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2000ApJS..........Bauer+ (in press)

astro-ph/0003002

RBSC-NVSS SAMPLE. I. RADIO AND OPTICAL IDENTIFICATIONS OF A COMPLETE SAMPLE OF 1500 BRIGHT X-RAY SOURCES

Franz E. Bauer E-mail: fbauer@nrao.edu
J.J. Condon E-mail: jcondon@nrao.edu
Trinh X. Thuan E-mail: txt@virginia.edu
J.J. Broderick E-mail: jjb@vt.edu
Abstract
We cross-identified the ROSAT Bright Source Catalog (RBSC) and the NRAO VLA Sky Survey (NVSS) to construct the RBSC-NVSS sample of the brightest X-ray sources (~0.1 counts s^{-1} ~= 10^{-12} ergs cm^-2s^-1 in the 0.1--2.4 keV band) that are also radio sources (S ~= 2.5 mJy at 1.4 GHz) in the 7.8 sr of extragalactic sky with |b| > 15deg and DEC > -40deg. The sky density of NVSS sources is low enough that they can be reliably identified with RBSC sources having rms positional uncertainties ~10''. We used the more accurate radio positions to make reliable X-ray/radio/optical identifications down to the POSS plate limits. We obtained optical spectra for many of the bright identifications lacking published redshifts. The resulting X-ray/radio sample is unique in its size (N ~ 1500 objects), composition (a mixture of nearly normal galaxies, Seyfert galaxies, quasars, and clusters), and low average redshift ( z ~ 0.1). 
keywords:  catalogs --- radio continuum: general --- surveys ---
	   X-rays: general

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The remaining 1512 objects are extragalactic and listed in Table2.

Column 1.  ROSAT RBSC name, format 1RXS JHHMMSS.S+DDMMSS.
Column 2.  NED Common Name, if available.
Column 3.  ROSAT BSC X-ray Flux.
Column 4.  NVSS position, unless noted otherwise.
Column 5.  NVSS 1.4 GHz Flux density.
Column 6.  Identification Probability P(R,V)
	   (Equation. Identifications with a '-' have been
	   accepted despite having a low probability.
Column 7.  B magnitude from NED, if available;
	   otherwise from USNO as indicated by '()'. Identifications with a
	    '-' denote empty fields.
Column 8.  Redshift, if known. From NED unless noted otherwise.
	   Identifications with a '-' represent objects for which
	   spectra was taken but a redshift could not be determined. We
	   have obtained optical spectra with
	   the KPNO 2.1 m telescope for many of the bright identifications
	   which did not possess published redshifts. The detailed description
	   of these spectra will be given in a subsequent paper
	   (Bauer, Thuan, Condon 2000).
Column 9.  NED optical morphology, if available.
Column 10. Spectral classification, if known. From NED unless noted otherwise
	   in redshift column.
------------------------------------------------------------------------
AGN      Active galactic nuclei, type unknown
Blazar   BL Lacertae type object with variable emission line spectra
BLLAC    BL Lacertae type object
BLRG     Broad-line radio galaxy
cD       Central dominant galaxy, Early-type stellar absorption continuum
Early    Early-type stellar absorption continuum
HII      Starburst galaxy with narrow emission-line spectra similar
	 to HII regions
HPQ      High polarization QSO
LINER    Low ionization narrow emission-line region
LPQ      Low polarization QSO
QSO      Quasi-stellar object
Sy1-2    Seyfert galaxy, emission-line spectra classified from type 1 to 2

------------------------------------------------------------------
   Notes:
   O - Optical position given: because identification is more than 3sigma
       from radio position or there are multiple optical candidates
   R - NVSS position and/or flux density remeasured.
   F - High resolution position and flux density taken from the FIRST 1.4 GHz
       survey (White et al. 1997).
   S - Extended radio emission - central point source and single lobe;
       using central point source position and total emission.
   E - Extended radio emission.
   D - Extended radio emission - double; using centroid and total emission.
   T - Extended radio emission - triple; using central source position and
       total emission.
   1 - Derived from optical spectra obtained with KPNO 2.1m telescope during
       1997$-$1999. A dash (-) indicates there is not enough spectral
       information to classify
   2 - From Brinkmann et al. 2000

transform from  TeX ver. by Trushkin (for CATS database)  05/03/2000
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ROSAT  BSC        NED                          S_x              Position             S_1.4 GHz  ID   |------------------ NED ---------------------|
 1RXS name        Common name             ergs s^-1cm^-2    RA  J2000  DEC           mJy        P     m_B    Redshift    Morphology      Sp. Class.
----------------------------------------------------------------------------------------------------------------------------------------------------
J000000.0-392902  ESP 21616                 1.61e-12 23 59 56.35 -39 28 46.3 O        3.3     0.25    19.0
		  ESP 21615                          23 59 56.68 -39 28 37.2 O        3.3     0.34    18.9
J000007.0+081653  UGC 12890                 5.98e-12 00 00 06.98 +08 16 46.3         83.5     1.00    16.0    0.0387  1                   Early
J000226.6+032105  NGC 7811                  5.84e-12 00 02 25.94 +03 21 02.7          5.8     1.00    15.1    0.0255      cIm?            Sy1