Discovery of a Significant Magnetic CV Population in the Galactic Center Region

Details Discovery of a Significant Magnetic CV Population in the Galactic Center Region Discovery of a Significant Magnetic CV Population in the Galactic Center Region

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21810802h&link_type=abstract

American Astronomical Society, AAS Meeting #218, #108.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The large number (>3000) of the low-luminosity (10^30-33 erg/s at 8 kpc) X-ray sources discovered in the Galactic Center Region (GCR) are of great importance for understanding the evolutionary history of compact objects, accreting binaries and the inner Galaxy. We have identified 10 periodic X-ray sources and 11 candidates out of 843 X-ray sources (net counts>=50) discovered in the 1 Ms Chandra/ACIS-I exposure of the low extinction "Limiting Window" field 1.4 deg south of the Galactic Center. Their period distribution, hard X-ray spectra, and high X-ray-to-optical flux ratios are typical of magnetic cataclysmic variables (MCVs), resembling those of the periodic sources found in the Sgr A* field. When inspected in the detail, however, their properties appear to fit better with a rare sub-class of MCVs, near synchronous MCVs, which is sometimes considered a missing link in the evolution of MCVs from intermediate polars to polars. Our simulations for completeness for discovery of such sources, with periods in the range 150 - 10^4 sec, suggest that 20-30% of the hard X-ray sources in the LW field (and probably Sgr A*) with significant low energy absorption (and thus located in the GCR) are periodic, implying a large population of MCVs in the Bulge.

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