UNIONS-VLASS Radio Galaxy Catalog

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

Datasets included:

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/

LoTSS DR2

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

SDSS DR16

ugriz
https://www.sdss4.org/dr16/

Pan-STARRS

grizy
https://outerspace.stsci.edu/display/PANSTARRS/

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

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

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 Table 3 in Zhong et al. (2025, accepted for publication in ApJS; https://arxiv.org/abs/2507.08604).