Discovery and Interpretation of an X-Ray Period in the Galactic Center Source CXOGC J174536.1-285638

Details Discovery and Interpretation of an X-Ray Period in the Galactic Center Source CXOGC J174536.1-285638 Discovery and Interpretation of an X-Ray Period in the Galactic Center Source CXOGC J174536.1-285638

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...689.1222m&link_type=abstract

The Astrophysical Journal, Volume 689, Issue 2, pp. 1222-1233.

Astronomy and Astrophysics

Astronomy

2

Accretion, Accretion Disks, Infrared: Stars, Stars: Individual (Cxogc J174536.1-2856), X-Rays: Binaries, X-Rays: Stars

Scientific paper

We present X-ray and infrared observations of the X-ray source CXOGC J174536.1-285638. Previous observations suggest that this source may be an accreting binary with a high-mass donor (HMXB) or a colliding wind binary (CWB). Based on the Chandra and XMM-Newton light curve, we have found an apparent 189+/-6 day periodicity with better than 99.997% confidence. We discuss several possible causes of this periodicity, including both orbital and superorbital interpretations. We explore in detail the possibility that the X-ray modulation is related to an orbital period and discuss the implications for two scenarios; one in which the variability is caused by obscuration of the X-ray source by a stellar wind, and the other in which it is caused by an eclipse of the X-ray source. We find that in the first case, CXOGC J174536.1-285638 is consistent with both CWB and HMXB interpretations, but in the second, CXOGC J174536.1-285638 is more likely a HMXB.

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