ACDS V10.0 - Detailed Description of IX/13

ACDS V10.0 - Wed Jan 29 14:18:13 CET 2025

| # Detailed Description of IX/13 : The 2E Catalogue (Harris+ 1994) |

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/13               The 2E Catalogue      (Harris+ 1994)
    ================================================================================
    EINSTEIN Observatory catalog of IPC X-ray sources
        Harris D.E., Forman W, Gioa I.M., Hale J.A., Harnden Jr. F.R., Jones C.,
        Karakashian T., Maccacaro T., McSweeney J.D., Primnini F.A., Schwarz J.,
        Tananbaum H.D., Thurman J.
       <SAO HEAD CD-ROM Series I (Einstein), Nos 18-36 (1994)>
    ================================================================================
    ADC_Keywords: X-ray sources

    Mission_Name: Einstein

    Description:
        This catalog contains sources from EINSTEIN IPC (Imaging Proportional
        counter aboard the EINSTEIN (HEAO 2) satellite, in orbit between
        November 1978 and April 1981) detected during pointed observations.

        Note that a single source may have more than one entry in the catalog.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × 2e.dat           114     5948   The catalogue

    See also:
        The IPC Slew Survey (1ES) catalog
        ftp://einline.harvard.edu : the Einstein On-Line System FTP service
        http://hea-www.harvard.edu/einstein/Ein_home/ein_welcome.html :
                the Einstein Home Page at Harvard.

    Byte-by-byte Description of file:  2e.dat

       Bytes Format  Units   Label    Explanations

       1-  4  I4     ---     CATNUM   [1/4809]+= Catalogue number of the source (1)
       5- 10  I6     ---     SEQNUM   Sequence number for the observation
      11- 13  I3     ---     FLDNUM   Field number of the source
      14- 16  I3     h       RAh      Right ascension 1950 (hours)
      17- 19  I3     min     RAm      Right ascension 1950 (minutes)
      20- 24  F5.1   s       RAs      Right ascension 1950 (seconds)
          26  A1     ---     DE-      Declination 1950 (sign)
      27- 28  I2     deg     DEd      Declination 1950 (degrees)
      29- 31  I3     arcmin  DEm      Declination 1950 (minutes)
      32- 34  I3     arcsec  DEs      Declination 1950 (seconds)
      35- 38  I4     arcsec  PosErr   Positional error (arcsec)
      39- 48  F10.5  ct/s    Crate    Corrected count rate
      49- 56  F8.5   ct/s    e_Crate  Error on the count rate
      57- 64  F8.1   s       LivTime  Live time (in seconds, at the field center)
      65- 73  F9.1   ---    NetCount  Net counts in the detect cell
      74- 81  F8.1   ---    BkgCount  Background counts in the detect cell
      82- 87  F6.1   ---     S/N      Signal to noise ratio for the detection
      88- 94  F7.1   ---     SizCor   Size correction factor (2)
      95- 99  I5     ---     RECode   Ribs and edges code (3)
     100-104  F5.1   arcmin  OffAxis  Dist. between source & field center (arcmin)
     105-110  A6     ---     SrcFlag  [AaHLEI ] Source flags (4)
     111-114  A4     ---     RefFlag  Reference and identification flag (5)

    Note (1): The name can either be of the form 2E CATNUM, or be based on 1950
         positions (format 2E HHMM.M+DDMM)
    Note (2): The size correction is a factor which serves to correct all
         intensity measurements (optimized for point sources) of resolved
         sources for the x-ray flux ignored by the detection box measurements.
         SizCor is defined as the ratio of the intensity contained within the 3
         sigma contour to the intensity within the detection box (2.4'x2.4'),
         the latter value corrected for the point response function and mirror
         scattering.
    Note (3): RECode is a numeric flag with non-zero values indicating that the
         detection cell falls near or on a rib shadow or detector edge. The
         code contains two embedded numbers expressed in 4 digits: the first
         two (thousands and hundreds) give the total number (max # = 16) of
         frame subcells shadowed by the ribs or masked field edge; the last
         two (tens and units digits) give the total number of subcells
         (maximum = 09) within the detect box which are shadowed.
    Note (4): The flags are:
         A - additional detections of this source were achieved in other
             observations
         a - Probably should be paired with another detection; but separation
             exceeded cutoff and thus not assigned an "A" flag.
         H - a hardness ratio is available
         L - the source was detected only with the local detect method
         E - intensity corrected for source near the exposure cutoff at
             the field edge.
         I - source detected by local detect near a field edge.  Intensity
             adjusted to remove redundant exposure corrections.
    Note (5): The reference indicator serves to alert the user to
         the following bibliographic information:
         AGN     Active Galactic Nucleus
         BL      BL Lac object
         CLG     Cluster (or group) of galaxies
         CV      Cataclysmic Variable
         G       Galaxy
         GLB     Globular Cluster
         P       Pulsar
         Q       Quasar
         RS      Radio source
         S       Star
         SNR     Supernova Remnant
         SY      Seyfert Galaxy
         *       Reference available, but no optical class
         +       Generic indicator which means possible ID lies from
                 100-150 arcseconds from source location.

    History:
        The catalogue was prepared from the Einline version by
        Jean-Marie Hameury (Strasbourg Observatory) in October 1996.
    ================================================================================
    (End)                              Jean-Marie Hameury  [Strasbourg]  1996-Oct-25