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arXiv · 0910.2675

The SWIRE/Chandra Survey: The X-ray Sources

Belinda J. Wilkes·Roy Kilgard·Dong-Woo Kim·Minsun Kim·Mari Polletta·Carol Lonsdale·Harding E. Smith·Jason Surace·Frazer N. Owen·A. Franceschini·Brian Siana·David Shupe
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Abstract

We report a moderate-depth (70 ksec), contiguous 0.7 sq.deg, Chandra survey, in the Lockman Hole Field of the Spitzer/SWIRE Legacy Survey coincident with a completed, ultra-deep VLA survey with deep optical and near-infrared imaging in-hand. The primary motivation is to distinguish starburst galaxies and AGN, including the significant, highly obscured (log N_H >23) subset. Chandra has detected 775 X-ray sources to a limiting broad band (0.3-8 keV) flux ~4E-16 erg/cm^2/s. We present the X-ray catalog, fluxes, hardness ratios and multi-wavelength fluxes. The log N vs. log S agrees with those of previous surveys covering similar flux ranges. The Chandra and Spitzer flux limits are well matched: 771 (99%) of the X-ray sources have IR or optical counterparts, and 333 have MIPS 24 um detections. There are 4 optical-only X-ray sources and 4 with no visible optical/IR counterpart. The very deep (~2.7 uJy rms) VLA data yields 251 (> 4 sigma) radio counterparts, 44% of the X-ray sources in the field. We confirm that the tendency for lower X-ray flux sources to be harder is primarily due to absorption. As expected, there is no correlation between observed IR and X-ray flux. Optically bright, Type 1 and red AGN lie in distinct regions of the IR vs X-ray flux plots, demonstrating the wide range of SEDs in this sample and providing the potential for classification/source selection. The classical definition of radio-loudness, R_L, is not effective at selecting strong radio sources for red and relatively optically faint AGN. Using the 24 um to radio flux ratio (q_24) results in the usual ~10% radio-loud AGN (13 of 147).

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Belinda J. Wilkes, Roy Kilgard, Dong-Woo Kim, Minsun Kim, Mari Polletta, Carol Lonsdale, Harding E. Smith, Jason Surace, Frazer N. Owen, A. Franceschini, Brian Siana, David Shupe. 2009-10-14. The SWIRE/Chandra Survey: The X-ray Sources. https://doi.org/10.1088/0067-0049/185/2/433

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