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J/MNRAS/371/38    X-ray observations of the Galaxy center   (Wang+, 2006)
The interplay between star formation and the nuclear environment of our Galaxy:
deep X-ray observations of the Galactic centre Arches and Quintuplet clusters.
    Wang Q.D., Dong H., Lang C.
   <Mon. Not. R. Astron. Soc., 371, 38-54 (2006)>
   =2006MNRAS.371...38W
ADC_Keywords: Molecular clouds ; X-ray sources

Keywords: stars: formation - stars: winds, outflows - stars: WolfRayet -
          ISM: clouds - Galaxy: centre - X-rays: ISM

Abstract:
    The Galactic centre (GC) provides a unique laboratory for a detailed
    examination of the interplay between massive star formation and the
    nuclear environment of our Galaxy. Here, we present a 100-ks Chandra
    Advanced CCD Imaging Spectrometer (ACIS) observation of the Arches and
    Quintuplet star clusters. We also report on a complementary mapping of
    the dense molecular gas near the Arches cluster made with the Owens
    Valley Millimeter Array. We present a catalogue of 244 point-like
    X-ray sources detected in the observation.

Description:
    Our deep Chandra ACIS-I observation (Obs. ID: 4500) was carried out on
    2004 June 9. The Arches cluster was placed about 1-arcmin away from
    the aim point to minimize the effect of the CCD gaps on mapping the
    extended X-ray emission around the cluster.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        72      244   Chandra Source List


See also:
    J/MNRAS/371/147 : XMM-Newton observation of NGC 2613 (Li+, 2006)


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

   Bytes Format Units     Label     Explanations

   1-  3  I3    ---      [WDL2006]  Source sequential number
       4  A1    ---    n_[WDL2006]  [*] Marginal detection [WDL2006] (1)
   6- 24  A19   ---       CXOU      CXOU Name (JHHMMSS.ss+DDMMSS.s)
  26- 28  F3.1  arcsec    e_Pos     Position uncertainty (2)
  30- 36  F7.2  ct/ks     CR        On-axis source broad-band count rate (3)
  38- 41  F4.2  ct/ks     e_CR      rms uncertainty on CR
  43- 47  F5.2  ---       HR        ?=- Hardness ratio, HR=(H-S2)/(H+S2) (4)
  49- 52  F4.2  ---       e_HR      ?=- rms uncertainty on HR
  55- 59  F5.2  ---       HR2       ?=- Hardness ratio, HR2= (H2-H1)/H (4)
  61- 64  F4.2  ---       e_HR2     ?=- rms uncertainty on HR2
  66- 72  A7    ---       Flag      [BHS, ] Detection band flags (5)

Note (1): Sources detected with a probability of false detection
     between 10-7 and 10-5 and are in the vicinity of the
     Arches and Quintuplet clusters are marked with a *.
Note (2): Position uncertainty (1sigma) calculated from the maximum
     likelihood centroiding and an approximate off-axis angle (r) dependent
     systematic error 0.2"+1.4"(r/8')2, which are added in quadrature.
Note (3): The sum of the exposure-corrected count rates in the four bands.

Note (4): Listed only for values with uncertainties less than 0.2.
     Definition of the bands: 1-2.5 (S1), 2.5-4 (S2), 4-6 (H1) and
     6-9keV (H2). In addition, S=S1+S2, H=H1+H2 and B=S+H.
Note (5): The label 'B', 'S' or 'H' mark the band in which a source is detected.
     The band which generates the most accurate X-ray centroid position
     is listed first.


Acknowledgements:
    Daniel Wang, wqd(at)astro.umass.edu
(End)                                      Patricia Vannier [CDS]    15-May-2007