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J/ApJ/613/279       ACS Virgo Cluster Survey. III. M87       (Jordan+, 2004)
The ACS Virgo Cluster Survey. III. Chandra and Hubble space telescope
observations of low-mass X-ray binaries and globular clusters in M87.
    Jordan A., Cote P., Ferrarese L., Blakeslee J.P., Mei S., Merritt D.,
    Milosavljevic M., Peng E.W., Tonry J.L., West M.J.
   <Astrophys. J., 613, 279-301 (2004)>
   =2004ApJ...613..279J
ADC_Keywords: Clusters, galaxy ; Surveys ; Binaries, X-ray ; Clusters, globular

Mission_Name: Chandra

Keywords: galaxies: elliptical and lenticular, cD -
          galaxies: individual (M87) - galaxies: star clusters -
          globular clusters: general - X-rays: binaries

Abstract:
    The ACIS instrument on board the Chandra X-Ray Observatory has been
    used to carry out the first systematic study of low-mass X-ray
    binaries (LMXBs) in M87, the giant elliptical galaxy near the
    dynamical center of the Virgo Cluster. These images - with a total
    exposure time of 154 ks - are the deepest X-ray observations yet
    obtained of M87. We identify 174 X-ray point sources, of which 150 are
    likely LMXBs.

Description:
    M87 (NGC 4486) was observed with the Chandra Advanced CCD Imaging
    Spectrometer (ACIS) for 121ks on 2002 July 5-6. In what follows, we
    use only the S3 chip data. In addition, we used 38ks of archival ACIS
    observations of M87 taken on 2000 July 29.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       123      174   X-ray Point-sources in M87


See also:
   J/ApJS/153/223 : ACS Virgo Cluster Survey. I (Cote+, 2004)
   J/ApJS/154/509 : ACS Virgo Cluster Survey. II (Jordan+, 2004)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units    Label     Explanations

   1-  3  I3    ---     [JCF2004]  Identification number
   5-  8  A4    ---      ---       [CXOU]
  10- 25  A16   ---      CXOU      CXOU designation (JHHMMSS.s+DDMMSS)
  27- 31  F5.2  10-4ct/s CR        Count rate
  33- 38  F6.2  10+30W   XLum      The 0.3-10keV band luminosity
                                    in units of 1037erg/s (1)
  40- 44  F5.2  ---      H21       The 2-1 hardness ratio (2)
  46- 50  F5.2  ---      H31       The 3-1 hardness ratio (2)
  52- 54  A3    ---      ACS       [yes no] ACS observation ?
  56-123  A68   ---      OC        Information on optical counterpart

Note (1): Obtained assuming a power law spectral shape with power law index
          κ=1.64 and a Galactic hydrogen column density
          NH=2.5.1020cm-2 (Stark et al., 1992, Cat. VIII/10).
Note (2): Where H21=(M-S)/(M+S) and H31=(H-S)/(H+S) and S, M and H are the
          counts in a soft (0.3-1keV), medium (1-2keV), and hard (1-10keV)
          energy bands respectively.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    28-Jan-2005