J/MNRAS/489/3403 A new sample of southern radio galaxies (Marubini+, 2019) ================================================================================ A new sample of southern radio galaxies: host-galaxy masses and star-formation rates. Marubini T., Jarvis M.J., Fine S., Mauch T., McAlpine K., Prescott M. =2019MNRAS.489.3403M (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Galaxies, photometry ; Active gal. nuclei ; Redshifts ; Radio sources ; Optical ; Infrared Keywords: galaxies: active - galaxies: star formation - radio continuum: galaxies Abstract: In this study we define a new sample of distant powerful radio galaxies in order to study their host galaxy properties and provide targets for future observations of HI absorption with new radio telescopes and to understand the fuelling and feedback from such sources. We have cross-matched the Sydney University Molonglo Sky Survey (SUMSS) radio catalogue at 843MHz with the VISTA Hemisphere Survey (VHS) near-infrared catalogue using the likelihood ratio technique. Photometric redshifts from the Dark Energy Survey are then used to assign redshifts to the radio source counterparts. We found a total of 249 radio sources with photometric redshifts over a 148deg^2^ region. By fitting the optical and near-infrared photometry with spectral synthesis models we determine the stellar mass and star formation rates of the radio sources, finding typical stellar masses of 10^11^-10^12^M_{sun}_ for the powerful high-redshift radio galaxies. We also find a population of low-mass blue galaxies. However, by comparing the derived star formation rates to the radio luminosity, we suggest that these sources are false positives in our likelihood ratio analysis. Follow-up, higher resolution (~<5arcsec) radio imaging would help alleviate these mid-identifications, as the limiting factor in our cross-identifications is the low resolution (~45arcsec) of the SUMSS radio imaging. Description: In order to create a new sample of powerful radio galaxies in the Southern hemisphere, we first require a parent radio survey which covers enough sky area that it provides a statistically significant number of bright radio sources. The parent radio survey that we use in this study is therefore SUMSS. SUMSS surveyed the sky below {delta}<-30{deg} with |b|>10{deg}, at a frequency of 843MHz using the Molonglo Observatory Synthesis Telescope (MOST; Mills 1981PASA....4..156M). The Visible and Infrared Survey Telescope for Astronomy (VISTA) Hemisphere Survey (VHS) is an NIR photometric survey of the southern sky. It covers 18000deg^2^ with magnitude limits of H=19.8; J=20.6; Ks=18.5 (Vega). The NIR photometric data, which have a resolution of ~1.2arcsec, was accessed via the VISTA Science Archive (http://www-wfau.roe.ac.uk/sss/) and we used the VHS Data Release 3. The DES (Dark Energy Survey Collaboration 2016MNRAS.460.1270D) is an optical survey that will eventually cover 5000deg^2^ in the SGP region in the griz bands, using a dedicated camera (DECam) on the 4m Victor M. Blanco Telescope at the Cerro Tololo Inter-American Observatory (CTIO) in Chile (Flaugher et al. 2015AJ....150..150F). Of the 1195 DES+VHS sources cross-matched to the SUMSS data, we find that 249 have good photometric information that allow the determination of photometric redshifts (see Table 1). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 161 249 The radio galaxy sample overlapping SUMSS+VHS+DES defined in this paper -------------------------------------------------------------------------------- See also: VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008) II/367 : The VISTA Hemisphere Survey (VHS) catalog DR5 (McMahon+, 2020) II/357 : The Dark Energy Survey (DES): Data Release 1 (Abbott+, 2018) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- ID [1/249] Galaxy identifier 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 15 F5.2 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 27 F4.1 arcsec DEs Declination (J2000) 29- 34 F6.3 mag gmag ? DES g-band magnitude 36- 41 F6.4 mag e_gmag ? Error on gmag 43- 48 F6.3 mag rmag ? DES r-band magnitude 50- 55 F6.4 mag e_rmag ? Error on rmag 57- 62 F6.3 mag imag DES i-band magnitude 64- 69 F6.4 mag e_imag Error on imag 71- 76 F6.3 mag zmag DES z-band magnitude 78- 83 F6.4 mag e_zmag Error on zmag 85- 90 F6.3 mag Jmag ? VHS J-band magnitude 92- 96 F5.3 mag e_Jmag ? Error on Jmag 98-103 F6.3 mag Hmag ? VHS H-band magnitude 105-109 F5.3 mag e_Hmag ? Error on Hmag 111-116 F6.3 mag Ksmag VHS Ks-band magnitude 118-122 F5.3 mag e_Ksmag Error on Ksmag 124-129 F6.1 mJy S843 SUMSS flux at 843MHz 131-134 F4.1 mJy e_S843 Error on S843 136-139 F4.2 --- zphot Photometric redshift 141-144 F4.2 --- b_zphot Lower bound on zphot 146-149 F4.2 --- B_zphot Upper bound on zphot 151-155 F5.2 [Msun] logM* Logarithm of stellar mass 157-161 F5.2 [Msun/yr] logSFR Logarithm of star formation rate -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Ana Fiallos [CDS] 13-Jan-2023