X-Ray Detection of an Obscured Active Galactic Nucleus in a z=3.09 Radio-quiet Ly-alpha Nebula

Abstract

We present evidence for a highly obscured X-ray source in one of two giant Ly-alpha emission nebulae in the z=3.09 proto-cluster region SSA22. Neither Ly-alpha nebula is associated with significant radio emission. While one has a significant submillimeter detection and is undetected in the X-ray, the other is a factor of 2-10 times less submillimeter bright and appears to contain a hard-band X-ray source. We discuss our analysis and techniques for assessing the X-ray properties of this source and suggest that we have detected an embedded AGN source in one of these nebulae which may be at least partially responsible for exciting the Ly-alpha emission through a mechanism that is essentially decoupled from the radio, submillimeter, or optical luminosities. We also present an upper limit on the mean X-ray emission from 10 other extended Ly-alpha objects in the SSA22 region.

arXiv comment12 pages, 3 figures, accepted to appear in ApJL, Vol. 615, 2004 November 10

References in corpus (12)

• Lyman Alpha Imaging of a Proto-Cluster Region at <z>=3.09
• A Large Structure of Galaxies At Redshift z~3 and its Cosmological Implications
• A Subaru Search for Ly-alpha Blobs in and around the Proto-cluster Region at Redshift z=3.1
• The Density of Lyman-alpha Emitters at Very High Redshift
• The Fall of AGN and the Rise of Star-Forming Galaxies: A Close Look at the Chandra Deep Field X-ray Number Counts
• Giant Lya nebulae associated with high redshift radio galaxies
• A Group of Galaxies at Redshift 2.38
• An excess of submm sources near 4C41.17: a candidate proto-cluster at z=3.8?
• Sub-mm imaging of a proto-cluster region at z=3.09
• Further multiwavelength observations of the SSA22 Ly_alpha emitting `blob'
• A deep Chandra observation of the cluster environment of the z=1.786 radio galaxy 3C294
• Extended X-ray emission around 4C 41.17 at z=3.8

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