RASS6DFGS ivo://nasa.heasarc/rass6dfgs NASA/GSFC HEASARC Mahony et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a catalog of 3405 X-ray sources from the ROSAT All Sky Survey (RASS) Bright Source Catalog which fall within the area covered by the 6dF Galaxy Survey (6dFGS). The catalog is count-rate limited at 0.05 ct s<sup>-1</sup> in the X-ray and covers the area of sky with Declination < 0 degrees and |b| > 10 degrees. The RASS-6dFGS sample was one of the additional target catalogs of the 6dFGS and as a result the authors obtained optical spectra for 2224 (65 per cent) RASS sources. Of these, 1715 (77%) have reliable redshifts with a median redshift of z = 0.16 (excluding the Galactic sources). For the optically bright sources (b_J <= 17.5) in the observed sample, over 90% have reliable redshifts. The catalog mainly comprises quasi-stellar objects (QSOs) and active galaxies but also includes 238 Galactic sources. Of the sources with reliable redshifts, the majority are type 1 active galactic nuclei (AGN, 69%), while 12% are type 2 AGN, 6% absorption-line galaxies and 13% are stars. The authors also identify a small number of optically faint, very low redshift, compact objects which fall outside the general trend in the b_J - z plane. The RASS-6dFGS catalog complements a number of Northern hemisphere samples, particularly the ROSAT Bright Source Catalogue-NRAO VLA Sky Survey (RBSC-NVSS) sample (Bauer et al. 2000, ApJS, 129, 547), and furthermore, in the same region of sky (-40 degrees < Declination < 0 degrees) reveals an additional 561 sources that were not identified as part of that sample. The authors detect 918 sources (27%) of the RASS-6dFGS sample in the radio using either the 1.4 GHz NVSS or the 843 MHz Sydney University Molonglo Sky Survey (SUMSS) catalogues and find that the detection rate changes with redshift. At redshifts larger than 1 virtually all of these sources have radio counterparts and with a median flux density of 1.15 Jy, they are much stronger than the median flux density of 28.6 mJy for the full sample. The authors attribute this to the fact that the X-ray flux of these objects is being boosted by a jet component, possibly Doppler boosted, that is only present in radio-loud AGN. The RASS-6dFGS sample provides a large set of homogeneous optical spectra ideal for future studies of X-ray emitting AGN. This table was created by the HEASARC in April 2010 based on an electronic version of Table 3 from the reference paper obtained from the MNRAS web site. This is a service provided by NASA HEASARC . 2010MNRAS.401.1151M https://heasarc.gsfc.nasa.gov/W3Browse/all/rass6dfgs.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rass6dfgs& GET text/xml 180 99999 true 105.53145833 -86.72941667 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rass6dfgs GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rass6dfgs&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0166666666666667 Optical Radio X-ray public rass6dfgs ROSAT All-Sky Survey/6dF Galaxy Survey Catalog of X-Ray Selected name Catalog Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable rmag R Magnitude from the USNO Database mag phot.mag;em.opt.R double nullable rass_name RASS Source Designation of form 1RXS JHHMMSS.S-DDMMSS meta.id.cross char nullable rass_count_rate RASS X-Ray Count Rate (ct/s) ct/s phot.count;em.X-ray.soft double nullable rass_count_rate_error RASS X-Ray Count Rate Uncertainty (ct/s) ct/s stat.error;phot.count;em.X-ray.soft double nullable rass_flux RASS X-Ray Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable rass_flux_error RASS X-Ray Flux Uncertainty (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable bii Galactic Latitude degree pos.galactic.lat double nullable redshift Redshift from the 6dFGS src.redshift double nullable redshift_quality_flag Redshift Quality Flag from the 6dFGSz meta.code.qual;src.redshift short nullable lii Galactic Longitude degree pos.galactic.lon double nullable bibcode_ned_redshift Bibcode for the NED Redshift meta.bib.bibcode;src.redshift char nullable extended_flag Extended Flag for X-Ray Source meta.code;phys.angSize char nullable flux_36_cm SUMSS Flux Density (mJy) mJy phot.flux.density;em.radio.750-1500MHz double nullable bj_mag b_J Magnitude from the USNO Database mag phot.mag;em.opt.B double nullable flux_20_cm NVSS Flux Density (mJy) mJy phot.flux.density;em.radio.750-1500MHz double nullable nh_gal Galactic Hydrogen Column Density (cm^-2) H-atoms/cm^2 phys.columnDensity double nullable class Browse Object Classification src.class short nullable ned_redshift Redshift from NED src.redshift double nullable redshift_error Redshift Uncertainty from the 6dFGS stat.error;src.redshift double nullable program_id_6dfgs Program Identification of the 6dFGS Spectrum meta.code;obs short nullable ned_class Classification from NED src.class char nullable ref_ned_redshift Reference for the NED Redshift meta.ref;src.redshift char nullable comments Comments on Features in the 6dFGS Spectrum meta.note 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