Maschietto, F. and Hatch, N. A. and Venemans, B. P. and Röttgering, H. J. A. and Miley, G. K. and Overzier, R. A. and Dopita, M. A. and Eisenhardt, P. R. and Kurk, J. D. and Meurer, G. R. and Pentericci, L. and Rosati, P. and Stanford, S. A. and van Breugel, W. and Zirm, A. W. (2008) [O iii] emitters in the field of the MRC 0316–257 protocluster. Monthly Notices of the Royal Astronomical Society, 389 (3). pp. 1223-1232. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:FASmnras08
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Venemans et al. found evidence for an overdensity of Lyα emission-line galaxies associated with the radio galaxy MRC 0316−257 at z= 3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and active galactic nucleus (AGN) within the protocluster. Narrow-band infrared imaging was used to select candidate [O iii] emitters in a 1.1 × 1.1 Mpc^2 region around the radio galaxy. 13 candidates have been detected. Four of these are among the previously confirmed sample of Lyα galaxies, and an additional three have been confirmed through follow-up infrared spectroscopy. The three newly confirmed objects lie within a few hundred km s^−1 of each other, but are blueshifted with respect to the radio galaxy and Lyα emitters by ∼2100 km s−1. Although the sample is currently small, our results indicate that the radio-selected protocluster is forming at the centre of a larger, ∼60 comoving Mpc superstructure. On the basis of a Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) imaging study we calculate dust-corrected star formation rates and investigate morphologies and sizes of the [O iii] candidate emitters. From a comparison of the star formation rate derived from UV continuum and [O iii] emission, we conclude that at least two of the [O iii] galaxies harbour an AGN which ionized the O^+ gas.
|Additional Information:||© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 June 11. Received 2008 June 3; in original form 2008 March 26. This research is based on observations made with the VLT at ESO, Paranal, with program numbers 077.A-0310(A,B) and 078.A- 0002(A,B), and on observations made with the NASA/ESA HST, obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. NAH and GKM acknowledge funding from the Royal Netherlands Academy of Arts and Sciences.|
|Subject Keywords:||galaxies: active; galaxies: clusters: general; galaxies: evolution; cosmology: observations; early Universe|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||13 Jul 2009 17:22|
|Last Modified:||26 Dec 2012 10:54|
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