirts (0.2 r200 - 0.8 r200) of the Perseus cluster. The X-ray
spectra were obtained in the Suzaku/XIS mapping observations of ... | astro-ph_CO |
Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio
AGN: Evidence for Continuous AGN Heating: We examine atmospheric heating by radio active galactic nuclei (AGN) in
distant X-ray clusters by cross correlating clusters selected from the 400
Square Degree (400SD) X-ray Cluster survey with radio source... | astro-ph_CO |
CfA3: 185 Type Ia Supernova Light Curves from the CfA: We present multi-band photometry of 185 type-Ia supernovae (SN Ia), with over
11500 observations. These were acquired between 2001 and 2008 at the F. L.
Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA).
This sample contains the largest n... | astro-ph_CO |
A Halo Model with Environment Dependence: Theoretical Considerations: We present a modification of the standard halo model with the goal of
providing an improved description of galaxy clustering. Recent surveys, like
the Sloan Digital Sky Survey (SDSS) and the Anglo-Australian Two-degree survey
(2dF), have shown that t... | astro-ph_CO |
Non-Gaussianity from Isocurvature Perturbations : Analysis of
Trispectrum: Non-Gaussianity may exist in the CDM isocurvature perturbation. We provide
general expressions for the bispectrum and trispectrum of both adiabatic and
isocurvature pertubations. We apply our result to the QCD axion case, and found
a consisten... | astro-ph_CO |
Accretion of Galaxies around Supermassive Black Holes and a Theoretical
Model of the Tully-Fisher and M-Sigma Relations: The observed Tully-Fisher and Faber-Jackson laws between the baryonic mass of
galaxies and the velocity of motion of stars at the edge of galaxies are
explained within the framework of the model of... | astro-ph_CO |
The ability of Lisa, Taiji, and their networks to detect the stochastic
gravitational wave background generated by Cosmic Strings: The cosmic string contributes to our understanding and revelation of the
fundamental structure and evolutionary patterns of the universe, unifying our
knowledge of the cosmos and unveilin... | astro-ph_CO |
An analytical approximation of the luminosity distance in flat
cosmologies with a cosmological constant: We present an analytical approximation formula for the luminosity distance in
spatially flat cosmologies with dust and a cosmological constant. Apart from
the overall factor, the effect of non-zero cosmological co... | astro-ph_CO |
Weak Lensing Measurements in Simulations of Radio Images: We present a study of weak lensing shear measurements for simulated galaxy
images at radio wavelengths. We construct a simulation pipeline into which we
can input galaxy images of known ellipticity, and with which we then simulate
observations with eMERLIN and t... | astro-ph_CO |
A Universe without Dark Energy and Dark Matter: The universe has evolved to be a filamentary web of galaxies and large
inter-galactic zones of space without matter. The Euclidian nature of the
universe indicates that it is not a 3D manifold within space with an extra
spatial dimension. This justifies our assumption tha... | astro-ph_CO |
Searching for spin-2 ULDM with gravitational waves interferometers: The detection of gravitational waves from merging binaries has ushered in the
era of gravitational wave interferometer astronomy. Besides these strong,
transient, calamitous events, much weaker signals can be detected if the
oscillations are nearly mon... | astro-ph_CO |
Constraints on a mixed model of dark matter particles and primordial
black holes from the Galactic 511 keV line: The galactic 511 keV gamma-ray line has been observed since 1970's, and was
identified as the result of electron-positron annihilation, but the origin of
such positrons is still not clear. Apart from the a... | astro-ph_CO |
The Carnegie Supernova Project: Light Curve Fitting with SNooPy: In providing an independent measure of the expansion history of the Universe,
the Carnegie Supernova Project (CSP) has observed 71 high-z Type Ia supernovae
(SNe Ia) in the near-infrared bands Y and J. These can be used to construct
rest-frame i-band ligh... | astro-ph_CO |
Star formation in galaxy interactions and mergers: This lecture reviews the fundamental physical processes involved in star
formation in galaxy interactions and mergers. Interactions and mergers often
drive intense starbursts, but the link between interstellar gas physics, large
scale interactions, and active star form... | astro-ph_CO |
Exploring 21cm - Lyman Alpha emitter synergies for SKA: We study the signatures of reionization and ionizing properties of the early
galaxies in the cross-correlations between the 21cm emission from the spin-flip
