RBS - ROSAT Bright Survey (Schwope et al. 2000)
RBS0321: Printed version lists only the F3IV/V star, Fleming identified the WD as companion and likely X-ray ID (XID) RBS0408: Redshift changed from 0.703 to 0.0701 (a typo discovered by A. Edge) RBS1307: New observation: type now Sy1 (instead of Sy), redshift now 0.171 (instead of 0.176) RBS1547: AG Dra now correctly identified as symbiotic binary RBS1705: Printed version lists only a star of spectral type F8; the soft X-ray spectrum suggests an undetected white dwarf as XID RBS1818: The optical position has been changed to 22 04 17.5, -42 58 14, according to Beuermann et al. 1999 Further comments: RBS88: Grupe discovered the transient nature of the X-ray activity of this Sy-galaxy RBS1846: Grupe discovered the transient nature of the X-ray activity of this Sy-galaxy
A running sequence number for sources in the RBS Catalog.
The 1RXS Source Name for the X-ray source based on its J2000 position.
The right ascension of the X-ray source, derived from its 1RXS name where it is given to a precision of 0.1 seconds of time, in the requested equinox.
The declination of the X-ray source, derived from its 1RXS name where it is given to a precision of 1 arcseconds, in the requested equinox.
The right ascension of the optical counterpart to the X-ray source, in J2000 equinox and sexagesimal format.
The declination of the optical counterpart to the X-ray source, in J2000 equinox and sexagesimal format.
The Galactic longitude of the X-ray source.
The Galactic latitude of the X-ray source.
The angular offset between the X-ray source and its optical counterpart, in arcsec.
The one-sigma X-ray positional uncertainty, in arcsec, as given in the 1RXS Catalog. The 90% confidence error radius is 1.65 times sigma, notice.
The RASS count rate in the total ROSAT PSPC bandpass (0.1 - 2.4 keV), in ct/s.
The RASS count rate in the hard ROSAT PSPC bandpass (0.5 - 2.0 keV), in ct/s.
The hardness ratio HR1 = (H-S)/(H+S), where H and S are the counts in the hard (0.5-2.0 keV) and soft (0.1-0.4 keV) spectral bands, respectively.
The hardness ratio HR2 = (H2-H1)/(H1+H2), where H1 and H2 are the count rates in the 0.5-0.9 keV and 0.9-2.0 keV spectral bands, respectively.
The Galactic hydrogen column density, inferred from 21-cm measurements, in units of 1020 atoms/cm2.
The name of the optical counterpart, truncated to 10 characters if longer than 10 characters.
The broad class of the optical counterpart, according to the scheme below (note that a colon indicates an uncertain id). Plausible IDs based on SIMBAD or NED entered this table essentially without further checking in the original literature. If the broad class or source type of a specific source seemed questionable to the authors based on its specific properties, e.g., an unusual high X-ray flux or X-ray extent, it entered their spectroscopic identification program.
Broad Class Explanation AGN Active Galactic Nucleus, X-rays originate from the central engine GALAX Normal galaxy without any obvious nuclear activity. X-rays originate predominantly from the stellar constituents of the galaxy CLUST Cluster of galaxies GGRP Small (compact) group of galaxies STAR Coronal or photospheric emitter of X-rays CV Cataclysmic variable or related object (white dwarf accretor) XRB X-ray binary (neutron star or black hole accretor) MC Magellanic Cloud source, not considered in the identification program VIRGO X-ray source in the Virgo region, not considered in the identification program
For some broad classes, this parameter is used to indicate a specific subtype of object, according to the scheme below (note that a colon indicates an uncertain id). Plausible IDs based on SIMBAD or NED entered this table essentially without further checking in the original literature. If the broad class or source type of a specific source seemed questionable to the authors based on its specific properties, e.g., an unusual high X-ray flux or X-ray extent, it entered their spectroscopic identification program.
Broad Class Possible Source_types AGN QSO (Quasi-Stellar Object), BLL or BL (BL Lac object), SY1...2 (Seyfert Galaxy of subtype 1...2), NLS1 (Narrow-Line Seyfert 1 Galaxy), LINER, XTG (X-ray Transient Galaxy), NELG (Narrow Emission-Line Galaxy), SRB (Starburst Galaxy) GALAX Hubble type STAR PN (Planetary Nebula), spectral type (for coronal emitters and hot stars), WD (White Dwarf), INS (Isolated Neutron Star) CV AM (Am Her star or polar), IP (Intermediate Polar), DN (Dwarf Nova), NL (Nova-like variable), SSS (SuperSoft Source), SYMB (Symbiotic binary) XRB HMXB or HXB (High-Mass X-ray Binary), LMXB (Low-Mass X-ray Binary), XRT (X-Ray Transient)
The redshift of the optical counterpart to the X-ray source, if extragalactic.
A flag that is set to ':' if the redshift value is uncertain or '>' if the redshift value is a lower limit.
The apparent optical magnitude of the optical counterpart to the X-ray source.
A flag that can have the following values, mostly indicative of the information source for the optical magnitude:
Value Explanation : uncertain > lower limit C CDS/SIMBAD V-band D CDS/SIMBAD B-band N NED magnitude in the optical range R Red (E) magnitude from APM/ROE scan of POSS/ESO/SERC plate B Blue (O) magnitude from APM/ROE scan of POSS/ESO/SERC plate S Below slit magnitude determined by folding a low-resolution spectrum with the sensitivity curve of a V-filter
The X-ray flux in the 0.5 - 2.0 keV range, in units of erg/s/cm2. Assuming a power-law spectrum with a photon index of 2, a count-to-energy conversion factor or ECF for the ROSAT PSPC was computed for the given Galactic column density NH towards the X-ray source. The flux was then computed using the count rate in the hard band (hard_count_rate) where flux = hard_count_rate/ECF. This approach yields unreliable and inconsistent results for sources with HR1 smaller than -0.4, as even an unabsorbed power law cannot be softer than this limit.
The logarithm of the ratio of the X-ray and optical fluxes.
The logarithm of the X-ray luminosity, in erg/s, for extragalactic sources, calculated using:
Lx = 4 pi * flux * (c * redshift / H0)2and an assumed value of the Hubble Constant H0 of 50 km/s/Mpc.
This is a flag that is set to 'Y' if there is a comment about the particular source at the end of Table 2 in the published version of the RBS Catalog (q.v.).
The Browse classification for the source, derived from the broad_class and source_type parameter values.