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Date and Time of the Query: 2019-04-22 T13:14:09 PDT
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For refcode 2001ApJ...551L...9C:
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2001ApJ...551L...9C Detecting High-Redshift Evolved Galaxies as the Hosts of Optically Faint Hard X-Ray Sources L. L. Cowie, A. J. Barger, M. W. Bautz, P. Capak, C. S. Crawford, A. C. Fabian, E. M. Hu, F. Iwamuro, J.-P. Kneib, T. Maihara, and K. Motohara Received 2001 January 2; accepted 2001 February 14; published 2001 April 4 ABSTRACT We combine deep Subaru near-infrared images of the massive lensing clusters A2390 and A370 with Keck optical data to map the spectral energy distributions (SEDs) of Chandra X-ray sources lying behind the clusters. The three sources behind A2390 are found to have extremely red colors with SEDs consistent with evolved galaxies at redshifts z > 1.4. One source has extremely anomalous colors, which we interpret as evidence for a type Sa SED at a redshift around 2.5. The photometric redshift of another source has been confirmed at z = 1.467 from near-infrared spectroscopy using the Cooled Infrared Spectrograph and Camera for OHS on Subaru. Mapping of optically faint hard X-ray sources may prove to be an extremely efficient way to locate luminous evolved galaxies at high redshifts. Subject headings: cosmology: observations-galaxies: active-galaxies: distances and redshifts-galaxies: evolution-galaxies: formation-galaxies: starburst
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