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pgc
int64
2
9M
pgc_primary
int64
12
9M
morphological_type
float64
1
88.4k
velocity_cmb
int64
-784
32.6k
distance_modulus
float64
18.5
39.5
distance_modulus_err
float64
0.01
2.11
dm_sn_ia
float64
28.1
38.4
dm_sn_ia_err
float64
0.07
1.28
dm_tully_fisher
float64
26.1
38.5
dm_tully_fisher_err
float64
0.38
0.8
dm_fundamental_plane
float64
29.5
39.5
dm_fundamental_plane_err
float64
0.42
2.11
dm_surface_brightness
float64
23.8
34.9
dm_surface_brightness_err
float64
0.04
1.22
dm_sn_ii
float64
28.2
38.1
dm_sn_ii_err
float64
0.33
1.02
dm_trgb
float64
21.9
31.7
dm_trgb_err
float64
0.01
1.22
dm_cepheid
float64
18.5
34.5
dm_cepheid_err
float64
0.02
0.25
dm_maser
float64
29.4
35.6
dm_maser_err
float64
0.03
0.56
ra_deg
float64
0.01
360
dec_deg
float64
-89.33
88.1
glon_deg
float64
0.03
360
glat_deg
float64
-89.49
89.8
sgl_deg
float64
0.33
360
sgb_deg
float64
-88.76
87
in_cf3
bool
2 classes
distance_mpc
float64
0.05
804
2
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End of preview. Expand in Data Studio

Cosmicflows-4 Galaxy Distances

Part of the Astronomy Datasets collection on Hugging Face.

The Cosmicflows-4 (CF4) catalog is the most comprehensive compilation of galaxy distances ever assembled. Published by Tully et al. (2023), it contains 55,877 distance measurements derived from eight independent methods, enabling studies of the cosmic distance ladder, large-scale structure, and peculiar velocities of galaxies.

Dataset description

Galaxy distances are fundamental to cosmology. Unlike redshifts, which mix Hubble flow with peculiar velocities, direct distance measurements let us map the true 3D distribution of matter. CF4 consolidates distances from Type Ia supernovae, the Tully-Fisher relation, the fundamental plane, tip of the red giant branch (TRGB), Cepheid period-luminosity, surface brightness fluctuations (SBF), Type II supernovae, and maser observations.

Each entry includes the PGC galaxy identifier, coordinates (equatorial, galactic, supergalactic), CMB-frame velocity, a best-estimate distance modulus, and individual distance moduli from each method where available.

Schema

Column Type Description
pgc int PGC galaxy number
pgc_primary int Primary PGC number (for grouped galaxies)
morphological_type float Morphological type code (de Vaucouleurs T)
velocity_cmb float Velocity in CMB frame (km/s)
distance_modulus float Best-estimate distance modulus (mag)
distance_modulus_err float Uncertainty on distance modulus (mag)
distance_mpc float Distance in Mpc (derived from distance modulus)
dm_sn_ia float Distance modulus from Type Ia supernovae
dm_sn_ia_err float Uncertainty on SNe Ia distance modulus
dm_tully_fisher float Distance modulus from Tully-Fisher relation
dm_tully_fisher_err float Uncertainty on Tully-Fisher distance modulus
dm_fundamental_plane float Distance modulus from fundamental plane
dm_fundamental_plane_err float Uncertainty on fundamental plane DM
dm_surface_brightness float Distance modulus from surface brightness fluctuations
dm_surface_brightness_err float Uncertainty on SBF distance modulus
dm_sn_ii float Distance modulus from Type II supernovae
dm_sn_ii_err float Uncertainty on SNe II distance modulus
dm_trgb float Distance modulus from tip of red giant branch
dm_trgb_err float Uncertainty on TRGB distance modulus
dm_cepheid float Distance modulus from Cepheid variables
dm_cepheid_err float Uncertainty on Cepheid distance modulus
dm_maser float Distance modulus from maser observations
dm_maser_err float Uncertainty on maser distance modulus
ra_deg float Right ascension J2000 (degrees)
dec_deg float Declination J2000 (degrees)
glon_deg float Galactic longitude (degrees)
glat_deg float Galactic latitude (degrees)
sgl_deg float Supergalactic longitude (degrees)
sgb_deg float Supergalactic latitude (degrees)
in_cf3 bool Present in Cosmicflows-3 catalog

Quick stats

  • 55,877 galaxy distance measurements
  • 12,222 with Tully-Fisher distances
  • 42,223 with fundamental plane distances
  • 1,004 with Type Ia supernova distances
  • 446 with TRGB distances
  • 69 with Cepheid distances
  • 15,839 also in Cosmicflows-3
  • Median distance: 203.8 Mpc

Usage

from datasets import load_dataset

ds = load_dataset("juliensimon/cosmicflows-galaxy-distances", split="train")
df = ds.to_pandas()

# Galaxies within 100 Mpc (local universe)
local = df[df["distance_mpc"] <= 100]
print(f"{len(local):,} galaxies within 100 Mpc")

# Galaxies with Cepheid-calibrated distances
cepheids = df[df["dm_cepheid"].notna()]
print(f"{len(cepheids):,} with Cepheid distances")

# Sky distribution in supergalactic coordinates
import matplotlib.pyplot as plt
plt.scatter(df["sgl_deg"], df["sgb_deg"], s=0.2, alpha=0.3, c=df["distance_mpc"],
            cmap="viridis", vmax=200)
plt.colorbar(label="Distance (Mpc)")
plt.xlabel("Supergalactic Longitude")
plt.ylabel("Supergalactic Latitude")
plt.title("Cosmicflows-4: Galaxy Distance Map")

Data source

Cosmicflows-4 (Tully R.B., Kourkchi E., Courtois H.M., et al., 2023, ApJ, 944, 94), accessed via VizieR, CDS Strasbourg.

Update schedule

Static dataset (fixed catalog release). No scheduled updates.

Related datasets

Pipeline

Source code: juliensimon/space-datasets

Citation

@dataset{cosmicflows_galaxy_distances,
  author = {Simon, Julien},
  title = {Cosmicflows-4 Galaxy Distances},
  year = {2026},
  publisher = {Hugging Face},
  url = {https://huggingface.co/datasets/juliensimon/cosmicflows-galaxy-distances},
  note = {Based on Cosmicflows-4 (Tully et al. 2023, ApJ, 944, 94) via VizieR CDS Strasbourg}
}

License

CC-BY-4.0

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