CaltechAUTHORS
Published November 2013 | Version Published + Submitted
Journal Article Open

A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC 0156-252

Creators

  • 1. ROR icon Jet Propulsion Lab
  • 2. ROR icon European Southern Observatory
  • 3. ROR icon Max Planck Institute for Extraterrestrial Physics
  • 4. ROR icon University of Nottingham
  • 5. ROR icon National Observatory
  • 6. ROR icon The University of Texas at Austin
  • 7. ROR icon California Institute of Technology
  • 8. ROR icon Astronomy and Space

Abstract

We present the spectroscopic confirmation of a structure of galaxies surrounding the radio galaxy MRC 0156-252 at z = 2.02. The structure was initially discovered as an overdensity of both near-infrared selected z > 1.6 and mid-infrared selected z > 1.2 galaxy candidates. We used the VLT/FORS2 multi-object spectrograph to target ~80 high-redshift galaxy candidates, and obtain robust spectroscopic redshifts for more than half the targets. The majority of the confirmed sources are star-forming galaxies at z > 1.5. In addition to the radio galaxy, two of its close-by companions (<6″) also show AGN signatures. Ten sources, including the radio galaxy, lie within | z − 2.020 | <0.015 (i.e., velocity offsets <1500 km s^-1) and within projected 2 Mpc comoving of the radio galaxy. Additional evidence suggests not only that the galaxy structure associated with MRC 0156-252 is a forming galaxy cluster but also that this structure is most probably embedded in a larger-scale structure.

Additional Information

© 2013 ESO. Article published by EDP Sciences. Received 23 July 2013; accepted 25 September 2013. Published online 28 October 2013. Based on observations obtained at the European Southern Observatory using the Very Large Telescope on Cerro Paranal through ESO programme 090.A-0734 (P.I. A. Galametz).

Attached Files

Published - aa22345-13.pdf

Submitted - 1309.6645v3.pdf

Files

1309.6645v3.pdf

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Additional details

Identifiers

Eprint ID
43746
Resolver ID
CaltechAUTHORS:20140210-115733449

Related works

Describes
http://arxiv.org/abs/1309.6645 (URL)

Dates

Created
2014-02-10
Created from EPrint's datestamp field
Updated
2021-11-10
Created from EPrint's last_modified field