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

Galametz, Audrey and Stern, Daniel and Pentericci, Laura and de Breuck, Carlos and Vernet, Joël and Wylezalek, Dominika and Fassbender, Rene and Hatch, Nina and Kurk, Jaron and Overzier, Roderik and Rettura, Alessandro and Seymour, Nick (2013) A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC 0156-252. Astronomy and Astrophysics, 559 . Art. No. A2. ISSN 0004-6361.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper A: Spectroscopic redshifts
Stern, Daniel0000-0003-2686-9241
de Breuck, Carlos0000-0002-6637-3315
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).
Subject Keywords:galaxies: clusters: general; galaxies: clusters: individual: MRC 0156-252; large-scale structure of Universe; galaxies: individual: MRC 0156-252
Record Number:CaltechAUTHORS:20140210-115733449
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Official Citation:A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC 0156-252 Audrey Galametz, Daniel Stern, Laura Pentericci, Carlos De Breuck, Joël Vernet, Dominika Wylezalek, Rene Fassbender, Nina Hatch, Jaron Kurk, Roderik Overzier, Alessandro Rettura and Nick Seymour A&A 559 A2 (2013) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43746
Deposited By: Jason Perez
Deposited On:10 Feb 2014 23:52
Last Modified:03 Oct 2019 06:10

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