dc.contributor.author | Wylezalek, D. | |
dc.contributor.author | Galametz, A. | |
dc.contributor.author | Stern, D. | |
dc.contributor.author | Vernet, J. | |
dc.contributor.author | De Breuck, C. | |
dc.contributor.author | Seymour, N. | |
dc.contributor.author | Brodwin, M. | |
dc.contributor.author | Eisenhardt, P.R.M. | |
dc.contributor.author | Gonzalez, A.H. | |
dc.contributor.author | Hatch, N. | |
dc.contributor.author | Jarvis, M.J. | |
dc.contributor.author | Rettura, A. | |
dc.contributor.author | Stanford, S. A. | |
dc.contributor.author | Stevens, J.A. | |
dc.date.accessioned | 2014-01-27T10:00:34Z | |
dc.date.available | 2014-01-27T10:00:34Z | |
dc.date.issued | 2013-05-01 | |
dc.identifier.citation | Wylezalek , D , Galametz , A , Stern , D , Vernet , J , De Breuck , C , Seymour , N , Brodwin , M , Eisenhardt , P R M , Gonzalez , A H , Hatch , N , Jarvis , M J , Rettura , A , Stanford , S A & Stevens , J A 2013 , ' Galaxy Clusters around Radio-loud Active Galactic Nuclei at 1.3 lt z lt 3.2 as seen by Spitzer ' , The Astrophysical Journal , vol. 769 , no. 1 , 79 . https://doi.org/10.1088/0004-637X/769/1/79 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | Bibtex: urn:9cba55d10e45b3333ac5e4f7b4ce9a8f | |
dc.identifier.other | ORCID: /0000-0002-4010-8310/work/62747546 | |
dc.identifier.uri | http://hdl.handle.net/2299/12671 | |
dc.description.abstract | We report the first results from the Clusters Around Radio-Loud AGN program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate the environments of a large sample of obscured and unobscured luminous radio-loud active galactic nuclei (AGNs) at 1.2 < z < 3.2. These data, obtained for 387 fields, reach 3.6 and 4.5 μm depths of [3.6]AB = 22.6 and [4.5]AB = 22.9 at the 95% completeness level, which is two to three times fainter than L* in this redshift range. By using the color cut [3.6] – [4.5] > –0.1 (AB), which efficiently selects high-redshift (z > 1.3) galaxies of all types, we identify galaxy cluster member candidates in the fields of the radio-loud AGN. The local density of these Infrared Array Camera (IRAC)-selected sources is compared to the density of similarly selected sources in blank fields. We find that 92% of the radio-loud AGN reside in environments richer than average. The majority (55%) of the radio-loud AGN fields are found to be overdense at a ≥2σ level; 10% are overdense at a ≥5σ level. A clear rise in surface density of IRAC-selected sources toward the position of the radio-loud AGN strongly supports an association of the majority of the IRAC-selected sources with the radio-loud AGN. Our results provide solid statistical evidence that radio-loud AGN are likely beacons for finding high-redshift galaxy (proto-)clusters. We investigate how environment depends on AGN type (unobscured radio-loud quasars versus obscured radio galaxies), radio luminosity and redshift, finding no correlation with either AGN type or radio luminosity. We find a decrease in density with redshift, consistent with galaxy evolution for this uniform, flux-limited survey. These results are consistent with expectations from the orientation-driven AGN unification model, at least for the high radio luminosity regimes considered in this sample | en |
dc.format.extent | 10 | |
dc.format.extent | 403642 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | galaxies: active, galaxies: clusters: general, galaxies: high-redshift, infrared: galaxies, techniques: photometric | |
dc.title | Galaxy Clusters around Radio-loud Active Galactic Nuclei at 1.3 lt z lt 3.2 as seen by Spitzer | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1088/0004-637X/769/1/79 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |