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1997AJ....113.2134Oppenheimer+
IX/18          EINSTEIN extended source survey (EXSS)     (Oppenheimer+ 1997)
============================================================================
A survey of the EINSTEIN IPC Database for extended X-ray sources.
     Oppenheimer B.R., Helfand D.J., Gaidos E.J.
     Astron. J. 113, 2134-2146 (1997)
    =1997AJ....113.2134O       (SIMBAD/NED BibCode)
=============================================================================
ADC_Keywords: X-ray sources ; Clusters, galaxy ;
Mission_Name: Einstein

Description:

This catalog contains sources from data collected by the IPC on board the EINSTEIN Observatory. This survey is designed to find extended sources and diffuse emission rather than point sources. In addition, the source detection algorithm is substantially improved over that used by EMSS. Sources were searched using circular apertures up to 6.1arcmin. The catalog contains 1326 extended source candidates at high galactic latitude (|b| > 20{deg}).
File Summary:
--------------------------------------------------------------------------------
 FileName        Lrecl       Records    Explanations
--------------------------------------------------------------------------------
ReadMe              80             .    This file
catalog            328          1325    The EXSS Catalogue
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See also:
    I/146 : Positions and Proper Motions (PPM-North)
    I/193 : Positions and Proper Motions (PPM-South)
    I/208 : Positions and Proper Motions (PPM-90000 Supplement)
    VII/4 : Abell and Zwicky Clusters of Galaxies
    IX/13 : 2E Catalogue (Harris+ 1994)
    IX/15 : Einstein extended medium-sensitivity survey (EMSS)
    telnet://einline@einline.harvard.edu/ : the EINLINE data-base

Byte-by-byte Description of file: catalog
--------------------------------------------------------------------------------
   Bytes Format  Units     Label   Explanations
--------------------------------------------------------------------------------
   1- 16  A16    ---       Name    !+ EXSS source name
  19- 27  F9.7   rad       RArad   Right Ascension (B1950.0)
  29- 38  F10.7  rad       DErad   Declination (B1950.0)
  40- 45  F6.3   ct/s      cts1    IPC photon counts per second for the
                                   aperture 1 detection (0.000 = no detection)
  47- 52  F6.3   ct/s      cts2    IPC photon counts per second for the
                                   aperture 2 detection (0.000 = no detection)
  54- 59  F6.3   ct/s      cts3    IPC photon counts per second for the
                                   aperture 3 detection (0.000 = no detection)
  61- 66  F6.3   ct/s      cts4    IPC photon counts per second for the
                                   aperture 3 detection (0.000 = no detection)
  68- 73  F6.2   ---       S/N1    ?=0.00 Signal to noise ratio for aperture 1
  75- 80  F6.2   ---       S/N2    ?=0.00 Signal to noise ratio for aperture 2
  82- 87  F6.2   ---       S/N3    ?=0.00 Signal to noise ratio for aperture 3
  89- 94  F6.2   ---       S/N4    ?=0.00 Signal to noise ratio for aperture 4
  98-102  F5.2   arcsec    dRA1    Offset in right ascension of the
                                   aperture 1 detection from the assumed
                                   object position (columns 1 and 2), which
                                   is found through the technique described
                                   in the paper
 106-110  F5.2   arcsec    dDE1    Offset in declination for aperture 1
 114-118  F5.2   arcsec    dRA2    Offset in right ascension for aperture 2
 122-126  F5.2   arcsec    dDE2    Offset in declination for aperture 2
 130-134  F5.2   arcsec    dRA3    Offset in right ascension for aperture 3
 138-142  F5.2   arcsec    dDE3    Offset in declination for aperture 3
 146-150  F5.2   arcsec    dRA4    Offset in right ascension for aperture 4
 154-158  F5.2   arcsec    dDE4    Offset in declination for aperture 4
 161-166  I6     ---       PPM     ?=-99 Star number from the Positions and
				    Proper Motions (PPM) Catalog (<I/146>,
				    <I/193> and <I/208>) for the star which
                                    is identified with the EXSS source.
 168-173  F6.2   mag       Vmag    ?=-99.00 V band magnitude of the PPM star
 176-181  F6.2   arcsec    dRA11   ?=-99.00 Right ascension difference between
                                     PPM and EXSS positions
 184-189  F6.2   arcsec    dDE11   ?=-99.00 Declination difference between the
                                     PPM and EXSS positions
 191-203  A13    ---       EMSS    EMSS source <IX/15> identified with
                                     the EXSS source
 205-208  A4     ---       Typ11   Type of the EMSS source (from EMSS catalog)
 211-215  F5.1   ---       S/N11   ?=-99.0 Signal to noise ratio of the EMSS
                                     source with the EMSS detection algorithm
 218-223  F6.2   arcsec    dRA12   ?=-99.00 Right ascension difference between
                                     the EMSS and the EXSS positions
 226-231  F6.2   arcsec    dDE12   ?=-99.00 Declination difference between
                                     the EMSS and the EXSS positions
 234-245  A12    ---       ZwCl    Zwicky cluster of galaxies identified with
				     the EXSS source (see cat. <VII/4>)
 249-253  F5.1   arcsec    Size    ?=-99.0 Approximate size of the Zwicky
                                    cluster (from the Zwicky catalog)
 256-261  F6.2   arcsec    dRA13   ?=-99.00 Right ascension difference between
                                    ZwCl and EXSS positions.
 264-269  F6.2   arcsec    dDE13   ?=-99.00 Declination difference between
                                    ZwCl and EXSS positions.
 273-282  A10    ---       Abell   Abell cluster of galaxies identified with
				    the EXSS source (see cat. <VII/4>)
 286-291  F6.2   arcsec    dRA14   ?=-99.00 Right ascension difference between
                                    Abell and EXSS positions
 294-299  F6.2   arcsec    dDE14   ?=-99.00 Declination difference between
                                    Abell and EXSS positions
 301-304  A4     ---       Typ14   The type of the corresponding source in
                                    the EINLINE database that is identified
                                    with the EXSS source (1)
 308-313 F6.2    arcsec    dRA15   ?=-99.00 Right ascension difference between
                                    EINLINE and EXSS positions
 316-321 F6.2    arcsec    dDE15   ?=-99.00 Declination difference between
                                    EINLINE and EXSS positions
 323-328 F6.2    arcsec2   d2      ?=140.01 The quadratic sum of dRA15 and dDE15
--------------------------------------------------------------------------------
Note (1): to enter the EINLINE service, telnet to    einline.harvard.edu
          login as 'einline', with no password
--------------------------------------------------------------------------------

History:
    From http://astro.caltech.edu/~bro/exss/exss.html
================================================================================
(End)               Jean-Marie Hameury, Francois Ochsenbein [CDS]    27-Aug-1997