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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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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.