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J/ApJ/518/656       ASCA Large Sky Survey                    (Ueda+, 1999)
logN-logS relations and spectral properties of sources from the ASCA Large Sky
Survey: their implications for the origin of the cosmic X-ray background (CXB)
       Ueda Y., Takahashi T., Inoue H., Tsuru T., Sakano M., Ishisaki Y.,
       Ogasaka Y., Makishima K., Yamada T., Akiyama M., Ohta K.
      <Astrophys. J. 518, 656 (1999)>
      =1999ApJ...518..656U      (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ;  X-ray sources

Mission_Name: ASCA

Keywords: diffuse radiation - galaxies: active - galaxies: statistics -
          X-rays: galaxies

Abstract:
    We carried out the first wide-area unbiased survey with the ASCA
    satellite in the 0.7-10keV band around a north Galactic-pole region
    covering a continuous area of 7deg2 (Large Sky Survey; LSS). To make
    the best use of ASCA's capabilities, we developed a new
    source-detection method in which the complicated detector responses
    are fully taken into account. Applying this method to the entire LSS
    data independently in the total (0.7-7keV), hard (2-10keV), and soft
    (0.7-2keV) bands, we detected 107 sources altogether, with sensitivity
    limits of 6x10-14 (0.7-7keV), 1x10-13 (2-10keV), and
    2x10-14ergs/s/cm2 (0.7-2keV), respectively. A complete list of the
    detected sources is presented.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       105      107   The source list in the LSS field


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 15  A15   ---     AX        Source name (AX JHHMM.m+DDMM)
      16  A1    ---     n_AX      [e] Note (5)
  18- 25  F8.4  deg     RAdeg     Right ascension (J2000) (1)
  27- 33  F7.4  deg     DEdeg     Declination (J2000) (1)
  35- 38  F4.1  ---     GISStot   GIS (Gas Imaging Spectrometer)
                                   total (0.7-7keV) band significance
      39  A1    ---     ---       [/]
  40- 43  F4.1  ---     SISStot   ? SIS (Solid-state Imaging Spectrometer)
                                     total (0.7-7keV) band significance (2)
  45- 48  F4.1  ---     GISShard  GIS hard (2-10KeV) band significance
      49  A1    ---     ---       [/]
  50- 53  F4.1  ---     SISShard  ? SIS hard (2-10KeV) band significance (2)
  55- 58  F4.1  ---     GISSsoft  GIS soft (0.7-2keV) band significance
      59  A1    ---     ---       [/]
  60- 63  F4.1  ----    SISSsoft  ? SIS soft (0.7-2keV) band significance (2)
  65- 68  F4.1  ct/ks   GISCRtot  GIS total (0.7-7keV) band count-rate (3)
      69  A1    ---     ---       [/]
  70- 73  F4.1  ct/ks   SISCRtot  ? SIS total (0.7-7keV) band count-rate (2) (3)
  75- 78  F4.1  ct/ks  GISCRhard  GIS hard (2-10KeV) band count-rate
      79  A1    ---     ---       [/]
  80- 83  F4.1  ct/ks  SISCRhard  ? SIS hard (2-10KeV) band count-rate (2) (3)
  85- 88  F4.1  ct/ks  GISCDsoft  GIS soft (0.7-2keV) band count-rate (3)
      89  A1    ---     ---       [/]
  90- 93  F4.1  ct/ks  SISCDsoft  ? SIS soft (0.7-2keV) band count-rate (2) (3)
  95- 99  F5.2  ---     GAMMA     Spectrum photon index (4)
 101-104  F4.2  ---     e_GAMMA   rms uncertainty on GAMMA

Note (1): Typical position uncertainty is about 0.7' in radius.

Note (2): Band significances are expressed in σ.
           No value means out of FOV (only for the SIS).
Note (3): Vignetting-corrected count rate at the reference position in the XRT
           coordinate (8.5'offset for the GIS and 7.0' offset for the SIS)
           integrated within a radius of 6' (GIS) and 4' (SIS).
Note (4): The best-fit photon index obtained by the simultaneous fitting of the
           GIS and the SIS spectra in the 0.7-10keV range, assuming a power law
           with the Galactic absorption (1.1x1020cm-2). Error is a
           1σ statistical error for a single parameter.
Note (5): Corresponds to the LSS hardest source. The position is taken from
           results of deep X-ray observations by Sakano et al. 1998.


History: From ApJ electronic version

(End)                           James Marcout, Patricia Bauer [CDS]  14-Sep-1999