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
- the RBS sequence number (e.g. #1 - #2072)
- the entry in the 1RXS-catalogue (e.g. 1RXS J000312.3-355541)
- an alternate name (e.g. Abell 2717)
- the coordinates in the format: ra(hrs) ra(min) ra(sec) +/-dec(hrs) dec(min) dec(sec)
(e.g. 00 03 15.3 -35 57 18)
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:
- Ra(2000): The optical right ascension for euqinox J2000
- Dec(2000): The optical declination for equinox J2000
- Distance: The distance between the optical and the X-ray coordinate in arcsec
- Err: The X-ray positional uncertainty
- 0.1-2.4 keV countrate
- 0.5-2.0 keV countrate
- 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 X-ray source in 1020 cm-2
- Redshift: The redshift of the X-ray source
- Optical Mag: The optical magnitude of the X-ray source
- X-ray flux: The X-ray flux in the 0.5-2.0 keV
- log(Fxo): log FX/Fo, where FX is the flux in the 0.5-2.0 keV band and Fo the optical flux.
- X-ray luminosity: The log of the X-ray luminosity
up/down: Choose the sorting order. # of hits to display: Choose the number of objects to be displayed.
#: 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 |