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

Alberto Masini, Ryan C. Hickox, Christopher M. Carroll, James Aird, David M. Alexander, Roberto J. Assef, Richard Bower, Mark Brodwin, Michael J.I. Brown, Suchetana Chatterjee, Chien Ting J. Chen, Arjun Dey, Michael A. Dipompeo, Kenneth J. Duncan, Peter R.M. Eisenhardt, William R. Forman, Anthony H. Gonzalez, Andrew D. Goulding, Kevin N. Hainline, Buell T. JannuziChristine Jones, Christopher S. Kochanek, Ralph Kraft, Kyoung Soo Lee, Eric D. Miller, James Mullaney, Adam D. Myers, Andrew Ptak, Adam Stanford, Daniel Stern, Alexey Vikhlinin, David A. Wake, Stephen S. Murray

Research output: Contribution to journalReview ArticleResearchpeer-review


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.

Original languageEnglish
Article number2
Number of pages26
JournalThe Astrophysical Journal Supplement Series
Issue number1
Publication statusPublished - 22 Oct 2020

Cite this