UNIONS-VLASS Radio Galaxy Catalog

The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) - Very Large Array Sky Survey (VLASS) radio galaxy catalog

Datasets included:

 Dataset

 Bands
 Website
 VizieR

 UNIONS

 CFHT:u + r; Subaru: g + z; Pan-STARRS: i
 https://www.skysurvey.cc/

 VLASS Epoch 2

 VLA, 3 GHz
 https://cirada.ca/vlasscatalogueql0

 FIRST

 VLA, 1.4 GHz
 https://sundog.stsci.edu/
 VIII/92/first14

 RACS-mid

 ASKAP, 1.4 GHz
 https://research.csiro.au/racs/home/data-2/racs-  mid1-dr2/

 LoTSS DR2

 LOFAR, 144 MHz
 https://lofar-surveys.org/dr2_release.html

 SDSS DR16

 ugriz
 https://www.sdss4.org/dr16/
 V/154/sdss16

 Pan-STARRS

 grizy
 https://outerspace.stsci.edu/display/PANSTARRS/
 II/349/ps1

 AllWISE
 3.4, 4.6, 12, and 22 micron
 https://wise2.ipac.caltech.edu/docs/release/allwise/
 II/328/allwise

 unWISE
 3.4 and 4.6 micron
 https://unwise.me/
 II/363/unwise

Users are encouraged to check VizieR for AllWISE, unWISE, SDSS, and Pan-STARRS for full column information and descriptions.

Supplemented columns:

sep_{survey1}_{survey2}

arcsec
angular separations of each pair of radio surveys and UNIONS

alpha_{survey1}_{survey2}

spectral index and the corresponding errors of each pair of radio surveys

r_obs

observed radio loudness

luminosity_{frequency}
W/Hz
radio spectral luminosity at a certain frequency

mag_{survey}
mag
radio AB magnitudes [mag] for VLASS and FIRST

ls_{survey}
kpc
projected linear size [kpc] of VLASS and LoTSS

flag_z_photo

reliability of UNIONS photo-z

Z_B_ref

preferred UNIONS redshifts

Z_ref

preferred redshifts

extended

flag of an extended radio source

flag_multi_opt

flag of multiple optical counterparts

The calculations and details of these columns are described in Section 3 and Table 3 in Zhong et al. 2025, ApJS (https://iopscience.iop.org/article/10.3847/1538-4365/ae03c3).