Arendt, R. G. and Gezari, D. Y. and Stolovy, S. R. and Sellgren, K. and Smith, R. and Ramírez, S. V. and Yusef-Zadeh, F. and Law, C. J. and Smith, H. A. and Cotera, A. S. and Moseley, S. H. (2008) Comparison of 3.6-8.0 μm Spitzer/IRAC Galactic Center Survey Point Sources with Chandra X-Ray Point Sources in the Central 40 × 40 Parsecs. Astrophysical Journal, 685 (2). pp. 958-970. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090930-094436942
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We have studied the correlation between 2357 Chandra X-ray point sources in a 40 × 40 pc field and ~20,000 infrared sources we observed in the corresponding subset of our 2° × 1.4° Spitzer/IRAC Galactic Center Survey at 3.6-8.0 μm, using various spatial and X-ray hardness thresholds. The correlation was determined for source separations of less than 0.5", 1", or 2". Only the soft X-ray sources show any correlation with infrared point sources on these scales, and that correlation is very weak. The upper limit on hard X-ray sources that have infrared counterparts is <1.7% (3 σ). However, because of the confusion limit of the IR catalog, we only detect IR sources with absolute magnitudes ≾ 1. As a result, a stronger correlation with fainter sources cannot be ruled out. Only one compact IR source, IRS 13, coincides with any of the dozen prominent X-ray emission features in the 3 × 3 pc region centered on Sgr A^*, and the diffuse X-ray and IR emission around Sgr A^* seems to be anticorrelated on a few-arcsecond scale. We compare our results with previous identifications of near-infrared companions to Chandra X-ray sources.
|Additional Information:||© 2008 The American Astronomical Society. Received 2007 December 12; accepted 2008 June 10. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA. K. S. thanks the NASA Faculty Fellowship Program for financial support and the hospitality of JPL’s Long Wavelength Center and the Spitzer Science Center. We thank the referee for substantial comments and suggestions.|
|Subject Keywords:||Galaxy : center; infrared : stars; X-rays : binaries|
|Official Citation:||Comparison of 3.6-8.0 μm Spitzer/IRAC Galactic Center Survey Point Sources with Chandra X-Ray Point Sources in the Central 40 × 40 Parsecs R. G. Arendt, D. Y. Gezari, S. R. Stolovy, K. Sellgren, R. Smith, S. V. Ramírez, F. Yusef-Zadeh, C. J. Law, H. A. Smith, A. S. Cotera, and S. H. Moseley 2008 ApJ 685 958-970 doi: 10.1086/591015.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||02 Oct 2009 22:01|
|Last Modified:||26 Dec 2012 11:26|
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