Access to Astronomical Catalogues

J/ApJ/600/716       NGC 5128 Chandra X-ray point sources     (Minniti+, 2004)
Optical counterparts of X-ray point sources observed by Chandra in NGC 5128:
20 new globular cluster X-ray sources.
    Minniti D., Rejkuba M., Funes J.G., Akiyama S.
   <Astrophys. J., 600, 716-728 (2004)>
   =2004ApJ...600..716M
ADC_Keywords: Clusters, globular ; X-ray sources ; Photometry

Keywords: galaxies: individual (Centaurus A, NGC 5128) -
          globular clusters: general - X-rays: galaxies - X-rays: stars

Abstract:
    Very Large Telescope images in BVI are used to identify the optical
    counterparts to bright Chandra X-ray points sources discovered by
    Kraft and coworkers (2001, Cat. J/ApJ/560/675). Of a total of 111
    X-ray point sources with LX>2x1036erg/s present in a 56arcmin2
    field centered on this galaxy, 58 have optical counterparts. On the
    basis of the sizes, optical magnitudes, and colors, 20 new globular
    cluster counterparts of X-ray sources are identified, and three are
    identified on the basis of their sizes. This brings the total number
    of globular cluster X-ray sources in this galaxy to 33 and establishes
    that 30% of the X-ray point sources in NGC 5128 are associated with
    globular clusters.

Description:
    The images of the inner regions of NGC 5128 were taken from the
    European Southern Observatory (ESO) Archive. The 300s image in the
    B-band filter, 240s image in the V-band filter, and 300s image in
    the I-band filter covering the central 6.8'x6.8' of NGC 5128 were
    acquired with FORS2 at the ESO VLT Unit Telescope 4 (Kueyen).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       113       97   Optical Identifications of NGC 5128 X-Ray Point
                             Sources
table2.dat       113       14   Additional Optical Identifications of NGC 5128
                             X-Ray Point Sources
table3.dat        77       33   NGC 5128 Globular Cluster X-Ray Sources


See also:
   J/ApJ/560/675 : Chandra X-ray point sources in Cen A (Kraft+, 2001)
   J/A+A/369/812 : UVKs photometry of NGC 5128 globular clusters (Rejkuba, 2001)


Byte-by-byte Description of file: table1.dat table2.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---    [MRF2004]  Sequential number
   5-  6  I2    h       RAh       Right ascension (J2000)
   8-  9  I2    min     RAm       Right ascension (J2000)
  11- 15  F5.2  s       RAs       Right ascension (J2000)
      17  A1    ---     DE-       Declination sign (J2000)
  18- 19  I2    deg     DEd       Declination (J2000)
  21- 22  I2    arcmin  DEm       Declination (J2000)
  24- 28  F5.2  arcsec  DEs       Declination (J2000)
  30- 39  E10.3 10-7W   LX316     ? X-ray luminosity in the 0.4-10keV band,
                                     on 5 Dec. 1999 (1)
  41- 49  E9.3  10-7W   LX962     ? X-ray luminosity in the 0.4-10keV band,
                                     on 17 May 2000 (1)
  51- 54  I4    pix     Xpos      ? X position
  56- 59  I4    pix     Ypos      ? Y position
  61- 65  F5.2  mag     Bmag      ? B magnitude from ESO VLT
  67- 70  F4.2  mag     e_Bmag    ? rms uncertainty on Bmag
  72- 76  F5.2  mag     Vmag      ? V magnitude from ESO VLT
  78- 81  F4.2  mag     e_Vmag    ? rms uncertainty on Vmag
  83- 87  F5.2  mag     Imag      ? I magnitude from ESO VLT
  89- 92  F4.2  mag     e_Imag    ? rms uncertainty on Imag
  94-113  A20   ---     Com       Comments (2)

Note (1): Luminosities from Kraft et al., 2001, Cat. J/ApJ/560/675

Note (2): Notes are the following:
      Sat.: saturated
       FGS: foreground star
        GC: globular cluster
       GC?: possible globular cluster
  Hα: detected in Hα
        FC: faint optical counterpart detected in VLT images.


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

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     GC        Globular cluster designation (1)
   7-  8  I2    h       RAh       Right ascension (J2000)
  10- 11  I2    min     RAm       Right ascension (J2000)
  13- 17  F5.2  s       RAs       Right ascension (J2000)
      19  A1    ---     DE-       Declination sign (J2000)
  20- 21  I2    deg     DEd       Declination (J2000)
  23- 24  I2    arcmin  DEm       Declination (J2000)
  26- 30  F5.2  arcsec  DEs       Declination (J2000)
  32- 39  E8.3  10-7W   LX316     ? X-ray luminosity in the 0.4-10keV band,
                                     on 5 Dec. 1999 (2)
  41- 48  E8.3  10-7W   LX962     ? X-ray luminosity in the 0.4-10keV band,
                                     on 17 May 2000 (2)
  50- 54  F5.2  mag     Bmag      ? B magnitude from ESO VLT
  56- 60  F5.2  mag     Vmag      ? V magnitude from ESO VLT
  62- 66  F5.2  mag     Imag      ? I magnitude from ESO VLT
  68- 70  A3    ---     Spectrum  [Yes ]
  72- 75  A4    ---     Com       Comments (3)
      77  A1    ---     n_GC      [*] *: Individual note (4)

Note (1): Cluster designations:
     NNN: [MRF2004] NNN (this paper)
    GNNN: [HGH92] GNNN (Harris et al., 1992AJ....104..613H)
   fN.NN: [R2001b] fN.GCNN (Rejkuba, 2001, Cat. J/A+A/369/812)
Note (2): Luminosities from Kraft et al., 2001, Cat. J/ApJ/560/675

Note (3): Notes are the following:
    Sat.: saturated
     GC?: no colors available
     H92: Harris et al., 1992AJ....104..613H
     M96: Minniti et al., 1996ApJ...467..221M
     R01: Rejkuba, 2001, Cat. J/A+A/369/812
Note (4): *: Source 53 is not matched in our frames; the GC association
     is from Kraft et al., 2001, Cat. J/ApJ/560/675


History:
    From electronic version of the journal
(End)                       James Marcout, Patricia Vannier [CDS]    16-Mar-2004