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P.S. Coppi, S. N. Virani, J. Van Duyne, C. M. Urry (Yale Univ.), E. Treister (Yale Univ. & U. de Chile), E. Gawiser (Yale Univ.), H. Francke (U. de Chile), MUSYC Collaboration
The MUltiwavelength Survey by Yale-Chile (MUSYC) includes as one of its four 1/4-degree fields the Extended Chandra Deep Field-South (ECDFS), for which a recent public X-ray survey covered ~1100 square arcminutes with 4 Chandra ACIS-I pointings centered on the original CDF-S field, to a depth of approximately 228 ks. This is the largest Chandra survey ever conducted at such depth. We detect 651 unique X-ray sources, of which 561 are detected in the full 0.5--8.0 keV band, 529 in the soft 0.5--2.0 keV band, and 335 in the hard 2.0--8.0 keV band. Seventy-three percent of the X-ray sources have optical counterparts in deep MUSYC imaging of this field while 26% have no apparent counterpart down to R=27.1 (AB). The remaining 1% have multiple optical counterparts within 1.5" of their X-ray position. We present the magnitude distributions and colors, as well as optical spectra of selected sources, and compare them to the X-ray properties. We discuss the nature of the underlying AGN populations, and implications for obscuration in AGN.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.