Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2406m&link_type=abstract
American Astronomical Society, HEAD meeting #10, #24.06
Astronomy and Astrophysics
Astronomy
Scientific paper
We will present the results of a multi-wavelength study of the central 300 pc of the Galaxy, focusing on results of 1.9 Msec of Chandra observations (0.6 Msec new, 1.3 Msec archival). The region contains 1% of the stars in the Galaxy, and in this region one can find all of the processes in a stellar life cycle. We find over 8000 X-ray sources that are located near or beyond the Galactic center, most of which are accreting white dwarfs. However, by comparing X-ray and infrared observations, we find that 300 X-ray sources are likely to be young, high-mass X-ray binaries or colliding-wind binaries. We show that the influence of this young stellar population can be seen in the hot plasma that pervades much of the region, the most dramatic of which is a bubble blown in the ISM by the Quintuplet cluster. We also catalog the transient systems, which are likely to be accreting neutron stars and black holes in binaries. At least 85% of the transients do not have detectable infrared counterparts, which suggests that they have low-mass secondaries. Compared with the Galactic disk, therefore, low-mass X-ray binaries seem over-abundant, which could be understood if X-ray binaries are formed through dynamical interactions in Galactic nuclei.
Bauer Florian
Chandra Galactic Center Team
Mauerhan Jon
Muno Michael P.
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