Search Description
Enter an RBS catalogue number, identifier, coordinate:
As an identifier please enter one of the following:

Define a radius:
Enter either the radius (deg) of objects around the target to be displayed or the number (next#) of 
following ROSAT Bright Survey Catalogue objects. Class of objects: Choose either all classes of objects to be displayed in the output (default) or select a
single class. Sort for: Choose the order of the query output by sorting for one of the following:

up/down: Choose the sorting order. # of hits to display: Choose the number of objects to be displayed.

Table Description

#:
The RBS sequence number

IMG:
Click on the marked RBS sequence number for finding charts and spectra.

1RXS J...:
The entry in the 1RXS-catalogue (X-ray coordinates for equinox J2000)

RASS:
Click on the 1RXS-catalogue entry of a source links to the ROSAT Source Browser entry of the 
given object. RA(2000): The optical right ascension for euqinox J2000 SIMBAD: Click on the optical right ascension of a source links to the SIMBAD Astronomical Database entry
of the given object. DEC(2000): The optical declination for the X-ray source for equinox J2000 NED: Click on the optical declination of a source links to the NASA/IPAC Extragalactic Database entry
of the given object. SDSS: Click on the countrate a source links to the SDSS-DR12 entry of the given object. DIST: The distance between the optical and the X-ray coordinate in arcsec ERR: The X-ray positional uncertainty (1 sigma) in arcsec as given in the 1RXS-catalogue. The 90%
confidence error radius is r90 = 1.65 sigma. CR: The RASS countrate in the total ROSAT window 0.1-2.4 keV CRH: The Rass countrate in the hard ROSAT window 0.5-2.0 keV HR1: The hardness ratio HR1=(H+S)/(H-S), with H and S being the counts in the hard (0.5-2.0 keV) and
the soft (0.1-0.4 keV) spectral bands, respectively. HR2: The hardness ratio HR2=(H+S)/(H-S), with H and S being the counts in the hard
(0.9-2.0 keV) and the soft (0.52-0.9 keV) spectral bands, respectively. NH: The hydrogen column density towards the source in 1020 cm-2 Name: An alternate name of the source (for sources with catalogue entries others than RBS), truncated
to 15 characters Class and Type: The class and the type of the X-ray source with the following abbreviations (a colon indicates
an uncertain identification):
Class Explanation Type
AGN active galactic nucleus, X-rays originate from the central engine QSO, BLL (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 normal galaxy without obvious nuclear activity. X-rays
originate predominantly from the stellar constituents of the galaxy
Hubble type
CLUST cluster of galaxies no further division
GGRP small (compact) group of galaxies no further division
STAR coronal or photospheric emitter of X-rays PN (planetary nebula), spectral type (for coronal emitters and hot stars),
WD (white dwarf), INS (isolated neutron star)
CV cataclysmic variable or related object (white dwarf accretor) AM (AM Herculis star or polar), IP (intermediate polar), DN (dwarf nova),
NL (novalike variable), SSS (supersoft source), Symb (symbiotic binary)
XRB X-ray binary (neutron star or black hole accretor) HMXB (high-mass X-ray binary), LMXB (low-mass X_ray binary),
XRT (X-ray transient)
MC Magellanic cloud source, not considered in the identification program  

Plausible identifications based on NED or SIMBAD correlation entered the table without checking 
the original literature. If class or type of a specific source seemed questionable for its
specific properties (e.g. unusual high X-ray flux or X-ray extent), it entered our spectroscopic
identification program.

z: The redshift of the X-ray source (if extragalactic), a colon indicates an uncertain value Mag: An optical magnitude of the X-ray source, a colon indicates an uncertain value. The character
behind the value identifies the source of information: C - CDS/SIMBAD (V-band), D - CDS/SIMBAD
(B-Band), N - NED (a magnitude in the optical range), R - APM/ROE scan of POSS/ESO/SERC red (E)
plate, B - APM/ROE scan of POSS/ESO/SERC blue (O) plate, S - below slit magnitude determined by
folding a low-resolution spectrum with the sensitivity curve of a V-filter, G - SDSS 12 (G-band, 468.6 nm). Flux: The X-ray flux in the 0.5-2.0 keV range in units of 10-14 erg cm-2 s-1. Assuming a power law
spectrum with photon index 2 a count-to-energy conversion factor ECF for the ROSAT PSPC was
computed for given column density towards the X_ray source (galactic NH assumed). The flux was
then computed using the countrate in the hard band (column 8) via fx = CRH/ECF. This approach
yields unreliable and inconsistent results for sources with HR1 smaller than -0.4, even an
unabsorbed power law cannot be softer than this limit. log(Fxo): The log of FX/Fo, where FX is the flux in the 0.5-2.0 keV band and Fo the optical flux. Lx: The log of the X-ray luminosity in ergs/s computed as Lx = 4 pifx(cz/H0)2, with H0=50 km s-1 Mpc-1. Note: The "Y" indicates a note or comment to the source somtimes using shortcuts which are explained in the table below.

Note Explanation
GC galaxy cluster
CCC cool core cluster
BS binary system
CO possible contribution from other nearby sources
GLS gravitational lense system
PM proper motion
RPVS rotational periodic variable star
EB eclipsing binary


This page is maintained by Axel Schwope (aschwope@aip.de).
last edited: July 24, 2015