SIMBAD references

2005ApJS..156...35E - Astrophys. J., Suppl. Ser., 156, 35-45 (2005/January-0)

The serendipitous extragalactic X-ray source identification (SEXSI) program. II. Optical imaging.

ECKART M.E., LAIRD E.S., STERN D., MAO P.H., HELFAND D.J. and HARRISON F.A.

Abstract (from CDS):

The Serendipitous Extragalactic X-ray Source Identification (SEXSI) Program is designed to expand significantly the sample of identified extragalactic hard X-ray sources at intermediate fluxes, 10–13ergs/cm2/s≲S2–10keV<10–15ergs/cm2/s. SEXSI, which includes sources derived from more than 2 deg2 of Chandra images, provides the largest hard X-ray-selected sample yet studied, offering an essential complement to the Chandra Deep Fields (total area ∼0.2 deg2). In this paper we describe R-band optical imaging of the SEXSI fields from the Palomar, MDM, and Keck observatories. We have identified counterparts or derived flux limits for nearly 1000 hard X-ray sources. Using the optical images, we derive accurate source positions. We investigate correlations between optical and X-ray flux, and optical flux and X-ray hardness ratio. We also study the density of optical sources surrounding X-ray counterparts, as well as the properties of optically faint, hard X-ray sources.

Abstract Copyright:

Journal keyword(s): Catalogs - Galaxies: Active - Surveys - X-Rays: Galaxies - X-Rays: General

VizieR on-line data: <Available at CDS (J/ApJS/156/35): table3.dat>

Simbad objects: 1061

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