transition of neutral hydrogen (HI) and the underlying galaxy population, in
particular a sub-population of... | astro-ph_CO |
Dark energy in light of the early JWST observations: case for a negative
cosmological constant?: Early data from the James Webb Space Telescope (JWST) has uncovered the
existence of a surprisingly abundant population of very massive galaxies at
extremely high redshift, which are hard to accommodate within the standar... | astro-ph_CO |
Curvaton preheating revisited: We study the thermalization process in the self-interacting curvaton
preheating scenario. We solve the evolution of the system with classical
lattice simulations with a recently released symplectic PyCOOL program during
the resonance and the early thermalization periods and compare the re... | astro-ph_CO |
Simulation-based inference of dynamical galaxy cluster masses with 3D
convolutional neural networks: We present a simulation-based inference framework using a convolutional
neural network to infer dynamical masses of galaxy clusters from their observed
3D projected phase-space distribution, which consists of the proj... | astro-ph_CO |
Lagrangian bias of generic large-scale structure tracers: The dark matter halos that host galaxies and clusters form out of initial
high-density patches, providing a biased tracer of the linear matter density
field. In the simplest local bias approximation, the halo field is treated as a
perturbative series in the aver... | astro-ph_CO |
The growth of density perturbations in the last $\sim$10 billion years
from tomographic large-scale structure data: In order to investigate the origin of the ongoing tension between the
amplitude of matter fluctuations measured by weak lensing experiments at low
redshifts and the value inferred from the cosmic microw... | astro-ph_CO |
Pre-galactic metal enrichment - The chemical signatures of the first
stars: The emergence of the first sources of light at redshifts of z ~ 10-30
signaled the transition from the simple initial state of the Universe to one of
increasing complexity. We review recent progress in our understanding of the
formation of th... | astro-ph_CO |
Dynamics of minimally coupled dark energy in spherical halos of dark
matter: We analyse the evolution of scalar field dark energy in the spherical halos
of dark matter at the late stages of formation of gravitationally bound systems
in the expanding Universe. The dynamics of quintessential dark energy at the
center o... | astro-ph_CO |
Modeling the clustering of dark-matter haloes in resummed perturbation
theories: We address the issue of the cosmological bias between matter and galaxy
distributions, looking at dark-matter haloes as a first step to characterize
galaxy clustering. Starting from the linear density field at high redshift, we
follow th... | astro-ph_CO |
What we can learn from the spectral index of the tensor mode: If the beginning of inflation is defined at the moment when the vacuum energy
of the inflaton starts to dominate, the energy density of the other fields at
that moment is (by definition) comparable to the inflaton. Although the
fraction will be small at the ... | astro-ph_CO |
Regularization Scheme Dependence of the Counterterms in the Galaxy Bias
Expansion: In this paper we explore how different regularization prescriptions affect
the counterterms in the renormalization of the galaxy bias expansion. We work
in the context of primordial local non-Gaussianity including non-linear
gravitatio... | astro-ph_CO |
The large-scale diffuse radio emission in A781: A781 belongs to a complex system characterized by extended X-ray emissions
that may form part of line of clusters of galaxies along a filament. The aim of
this work is to investigate the possible presence of extended, diffuse
synchrotron radio emission connected to the in... | astro-ph_CO |
The X-ray spectral properties of the AGN population in the XMM-Newton
bright serendipitous survey: We present here a detailed X-ray spectral analysis of the AGN belonging to
the XMM-Newton bright survey (XBS) that comprises more than 300 AGN up to
redshift ~ 2.4. We performed an X-ray analysis following two different... | astro-ph_CO |
Statistical anisotropy of CMB as a probe of conformal rolling scenario: Search for the statistical anisotropy in the CMB data is a powerful tool for
constraining models of the early Universe. In this paper we focus on the
recently proposed cosmological scenario with conformal rolling. We consider two
sub-scenarios, one... | astro-ph_CO |
Polar Ring Galaxies in the Galaxy Zoo: We report observations of 16 candidate polar ring galaxies (PRGs) identified
by the Galaxy Zoo project in the Sloan Digital Sky Survey (SDSS) database. Deep
