Detecting high redshift evolved galaxies as the hosts of optically faint hard X-ray sources
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 CISCO spectrograph 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.
Keywords
Cite
@article{arxiv.astro-ph/0102306,
title = {Detecting high redshift evolved galaxies as the hosts of optically faint hard X-ray sources},
author = {L. L. Cowie and A. J. Barger and M. W. Bautz and P. Capak and C. S. Crawford and A. C. Fabian and E. M. Hu and F. Iwamuro and J. -P. Kneib and T. Maihara and K. Motohara},
journal= {arXiv preprint arXiv:astro-ph/0102306},
year = {2009}
}
Comments
5 pages, ApJ Letters, in press