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Published November 2013 | Published + Submitted
Journal Article Open

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


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


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