ACDS V10.0 - Detailed Description of J/ApJS/134/77

ACDS V10.0 - Wed Jan 29 13:57:16 CET 2025

| # Detailed Description of J/ApJS/134/77 : ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001) |

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.

    J/ApJS/134/77    ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001)
    ================================================================================
    Faint X-ray sources resolved in the ASCA galactic plane survey and
    their contribution to the galactic ridge X-ray emission.
          Sugizaki M., Mitsuda K., Kaneda H., Matsuzaki K., Yamauchi S., Koyama K.
         <Astrophys. J. Suppl. Ser. 134, 77 (2001)>
         =2001ApJS..134...77S
    ================================================================================
    ADC_Keywords: Galactic plane ; X-ray sources

    Mission_Name: ASCA

    Keywords: Galaxy: general - X-rays: general

    Abstract:
        The X-ray emission from the central region of the Galactic plane,
        |l|<~45° and |b|<~0.4°, was studied in the 0.710keV energy
        band with a spatial resolution of ~3' with the Advanced Satellite for
        Cosmology and Astrophysics (ASCA) observatory. We developed a new
        analysis method for the ASCA data to resolve discrete sources from the
        extended Galactic ridge X-ray emission (GRXE). We successfully
        resolved 163 discrete sources with an X-ray flux down to
        10-12.5ergs/cm2/s and determined the intensity variations of the
        GRXE as a function of the Galactic longitude with a spatial resolution
        of about 1°.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table2.dat       200      163   Source List of the ASCA Galactic Plane Survey
    × table5.dat       148       10   Summary of 10 Relatively Bright X-Ray Sources with
                                  F>10-11ergs/cm2/s in the Resolved Sources

    See also:
       J/ApJ/518/656 : ASCA Large Sky Survey (Ueda+, 1999)
               IX/13 : The 2E Catalogue (Harris+ 1994)
               IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
             VII/211 : A Catalogue of Galactic Supernova Remnants (Green 1998)

    Byte-by-byte Description of file:  table2.dat

       Bytes Format Units       Label    Explanations

           1  A1    ---         n_AXJ    [*] Note on ASCA name (1)
       2- 16  A15   ---         AXJ      ASCA Name
      18- 24  F7.3  deg         GLON     [-90/90] Galactic longitude
      26- 31  F6.3  deg         GLAT     Galactic latitude
      33- 39  F7.3  deg         RAdeg    Right ascension (J2000) (2)
      41- 47  F7.3  deg         DEdeg    Declination (J2000) (2)
      49- 54  F6.1  ct/ks       F1       ? Flux at 0.7-2keV, in ct/ks/GIS (3)
          55  A1    ---         ---      [/]
      56- 60  F5.1  ---         e_F1     ? Detection significance of F1, see Eq.6
      62- 67  F6.1  ct/ks       F3       ? Flux at 0.7-7keV, in ct/ks/GIS (3)
          68  A1    ---         ---      [/]
      69- 73  F5.1  ---         e_F3     ? Detection significance of F3, see Eq.6
      75- 80  F6.1  ct/ks       F2       ? Flux at 2-10keV, in ct/ks/GIS (3)
          81  A1    ---         ---      [/]
      82- 85  F4.1  ---         e_F2     ? Detection significance of F2, see Eq.6
      87- 91  F5.2  10-15W/m2   Flux     ? Flux in 0.7-10 keV (PL parameter) (4)
      93- 97  F5.2  ---         Gamma    ? Photon-law index (PL parameter) (4)
      99-102  F4.2  ---         e_Gamma  ? Error in Gamma (lower limit)
     104-107  F4.2  ---         E_Gamma  ? Error in Gamma (upper limit)
     109-113  F5.2  10+22cm-2   NH       ? Absorption hydrogen column density
     115-119  F5.2  10+22cm-2   e_NH     ? Error in NH (lower limit)
     121-125  F5.2  10+22cm-2   E_NH     ? Error in NH (upper limit)
     127-131  F5.2  ---         ChiNu2   ? Reduced {chi}{nu}2 for 10 degrees
                                            of freedom (not {chi}{nu} as stated
                                            in the paper)
     133-200  A68   ---         Id       Identification (5)

    Note (1): The asterisk on a source name denotes reduced accuracy because
         the source location is near the edge of the field of view.
    Note (2): Uncertainty of the position coordinates is ~1.0'=0.016°
         Ueda et al., 1999, Cat. J/ApJ/518/656
    Note (3): Flux obtained from image fitting analysis are shown in
        counts/ks/GIS (countrate for a single GIS detector -- ASCA has two
        GISs), a count rate observed at the GIS nominal position, for each
        energy band. Blanks mean no source candidates in the energy band.
    Note (4): Best-fit parameters of a power-law model, photon index Gamma,
        absorption column density NH (1022cm-2), flux
        (10-12ergs/cm2/s) in 0.7-10keV and reduced {Chi}.{Chi}{nu} for
        10 degrees of freedom, are shown for the sources with the significance
        above 5{sigma}.  All errors represent 90% confidence limits.
        Blanks in the errors mean that the best-fit power-law model is
        unacceptable within a 97% confidence limit ({Chi}{nu}<2).
    Note (5): Identified catalog sources within the position determination
        accuracy of 1' in the Einstein IPC X-ray Source Catalog (2E, Cat.
        IX/13), the ROSAT All-Sky Survey Bright Source Catalog (1RXS, Cat.
        IX/10), the Green Galactic SNR Catalogue (G, Cat. VII/211), and
        catalogues of optical stars in SIMBAD database (SIM).

    Byte-by-byte Description of file:  table5.dat

       Bytes Format   Units      Label   Explanations

       1- 15  A15     ---        AXJ     ASCA name
      17- 21  F5.2    ---        Gamma   Photon index (1)
      23- 26  F4.2    ---       E_Gamma  ? Error in Gamma (upper limit)
      28- 31  F4.2    ---       e_Gamma  ? Error in Gamma (lower limit)
      33- 37  F5.2    10+22cm-2  NH      Absorption column density
      39- 42  F4.2    10+22cm-2  E_NH    ? Error in NH (upper limit)
      44- 47  F4.2    10+22cm-2  e_NH    ? Error in NH (lower limit)
      49- 52  F4.1    10-15W/m2  Flux    Flux in he 0.7-10keV band
          54  A1      ---        f_Flux  [O] Flux variability with a confidence
                                              above 99%
      56-148  A93     ---        Id      Identification and References

    Note (1): Best-fit values of power-law model, extracted from table2.dat

    History:
        From electronic version of the journal
      * 18-Dec-2001: thanks to checks by Stephen A. Drake
        (drake@olegacy.gsfc.nasa.gov), explanations of the flux parameters
        were corrected, as well as errors on Gamma and NH, and error in the
        definition of the ChiNu2 parameter.
    ================================================================================
    (End)                                        Patricia Bauer [CDS]    08-Jun-2001