images of five galaxies are available in the SDSS Stripe82 database, while to
reach similar depth we observed the remaining ... | astro-ph_CO |
Constraining Dust and Molecular Gas Properties in Lyman Alpha Blobs at
z~3: In order to constrain the bolometric luminosities, dust properties and
molecular gas content of giant Lyman alpha nebulae, the so-called Lyman alpha
blobs, we have carried out a study of dust continuum and CO line emission in
two well-studied... | astro-ph_CO |
Effects of boosting on extragalactic components: methods and statistical
studies: In this work we examine the impact of our motion with respect to the CMB rest
frame on statistics of CMB maps by examining the one-, two-, three- and four-
point statistics of simulated maps of the CMB and Sunyaev-Zeldovich (SZ)
effects... | astro-ph_CO |
Non-Gaussian Scatter in Cluster Scaling Relations: We investigate the impact of non-Gaussian scatter in the cluster
mass-observable scaling relation on the mass and redshift distribution of
clusters detected by wide area surveys. We parameterize non-Gaussian scatter by
incorporating the third and forth moments (skewnes... | astro-ph_CO |
A new probe of Axion-Like Particles: CMB polarization distortions due to
cluster magnetic fields: We propose using the upcoming Cosmic Microwave Background (CMB) ground based
experiments to detect the signal of ALPs (Axion like particles) interacting
with magnetic fields in galaxy clusters. The conversion between CMB... | astro-ph_CO |
Bayesian inferences of galaxy formation from the K-band luminosity and
HI mass functions of galaxies: constraining star formation and feedback: We infer mechanisms of galaxy formation for a broad family of semi-analytic
models (SAMs) constrained by the K-band luminosity function and HI mass
function of local galaxies... | astro-ph_CO |
The background Friedmannian Hubble constant in relativistic
inhomogeneous cosmology and the age of the Universe: In relativistic inhomogeneous cosmology, structure formation couples to
average cosmological expansion. A conservative approach to modelling this
assumes an Einstein--de Sitter model (EdS) at early times a... | astro-ph_CO |
Relativistic static magnetized finite thin disk: An infinite family of
exact solutions: An infinite family of relativistic finite thin disk model with magnetic field
is presented. The model is obtained for solving the Einstein-Maxwell equations
for static spacetimes by means of the Horsk\'y-Mitskievitch generating
co... | astro-ph_CO |
The evolution of dusty torus covering factor in quasars: We have assembled a large sample of 5996 quasars at redshift 2.0=< z <= 2.4
(high-z) or 0.7=< z <= 1.1 (low-z) from SDSS data release nine and seven quasar
catalogs. The spectral energy distribution (SED) of quasars were constructed by
collecting WISE, UKIDSS, an... | astro-ph_CO |
On the tension between growth rate and CMB data: We analyze the claimed tension between redshift space distorsions
measurements of $f(z)\sigma_8(z)$ and the predictions of standard $\Lambda$CDM
(Planck 2015 and 2018) cosmology. We consider a dataset consisting of 17 data
points extending up to redshift $z=1.52$ and cor... | astro-ph_CO |
Detection of Cosmic Magnification via Galaxy Shear -- Galaxy Number
Density Correlation from HSC Survey Data: We propose a novel method to detect cosmic magnification signals by
cross-correlating foreground convergence fields constructed from galaxy shear
measurements with background galaxy positional distributions, ... | astro-ph_CO |
H0 Revisited: I reanalyse the Riess et al. (2011, hereafter R11) Cepheid data using the
revised geometric maser distance to NGC 4258 of Humphreys et al. (2013). I
explore different outlier rejection criteria designed to give a reduced
chi-squared of unity and compare the results with the R11 rejection algorithm,
which ... | astro-ph_CO |
Growth of matter perturbations in the extended viscous dark energy
models: In this work, we study the extended viscous dark energy models in the context
of matter perturbations. To do this, we assume an alternative interpretation of
the flat Friedmann-Lema\^itre-Robertson-Walker Universe, through the
nonadditive entr... | astro-ph_CO |
SDSS superclusters: morphology and galaxy content: We compare the galaxy populations in superclusters of different morphology in
the nearby Universe (180 < d < 270 Mpc) to see whether the inner structure and
overall morphology of superclusters are important in shaping galaxy properties
in superclusters. Supercluster mo... | astro-ph_CO |
The state of the dark energy equation of state circa 2023: We critically examine the state of current constraints on the dark energy
