AAS 207th Meeting, 8-12 January 2006
Session 80 Evolution of Galaxies, Galaxies Surveys II
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[80.21] EXOs and Obscured AGN in the MUSYC Survey

C. M. Urry, S. N. Virani, J. Van Duyne, E. Treister (Yale Univ.), E. Taylor (Leiden Univ.), E. Gawiser, P. van Dokkum (Yale Univ.), MUSYC Collaboration

With its deep near-infrared imaging, the MUltiwavelength Survey by Yale-Chile (MUSYC) is ideal for finding EXOs, i.e., objects with Extreme X-ray to Optical flux ratios. Defining an EXO as an X-ray source with no optical counterpart down to R~27 but a reasonably bright K-band counterpart (K<22 AB), EXOs are very red with R-K >5. We describe 7 EXOs found in the Extended Chandra Deep Field-South (ECDFS), a wide-deep public survey with area ~1100 square arcminutes (~0.3 deg2) and depth ~228 ks. Our X-ray catalog reaches X-ray fluxes of ~1.7 x 10-16 erg cm-2 s-1 and ~3.9 x 10-16 erg cm-2 s-1 in the 0.5--2.0 keV and 2.0--8.0 keV bands, respectively, and our optical and near-IR imaging reaches R=27 (AB) and K=23 (AB, central area; K=22 over full area). The 7 EXOs discovered in the ECDFS may be dusty galaxies at z~2-3, or quasars at z>6, or unusually faint galaxies at low redshift. We describe fits to the multi-band SEDs and compare to EXOs found in other deep X-ray surveys.

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The author(s) of this abstract have provided an email address for comments about the abstract: meg.urry@yale.edu

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