CCOSRSSFAG ivo://nasa.heasarc/ccosrssfag NASA/GSFC HEASARC Ranalli et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source X-ray surveys contain sizable numbers of star-forming galaxies, beyond the AGN which usually make up the majority of detections. Many methods to separate the two populations are used in the literature, based on X-ray and multi-wavelength properties. The authors aim at a detailed test of the classification schemes and to study the X-ray properties of the resulting samples. They build on a sample of galaxies selected at 1.4 GHz in the VLA-COSMOS survey, classified by Smolcic et al. (2008, ApJS, 177, 14) according to their optical colors and also observed by Chandra. A similarly selected control sample of AGN is also used for comparison. The authors review some X-ray based classification criteria and check how they affect the sample composition. The efficiency of the classification scheme devised by Smolcic et al. (2008) is such that ~30% of composite/misclassified objects are expected because of the higher X-ray brightness of AGN with respect to galaxies. The latter fraction is actually 50% in the X-ray detected sources, while it is expected to be much lower among X-ray undetected sources. Indeed, the analysis of the stacked spectrum of undetected sources shows, consistently, strongly different properties between the AGN and galaxy samples. X-ray based selection criteria are then used to refine both samples. The radio/X-ray luminosity correlation for star-forming (SF) galaxies is found to hold with the same X-ray/radio ratio valid for nearby galaxies. Some evolution of the ratio may be possible for sources at high redshift or high luminosity, though it is likely explained by a bias arising from the radio selection. Finally, in their paper the authors discuss the X-ray number counts of star-forming galaxies from the VLA- and C-COSMOS surveys according to different selection criteria, and compare them to the similar determination from the Chandra Deep Fields. The classification scheme proposed here may find application in future works and surveys. This table contains the catalogs of radio-selected SF- and AGN-candidate sources with an X-ray detection in C-COSMOS which were contained in Tables 2 and 3 of the reference paper, respectively. The HEASARC has merged these into a single table, adding a new parameter sample which is set to 'SFG' for radio-selected SF-candidate sources from Table 2 and to 'AGN' for the AGN-candidate sources from Table 3. This table was created by the HEASARC in June 2012 based on CDS table J/A+A/542/A16 files table2.dat and table3.dat. This is a service provided by NASA HEASARC . 2012A&A...542A..16R https://heasarc.gsfc.nasa.gov/W3Browse/all/ccosrssfag.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ccosrssfag& GET text/xml 180 99999 true 150.37254167 1.60927778 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ccosrssfag GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ccosrssfag&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0166666666666667 X-ray Optical public ccosrssfag Chandra COSMOS Radio-Selected Star-Forming Galaxies and AGN Cata name Source Designation (COSMOSVLA JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char nullable cxo_name Chandra Source Designation (CXOC JHHMMSS.s+DDMMSS) meta.id.cross char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable redshift Spectroscopic Redshift src.redshift double nullable sb_flux_limit Limit Flag for X-Ray Flux in Soft Band meta.code;phot.flux;em.X-ray.soft char nullable sb_flux X-Ray Flux in Soft Band (0.5-2keV) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable hb_flux_limit Limit Flag for X-Ray Flux in Hard Band meta.code;phot.flux;em.X-ray.medium char nullable hb_flux X-Ray Flux in Hard Band (2-10keV) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable hardness_ratio Hardness Ratio (H-S)/(H+S) phot.flux;arith.ratio;em.X-ray double nullable sample Indicates Published Table from Which Entry Originates {SFG=Table 2,AGN=Table 3} meta.ref;meta.table char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable sb_lx_limit Limit Flag for X-Ray Luminosity in Soft Band meta.code;phys.luminosity;em.X-ray.soft char nullable hb_lx_limit Limit Flag for X-Ray Luminosity in Hard Band meta.code;phys.luminosity;em.X-ray.medium char nullable sb_lx X-Ray Luminosity in Soft Band (0.5-2keV) erg/s phys.luminosity;em.X-ray.soft double nullable bii Galactic Latitude degree pos.galactic.lat double nullable xray_opt_ratio_limit Limit Flag for X-Ray/Optical Flux Ratio meta.code;phot.flux;arith.ratio;em.X-ray;em.opt char nullable class Browse Object Classification src.class short nullable xray_radio_ratio X-Ray/Radio Flux Ratio, q=Logarithm(FS/S1.4GHz) log(Hz) phot.flux;arith.ratio;em.X-ray;em.radio double nullable lii Galactic Longitude degree pos.galactic.lon double nullable xray_radio_ratio_limit Limit Flag for X-Ray/Radio Flux Ratio meta.code;phot.flux;arith.ratio;em.X-ray;em.radio char nullable cxo_source_number Chandra Source Identification from Elvis et al. (2009, Cat. J/ApJS/184/158) meta.id;src int nullable xray_opt_ratio X-Ray/Optical Flux Ratio phot.flux;arith.ratio;em.X-ray;em.opt double nullable source_type Optical Classification {T1,T2,E,A,L} src.class char nullable redshift_flag Flag [a] Indicates Photometric Redshift Instead of Spectroscopic meta.code;src.redshift char nullable sfg_agn_class Number [1-3] Indicates Classification According to This Paper src.class short nullable hb_lx X-Ray Luminosity in Hard Band (2-10keV) erg/s phys.luminosity;em.X-ray.medium double nullable