(DE) equation of state (EoS) $w$. Our study is partially motivated by the
observation that, while broadly consistent with the cosmological constant value
$w=-1$, several independent probe... | astro-ph_CO |
The supermassive black hole mass - Sérsic index relations for bulges
and elliptical galaxies: Scaling relations between supermassive black hole mass, M_BH, and host galaxy
properties are a powerful instrument for studying their coevolution. A complete
picture involving all of the black hole scaling relations, in whic... | astro-ph_CO |
Gas and dark matter in the Sculptor group: NGC 55: We present new, sensitive HI observations of the Sculptor group galaxy NGC 55
with the Australia Telescope Compact Array. We achieve a 5 sigma HI column
density sensitivity of 10^19 cm^-2 over a spectral channel width of 8 km/s for
emission filling the 158" x 84" synth... | astro-ph_CO |
ALFALFA HI Data Stacking II. HI content of the host galaxies of AGN: We use a stacking technique to measure the average HI content of a
volume-limited sample of 1871 AGN host galaxies from a parent sample of
galaxies selected from the SDSS and GALEX imaging surveys with stellar masses
greater than 10^10 M_sun and redsh... | astro-ph_CO |
Galaxy properties in clusters. II. Backsplash Galaxies: We explore the properties of galaxies on the outskirts of clusters and their
dependence on recent dynamical history in order to understand the real impact
that the cluster core has on the evolution of galaxies. We analyse the
properties of more than 1000 galaxies ... | astro-ph_CO |
The Galactic Halo in Mixed Dark Matter Cosmologies: A possible solution to the small scale problems of the cold dark matter (CDM)
scenario is that the dark matter consists of two components, a cold and a warm
one. We perform a set of high resolution simulations of the Milky Way halo
varying the mass of the WDM particle... | astro-ph_CO |
Cosmology from weak lensing of CMB: The weak lensing effect on the cosmic microwave background (CMB) induces
distortions in spatial pattern of CMB anisotropies, and statistical properties
of CMB anisotropies become a weakly non-Gaussian field. We first summarize the
weak lensing effect on the CMB (CMB lensing) in the p... | astro-ph_CO |
The Mira Distance Ladder: Here we provide a review of Mira variables, their basic properties, and
Period-Luminosity Relations with an emphasis on their role in measuring the
Hubble Constant. The usage of multiple independent distance indicators and
methods is crucial to cross-checking systematic uncertainties in distan... | astro-ph_CO |
Mitigating the impact of the CIB on galaxy cluster SZ detection with
spectrally constrained matched filters: Galaxy clusters detected through the thermal Sunyaev-Zeldovich (tSZ) effect
are a powerful cosmological probe from which constraints on cosmological
parameters such as $\Omega_{\mathrm{m}}$ and $\sigma_8$ can ... | astro-ph_CO |
Principal components of dark energy with SNLS supernovae: the effects of
systematic errors: We study the effects of current systematic errors in Type Ia supernova (SN
Ia) measurements on dark energy (DE) constraints using current data from the
Supernova Legacy Survey (SNLS). We consider how SN systematic errors affec... | astro-ph_CO |
Energetic galaxy-wide outflows in high-redshift ultra-luminous infrared
galaxies hosting AGN activity: We present integral field spectroscopy observations, covering the [O
III]4959,5007 emission-line doublet of eight high-redshift (z=1.4-3.4)
ultra-luminous infrared galaxies (ULIRGs) that host Active Galactic Nuclei
... | astro-ph_CO |
Inferences of $H_0$ in presence of a non-standard recombination: Measurements of the Hubble parameter from the distance ladder are in tension
with indirect measurements based on the cosmic microwave background (CMB) data
and the inverse distance ladder measurements at 3-4 $\sigma$ level. We consider
phenomenological mo... | astro-ph_CO |
First Constraints on Small-Scale Non-Gaussianity from UV Galaxy
Luminosity Functions: UV luminosity functions provide a wealth of information on the physics of
galaxy formation in the early Universe. Given that this probe indirectly tracks
the evolution of the mass function of dark matter halos, it has the potential
... | astro-ph_CO |
Redshift and distances in a ΛCDM cosmology with non-linear
inhomogeneities: Motivated by the dawn of precision cosmology and the wealth of forthcoming
high precision and volume galaxy surveys, in this paper we study the effects of
inhomogeneities on light propagation in a flat \Lambda CDM background. To this
end we u... | astro-ph_CO |
The Stellar Halos of Massive Elliptical Galaxies II: Detailed Abundance
