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Spectroscopic Confirmation of a Radio-Selected Galaxy Overdensity at z=1.11 | | Daniel Stern
; Brad Holden
; S.A. Stanford
; Hyron Spinrad
; | | Date: |
10 Jun 2003 | | Journal: | Astron. J. 125 (2003), 2759-2768 | | Subject: | astro-ph | | Affiliation: | JPL/Caltech, UC-Davis and IGPP/LLNL, UC-Berkeley | | Abstract: | We report the discovery of a galaxy overdensity at z=1.11 associated with the z=1.110 high-redshift radio galaxy MG0442+0202. The group, CL0442+0202, was found in a near-infrared survey of z>1 radio galaxies undertaken to identify spatially-coincident regions with a high density of objects red in I-K’ color, typical of z>1 elliptical galaxies. Spectroscopic observations from the Keck telescope reveal five galaxies within 35" of MG0442+0202 at 1.10 5e-16 erg/cm2/s. One of these point sources is identified with a radio-quiet, typeII quasar at z=1.863, akin to sources recently reported in deep Chandra surveys. The limit on an extended hot intracluster medium in the Chandra data is S(1-6keV) < 1.9e-15 erg/cm2/s (3-sigma, 30" radius aperture). Though the X-ray observations do not confirm the existence of a massive, bound cluster at z>1, the success of the optical/near-infrared targeting of early-type systems near the radio galaxy validates searches using radio galaxies as beacons for high-redshift large-scale structure. We interpret CL0442+0202 to be a massive cluster in the process of formation. | | Source: | arXiv, astro-ph/0306182 | | Services: | Forum | Review | PDF | Favorites | |
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