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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 710052.0, MPI für Astronomie / Publikationen_mpia
Searching for large-scale structures around high-redshift radio galaxies with Herschel
Authors:Rigby, E. E.; Hatch, N. A.; Röttgering, 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.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:437
Issue / Number:2
Start Page:1882
End Page:1893
Audience:Not Specified
Abstract / 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 (&tilde;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 mum to give a unique wide-field sample. On average, the fields have a higher than expected, compared to blank fields, surface density of 500 mum 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 &gsim; 1029 WHz-1 and z < 3. The radial extent of the average far-infrared overdensity is found to be &tilde;6 comoving Mpc. Comparison with predictions from numerical simulations shows that the overdensities are consistent with having masses >1014 M&sun;. 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.
Free Keywords:galaxies: clusters: general; galaxies: general; galaxies: high-redshift; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stt2019
URL:http://cdsads.u-strasbg.fr/abs/2014MNRAS.437.1882R
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