Ratios at Large Radius: We study the radial dependence in stellar populations of 33 nearby early-type
galaxies with central stellar velocity dispersions sigma* > 150 km/s. We
measure stellar population properties in composite spectra, and use rat... | astro-ph_CO |
The contribution of star-forming galaxies to fluctuations in the cosmic
background light: Star-forming galaxies which are too faint to be detected individually produce
intensity fluctuations in the cosmic background light. This contribution needs
to be taken into account as a foreground when using the primordial sign... | astro-ph_CO |
The VIMOS Public Extragalactic Redshift Survey (VIPERS): A quiescent
formation of massive red-sequence galaxies over the past 9 Gyr: We explore the evolution of the Colour-Magnitude Relation (CMR) and
Luminosity Function (LF) at 0.4<z<1.3 from the VIMOS Public Extragalactic
Redshift Survey (VIPERS) using ~45,000 gala... | astro-ph_CO |
Observational Constraints on Varying-alpha Domain Walls: We consider the possibility that current hints of spatial variations of the
fine structure constant at high redshift, based on VLT/UVES and Keck/HIRES
observations, could be caused by a biased domain wall network described by a
scalar field non-minimally coupled ... | astro-ph_CO |
Star Formation Indicators and Line Equivalent Width in Lyman Alpha
Galaxies: The equivalent width (EW) of the Lyman Alpha (Lya) line is directly related
to the ratio of star formation rates determined from Lya flux and UV flux
density [SFR(Lya)/SFR(UV)]. We use published data --in the literature EW and
SFR(Lya)/SFR(U... | astro-ph_CO |
The nature of gas and stars in the circumnuclear regions of AGN: a
chemical approach: Aim of this communication is to describe the first results of a
work-in-progress regarding the chemical properties of gas and stars in the
circumnuclear regions of nearby galaxies. Different techniques have been
employed to estimate... | astro-ph_CO |
CANDELS: Constraining the AGN-Merger Connection with Host Morphologies
at z~2: Using HST/WFC3 imaging taken as part of the Cosmic Assembly Near-infrared
Deep Extragalactic Legacy Survey (CANDELS), we examine the role that major
galaxy mergers play in triggering active galactic nuclei (AGN) activity at z~2.
Our sample... | astro-ph_CO |
Rapid-response mode VLT/UVES spectroscopy of super iron-rich gas exposed
to GRB 080310. Evidence of ionization in action and episodic star formation
in the host: We analyse high-resolution near-UV and optical spectra of the afterglow of
GRB 080310, obtained with the Very Large Telescope Ultraviolet and Visual
Echel... | astro-ph_CO |
The Origin of Dark Matter Halo Profiles: A longstanding puzzle of fundamental importance in modern cosmology has been
the origin of the nearly universal density profiles of dark matter halos found
in N-body simulations -- the so-called NFW profile. We show how this behavior
may be understood, simply, by applying adiaba... | astro-ph_CO |
A Spectroscopic Search for Leaking Lyman Continuum at z~0.7: We present the results of rest-frame, UV slitless spectroscopic observations
of a sample of 32 z~0.7 Lyman break galaxy (LBG) analogs in the COSMOS field.
The spectroscopic search was performed with the Solar Blind Channel (SBC) on
Hubble Space Telescope. We ... | astro-ph_CO |
21 cm Intensity Mapping with the DSA-2000: Line intensity mapping is a promising probe of the universe's large-scale
structure. We explore the sensitivity of the DSA-2000, a forthcoming array
consisting of over 2000 dishes, to the statistical power spectrum of neutral
hydrogen's 21 cm emission line. These measurements ... | astro-ph_CO |
The strong environmental dependence of black hole scaling relations: We investigate how the scaling relations between central black hole mass
(Mbh) and host galaxy properties (velocity dispersion, bulge stellar mass and
bulge luminosity) depend on the large scale environment. For each of a sample
of 69 galaxies with dy... | astro-ph_CO |
Probing the Early Universe with Axion Physics and Gravitational Waves: We show results for the expected reach of the network of experiments that is
being set up globally with the aim of detecting the "invisible" axion, in light
of a non-standard thermal history of the universe. Assuming that the axion is
the dark matte... | astro-ph_CO |
Hubble flow variations as a test for inhomogeneous cosmology: Context. Backreactions from large-scale inhomogeneities may provide an
elegant explanation for the observed accelerated expansion of the universe
without the need to introduce dark energy. Aims. We propose a cosmological test
for a specific model of inhomoge... | astro-ph_CO |
Growth of structures using redshift space distortion in $f(T)$ Cosmology: Cosmology faces a pressing challenge with the Hubble constant ($H_0$)
