Searching for large-scale structures around high-redshift radio galaxies with Herschel

This paper presents the first results of a far-infrared search for protocluster-associated galaxy overdensities using the Spectral and Photometric Imaging REciever (SPIRE) instrument on-board the Herschel Space Observatory. Large (∼400 arcmin2) fields surrounding 26 powerful high-redshift radio gala...

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Main Authors:	Rigby, E.E., Hatch, Nina A., Rottgering, H.J.A., Sibthorpe, B., Chiang, Y.K., Overzier, R., Herbonnet, R., Borgani, S., Clements, D.L., Dannerbauer, H., De Breuck, C., De Lucia, G., Kurk, J., Maschietto, F., Miley, G., Saro, A., Seymour, N., Venemans, B.
Format:	Article
Language:	English
Published:	Oxford University Press 2014
Online Access:	http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/1/MNRAS-2014-Rigby-1882-93.pdf

id	nottingham-37217
recordtype	eprints
spelling	nottingham-372172017-10-16T09:40:02Z http://eprints.nottingham.ac.uk/37217/ Searching for large-scale structures around high-redshift radio galaxies with Herschel Rigby, E.E. Hatch, Nina A. Rottgering, H.J.A. Sibthorpe, B. Chiang, Y.K. Overzier, R. Herbonnet, R. Borgani, S. Clements, D.L. Dannerbauer, H. De Breuck, C. De Lucia, G. Kurk, J. Maschietto, F. Miley, G. Saro, A. Seymour, N. Venemans, B. This paper presents the first results of a far-infrared search for protocluster-associated galaxy overdensities using the Spectral and Photometric Imaging REciever (SPIRE) instrument on-board the Herschel Space Observatory. Large (∼400 arcmin2) fields surrounding 26 powerful high-redshift radio galaxies (2.0 < z < 4.1; L500 MHz > 1028.5 WHz−1) are mapped at 250, 350 and 500 μm to give a unique wide-field sample. On average, the fields have a higher than expected, compared to blank fields, surface density of 500 μm sources within 6 comoving Mpc of the radio galaxy. The analysis is then restricted to potential protocluster members only, which are identified using a far-infrared colour selection; this reveals significant overdensities of galaxies in two fields, neither of which are previously known protoclusters. The probability of finding two overdensities of this size by chance, given the number of fields observed, is 5 × 10−4. Overdensities here exist around radio galaxies with L500 MHz ≳ 1029 WHz−1 and z < 3. The radial extent of the average far-infrared overdensity is found to be ∼6 comoving Mpc. Comparison with predictions from numerical simulations shows that the overdensities are consistent with having masses >1014 M⊙. However, the large uncertainty in the redshift estimation means that it is possible that these far-infrared overdensities consist of several structures across the redshift range searched. Oxford University Press 2014-01-11 Article PeerReviewed application/pdf en http://eprints.nottingham.ac.uk/37217/1/MNRAS-2014-Rigby-1882-93.pdf Rigby, E.E. and Hatch, Nina A. and Rottgering, H.J.A. and Sibthorpe, B. and Chiang, Y.K. and Overzier, R. and Herbonnet, R. and Borgani, S. and Clements, D.L. and Dannerbauer, H. and De Breuck, C. and De Lucia, G. and Kurk, J. and Maschietto, F. and Miley, G. and Saro, A. and Seymour, N. and Venemans, B. (2014) Searching for large-scale structures around high-redshift radio galaxies with Herschel. Monthly Notices of the Royal Astronomical Society, 437 (2). pp. 1882-1893. ISSN 1365-2966 http://mnras.oxfordjournals.org/content/437/2/1882 doi:10.1093/mnras/stt2019 doi:10.1093/mnras/stt2019
repository_type	Digital Repository
institution_category	Local University
institution	University of Nottingham Malaysia Campus
building	Nottingham Research Data Repository
collection	Online Access
language	English
description	This paper presents the first results of a far-infrared search for protocluster-associated galaxy overdensities using the Spectral and Photometric Imaging REciever (SPIRE) instrument on-board the Herschel Space Observatory. Large (∼400 arcmin2) fields surrounding 26 powerful high-redshift radio galaxies (2.0 < z < 4.1; L500 MHz > 1028.5 WHz−1) are mapped at 250, 350 and 500 μm to give a unique wide-field sample. On average, the fields have a higher than expected, compared to blank fields, surface density of 500 μm sources within 6 comoving Mpc of the radio galaxy. The analysis is then restricted to potential protocluster members only, which are identified using a far-infrared colour selection; this reveals significant overdensities of galaxies in two fields, neither of which are previously known protoclusters. The probability of finding two overdensities of this size by chance, given the number of fields observed, is 5 × 10−4. Overdensities here exist around radio galaxies with L500 MHz ≳ 1029 WHz−1 and z < 3. The radial extent of the average far-infrared overdensity is found to be ∼6 comoving Mpc. Comparison with predictions from numerical simulations shows that the overdensities are consistent with having masses >1014 M⊙. However, the large uncertainty in the redshift estimation means that it is possible that these far-infrared overdensities consist of several structures across the redshift range searched.
format	Article
author	Rigby, E.E. Hatch, Nina A. Rottgering, H.J.A. Sibthorpe, B. Chiang, Y.K. Overzier, R. Herbonnet, R. Borgani, S. Clements, D.L. Dannerbauer, H. De Breuck, C. De Lucia, G. Kurk, J. Maschietto, F. Miley, G. Saro, A. Seymour, N. Venemans, B.
spellingShingle	Rigby, E.E. Hatch, Nina A. Rottgering, H.J.A. Sibthorpe, B. Chiang, Y.K. Overzier, R. Herbonnet, R. Borgani, S. Clements, D.L. Dannerbauer, H. De Breuck, C. De Lucia, G. Kurk, J. Maschietto, F. Miley, G. Saro, A. Seymour, N. Venemans, B. Searching for large-scale structures around high-redshift radio galaxies with Herschel
author_facet	Rigby, E.E. Hatch, Nina A. Rottgering, H.J.A. Sibthorpe, B. Chiang, Y.K. Overzier, R. Herbonnet, R. Borgani, S. Clements, D.L. Dannerbauer, H. De Breuck, C. De Lucia, G. Kurk, J. Maschietto, F. Miley, G. Saro, A. Seymour, N. Venemans, B.
author_sort	Rigby, E.E.
title	Searching for large-scale structures around high-redshift radio galaxies with Herschel
title_short	Searching for large-scale structures around high-redshift radio galaxies with Herschel
title_full	Searching for large-scale structures around high-redshift radio galaxies with Herschel
title_fullStr	Searching for large-scale structures around high-redshift radio galaxies with Herschel
title_full_unstemmed	Searching for large-scale structures around high-redshift radio galaxies with Herschel
title_sort	searching for large-scale structures around high-redshift radio galaxies with herschel
publisher	Oxford University Press
publishDate	2014
url	http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/ http://eprints.nottingham.ac.uk/37217/1/MNRAS-2014-Rigby-1882-93.pdf
first_indexed	2018-09-06T12:45:50Z
last_indexed	2018-09-06T12:45:50Z
_version_	1610862244838506496

Searching for large-scale structures around high-redshift radio galaxies with Herschel

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