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J. Hong, J. Grindlay, S. Laycock, E. M. Schlegel, P. Zhao (Havard-Smithsonian CfA)
Recent deep (520 ksec) Chandra observations on the Sgr A* by Muno et al. (2003, ApJ, 589, 225) discovered a significant population of hard X-ray (2-8 keV) sources strongly peaked around Sgr A*, falling off as 1/theta from the center. Preliminary analysis by Hong et al (2003, HEAD, 35, 1402) compared their spatial distribution with that of relatively shallow (2 x 12 ksec observation per field) and wide field (2 deg x 0.5 deg) observations around the Galactic center by Wang et al (2002, Nature, 415, 148). As a part of our on-going Chandra Multiwavelength Plane (ChaMPlane) Survey project to determine the accretion source content of the Galaxy, we (re)-analyzed all the available Chandra observations on the Galactic center region using Chandra analysis tools developed for ChaMPLane (Hong et al 2003). This analysis includes the Wang fields as well as archival data of a deep (100 ksec) Chandra observation of Sgr B2 (Takagi et al. 2002, ApJ, 573, 275) and other moderately deep (50 ksec) fields within 2 deg of the Galactic center. We derive logN-logS source distributions in the separate fields for a preliminary analysis of the overall source distribution in the central bulge. This is compared with the source distributions in our deep survey of Baade's Window (cf. Grindlay et al and Laycock et al; this meeting) for an initial estimate of the large scale point source distribution in the Bulge. This work is supported by NASA grants AR2-3002A and GO3-4033A.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.