Clustering of star-forming galaxies near a radio galaxy at z = 5.2 1

Roderik A. Overzier, G. K. Miley, R. J. Bouwens, N. J.G. Cross, A. W. Zirm, N. Benítez, J. P. Blakeslee, M. Clampin, R. Demarco, H. C. Ford, G. F. Hartig, G. D. Illingworth, A. R. Martel, H. J.A. Röttgering, B. Venemans, D. R. Ardila, F. Bartko, L. D. Bradley, T. J. Broadhurst, D. CoeP. D. Feldman, M. Franx, D. A. Golimowski, T. Goto, C. Gronwall, B. Holden, N. Homeier, L. Infante, R. A. Kimble, J. E. Krist, S. Mei, F. Menanteau, G. R. Meurer, V. Motta, M. Postman, P. Rosati, M. Sirianni, W. B. Sparks, H. D. Tran, Z. I. Tsvetanov, R. L. White, W. Zheng

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72 Scopus citations


We present HST ACS observations of the most distant radio galaxy known, TN J0924-2201 at z = 5.2. This radio galaxy has six spectroscopically confirmed Lyα-emitting companion galaxies and appears to lie within an overdense region. The radio galaxy is marginally resolved in i775 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 atz 4-5. The Lyα emitters are sub-L* galaxies, with deduced star formation rates of 1-10 M⊙ yr-1. One of the Lyα emitters is only detected in Lyα. Based on the star formation rate of ∼3 M⊙ yr-1 calculated from Lyα, 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 606i775z850 were used to identify additional Lyman break galaxies associated with this structure. In addition to the radio galaxy, there are 22 V606 break (z ∼ 5) galaxies with z850 < 26.5 (5 σ), two of which are also in the spectroscopic sample. We compare the surface density of ∼2 arcmin-2 to that of similarly selected V606 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 suggests that the V606 break objects are associated with a forming cluster around the radio galaxy.

Original languageEnglish (US)
Pages (from-to)58-73
Number of pages16
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jan 20 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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