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Clustering of Star-forming Galaxies Near a Radio Galaxy at z=5.2 | Roderik A. Overzier
; G.K. Miley
; R.J. Bouwens
; N.J.G. Cross
; A.W. Zirm
; N. Benitez
; J.P. Blakeslee
; M. Clampin
; R. Demarco
; H.C. Ford
; G.F. Hartig
; G.D. Illingworth
; A.R. Martel
; H.J.A. Rottgering
; B. Venemans
; the ACS IDT
; | Date: |
12 Sep 2005 | Subject: | astro-ph | Abstract: | We present HST/ACS observations of the most distant radio galaxy known, TN J0924-2201 at z=5.2. This radio galaxy has 6 spectroscopically confirmed Lya emitting companion galaxies, and appears to lie within an overdense region. The radio galaxy is marginally resolved in i_775 and z_850 showing continuum emission aligned with the radio axis, similar to what is observed for lower redshift radio galaxies. Both the half-light radius and the UV star formation rate are comparable to the typical values found for Lyman break galaxies at z~4-5. The Lya emitters are sub-L* galaxies, with deduced star formation rates of 1-10 Msun/yr. One of the Lya emitters is only detected in Lya. Based on the star formation rate of ~3 Msun/yr calculated from Lya, the lack of continuum emission could be explained if the galaxy is younger than ~2 Myr and is producing its first stars. Observations in V_606, i_775, and z_850 were used to identify additional Lyman break galaxies associated with this structure. In addition to the radio galaxy, there are 22 V-break (z~5) galaxies with z_850<26.5 (5sigma), two of which are also in the spectroscopic sample. We compare the surface density of 2/arcmin^2 to that of similarly selected V-dropouts extracted from GOODS and the UDF Parallel fields. We find evidence for an overdensity to very high confidence (>99%), based on a counts-in-cells analysis applied to the control field. The excess is suggestive of the V-break objects being associated with a forming cluster around the radio galaxy. | Source: | arXiv, astro-ph/0509308 | Services: | Forum | Review | PDF | Favorites |
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