EXOs and Obscured AGN in the MUSYC Survey

Details EXOs and Obscured AGN in the MUSYC Survey EXOs and Obscured AGN in the MUSYC Survey

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.8021u&link_type=abstract

American Astronomical Society Meeting 207, #80.21; Bulletin of the American Astronomical Society, Vol. 37, p.1300

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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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