The Filamentary Large Scale Structure around the z = 2.16 Radio Galaxy PKS 1138-262

Details The Filamentary Large Scale Structure around the z = 2.16 Radio Galaxy PKS 1138-262 The Filamentary Large Scale Structure around the z = 2.16 Radio Galaxy PKS 1138-262

2005-05-17

arxiv.org/abs/astro-ph/0505354v1

Astron.J.130:867-872,2005

Astronomy and Astrophysics

Astrophysics

16 pages, 4 figures, To appear in AJ, September 2005

Scientific paper

10.1086/431956

PKS 1138-262 is a massive radio galaxy at z = 2.16 surrounded by overdensities of Lya emitters, Ha emitters, EROs and X-ray emitters. Numerous lines of evidence exist that it is located in a forming cluster. We report on Keck spectroscopy of candidate members of this protocluster, including nine of the 18 X-ray sources detected by Pentericci et al. (2002) in this field. Two of these X-ray sources (not counting PKS 1138-262 itself) were previously confirmed to be members of the protocluster; we have discovered that an additional two (both AGN) are members of a filamentary structure, at least 3.5 Mpc in projection, aligned with the radio jet axis, the 150 kpc-sized emission-line halo, and the extended X-ray emission around the radio galaxy. Three of the nine X-ray sources observed are lower redshift AGN, and three are M-dwarf stars.

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