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The Chandra Deep Wide-field Survey : a new Chandra Legacy Survey in the Boötes Field. I. x-ray point source catalog, number counts, and multiwavelength counterparts.

Masini, Alberto and Hickox, Ryan C. and Carroll, Christopher M. and Aird, James and Alexander, David M. and Assef, Roberto J. and Bower, Richard and Brodwin, Mark and Brown, Michael J. I. and Chatterjee, Suchetana and Chen, Chien-Ting J. and Dey, Arjun and DiPompeo, Michael A. and Duncan, Kenneth J. and Eisenhardt, Peter R. M. and Forman, William R. and Gonzalez, Anthony H. and Goulding, Andrew D. and Hainline, Kevin N. and Jannuzi, Buell T. and Jones, Christine and Kochanek, Christopher S. and Kraft, Ralph and Lee, Kyoung-Soo and Miller, Eric D. and Mullaney, James and Myers, Adam D. and Ptak, Andrew and Stanford, Adam and Stern, Daniel and Vikhlinin, Alexey and Wake, David A. and Murray, Stephen S. (2020) 'The Chandra Deep Wide-field Survey : a new Chandra Legacy Survey in the Boötes Field. I. x-ray point source catalog, number counts, and multiwavelength counterparts.', Astrophysical journal supplement series., 251 (1). p. 2.


We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg2 Boötes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the universe at high redshift. The Chandra Deep Wide-field Survey exploits the excellent sensitivity and angular resolution of Chandra over a wide area, combining 281 observations spanning 15 yr, for a total exposure time of 3.4 Ms, and detects 6891 X-ray point sources down to limiting fluxes of 4.7 × 10−16, 1.5 × 10−16, and 9 ×10−16 erg cm−2 s−1 in the 0.5–7, 0.5–2, and 2–7 keV bands, respectively. The robustness and reliability of the detection strategy are validated through extensive, state-of-the-art simulations of the whole field. Accurate number counts, in good agreement with previous X-ray surveys, are derived thanks to the uniquely large number of point sources detected, which resolve 65.0% ± 12.8% of the cosmic X-ray background between 0.5 and 2 keV and 81.0% ± 11.5% between 2 and 7 keV. Exploiting the wealth of multiwavelength data available on the field, we assign redshifts to ~94% of the X-ray sources, estimate their obscuration, and derive absorption-corrected luminosities. We provide an electronic catalog containing all of the relevant quantities needed for future investigations.

Item Type:Article
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Publisher statement:© 2020. The American Astronomical Society. All rights reserved.
Date accepted:06 September 2020
Date deposited:17 November 2020
Date of first online publication:22 October 2020
Date first made open access:17 November 2020

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