ACDS V10.0 - Detailed Description of IX/18

ACDS V10.0 - Mon Feb 03 14:40:01 CET 2025

| # Detailed Description of IX/18 : EINSTEIN extended source survey (EXSS) (Oppenheimer+ 1997) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    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°).

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × catalog          328     1325   The EXSS Catalogue

    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 detection in
                                    aperture 1 (0.000 = no detection)
      47- 52  F6.3  ct/s    cts2      IPC photon counts per second for detection in
                                    aperture 2 (0.000 = no detection)
      54- 59  F6.3  ct/s    cts3      IPC photon counts per second for detection in
                                    aperture 3 (0.000 = no detection)
      61- 66  F6.3  ct/s    cts4      IPC photon counts per second for detection in
                                    aperture 4 (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), 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
     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  arcsec  d2        ?=140.01 The quadratic sum of dRA15 and dDE15

    History:
      * 27-Aug-1997: From http://astro.caltech.edu/~bro/exss/exss.html
      * 09-Dec-2005: A few typos in this ReadMe corrected.
    ================================================================================
    (End)               Jean-Marie Hameury, Francois Ochsenbein [CDS]    27-Aug-1997