tension, where the locally measured rate of the Universe's expansion does not
align with predictions from the cosmic microwave background (CMB) calibrated
with $\Lambda$CDM mod... | astro-ph_CO |
What is the super-sample covariance? A fresh perspective for
second-order shear statistics: Cosmological analyses of second-order weak lensing statistics require precise
and accurate covariance estimates. These covariances are impacted by two
sometimes neglected terms: A negative contribution to the Gaussian covarian... | astro-ph_CO |
CMB distortion anisotropies due to the decay of primordial magnetic
fields: We investigate the power spectrum of the distortion of Cosmic Microwave
Background (CMB) due to the decay of the primordial magnetic fields. It is
known that there are two-types of the CMB distortions, so-called \mu- and
y-types and we find t... | astro-ph_CO |
Suppression of Star Formation in the central 200 kpc of a z = 1.4 Galaxy
Cluster [Erratum added]: We present the results of an extended narrow-band H{\alpha} study of the
massive galaxy cluster XMMU J2235.3-2557 at z = 1.39. This paper represents a
follow up study to our previous investigation of star-formation in th... | astro-ph_CO |
A common colour-magnitude relation from giant elliptical galaxies to
globular clusters?: We discuss the existence of a common colour-magnitude relation (CMR) of
metal-poor globular clusters and early-type galaxies, i.e. giant ellipticals,
normal ellipticals and lenticulars, dwarf ellipticals and lenticulars, and
dwar... | astro-ph_CO |
Application of the iterative reconstruction to simulated galaxy fields: We apply an iterative reconstruction method to galaxy mocks in redshift space
obtained from $N$-body simulations. Comparing the two-point correlation
functions for the reconstructed density field, we find that although the
performance is limited by... | astro-ph_CO |
Cosmic Dawn: Studies of the Earliest Galaxies and Their Role in Cosmic
Reionization: I review recent progress and challenges in studies of the earliest galaxies,
seen when the Universe was less than 1 billion years old. Can they be used as
reliable tracers of the physics of cosmic reionization thereby complementing
o... | astro-ph_CO |
A candle in the wind: a radio filament in the core of the A3562 galaxy
cluster: Using a MeerKAT observation of the galaxy cluster A3562 (a member of the
Shapley Supercluster), we have discovered a narrow, long and straight, very
faint radio filament, which branches out at a straight angle from the tail of a
radio gal... | astro-ph_CO |
Cosmological distances with general-relativistic ray tracing: framework
and comparison to cosmographic predictions: In this work we present the first results from a new ray-tracing tool to
calculate cosmological distances in the context of fully nonlinear general
relativity. We use this tool to study the ability of t... | astro-ph_CO |
Proper Size of the Visible Universe in FRW Metrics with Constant
Spacetime Curvature: In this paper, we continue to examine the fundamental basis for the
Friedmann-Robertson-Walker (FRW) metric and its application to cosmology,
specifically addressing the question: What is the proper size of the visible
universe? The... | astro-ph_CO |
A Search for Magnetized Quark Nuggets (MQNs), a Candidate for Dark
Matter, Accumulating in Iron Ore: A search has been carried out for Magnetized Quark Nuggets (MQNs)
accumulating in iron ore over geologic time. MQNs, which are theoretically
consistent with the Standard Models of Physics and of Cosmology, have been
s... | astro-ph_CO |
Neutrino masses from CMB B-mode polarization and cosmic growth rate: Constraints on neutrino masses are estimated based on future observations of
the cosmic microwave background (CMB), which includes the B-mode polarization
produced by CMB lensing from the Planck satellite, and the growth rate of
cosmic structure from ... | astro-ph_CO |
Lensing convergence in galaxy clustering in LambdaCDM and beyond: We study the impact of neglecting lensing magnification in galaxy clustering
analyses for future galaxy surveys, considering the LambdaCDM model and two
extensions: massive neutrinos and modifications of General Relativity. Our
study focuses on the biase... | astro-ph_CO |
Reconstructing the dark energy potential: Dark energy equation of state can be effectively described by that of a
barotropic fluid. The barotropic fluid model describes the background evolution
and the functional form of the equation of state parameter is well constrained
by the observations. Equally viable explanation... | astro-ph_CO |
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