The mid-infrared environments of high-redshift radio galaxies
Taking advantage of the impressive sensitivity of Spitzer to detect massive galaxies at high redshift, we study the mid-infrared environments of powerful, high-redshift radio galaxies at 1.2 < z < 3. Galaxy cluster member candidates were isolated using a single Spitzer/IRAC mid-infrared color...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/11823 |
| _version_ | 1848747908679073792 |
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| author | Galametz, A. Stern, D. De Breuck, C. Hatch, N. Mayo, J. Miley, G. Rettura, A. Seymour, Nick Adam Stanford, S. Vernet, J. |
| author_facet | Galametz, A. Stern, D. De Breuck, C. Hatch, N. Mayo, J. Miley, G. Rettura, A. Seymour, Nick Adam Stanford, S. Vernet, J. |
| author_sort | Galametz, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Taking advantage of the impressive sensitivity of Spitzer to detect massive galaxies at high redshift, we study the mid-infrared environments of powerful, high-redshift radio galaxies at 1.2 < z < 3. Galaxy cluster member candidates were isolated using a single Spitzer/IRAC mid-infrared color criterion, [3.6]-[4.5] > –0.1 (AB), in the fields of 48 radio galaxies at 1.2 < z < 3. Using a counts-in-cell analysis, we identify a field as overdense when 15 or more red IRAC sources are found within 1' (i.e., 0.5 Mpc at 1.2 < z < 3) of the radio galaxy to the 5σ flux density limits of our IRAC data (f 4.5 = 13.4 μJy). We find that radio galaxies lie preferentially in medium to dense regions, with 73% of the targeted fields denser than average. Our (shallow) 120 s data permit the rediscovery of previously known clusters and protoclusters associated with radio galaxies as well as the discovery of new promising galaxy cluster candidates at z > 1.2. |
| first_indexed | 2025-11-14T06:56:37Z |
| format | Journal Article |
| id | curtin-20.500.11937-11823 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:56:37Z |
| publishDate | 2012 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-118232023-02-22T06:24:16Z The mid-infrared environments of high-redshift radio galaxies Galametz, A. Stern, D. De Breuck, C. Hatch, N. Mayo, J. Miley, G. Rettura, A. Seymour, Nick Adam Stanford, S. Vernet, J. Taking advantage of the impressive sensitivity of Spitzer to detect massive galaxies at high redshift, we study the mid-infrared environments of powerful, high-redshift radio galaxies at 1.2 < z < 3. Galaxy cluster member candidates were isolated using a single Spitzer/IRAC mid-infrared color criterion, [3.6]-[4.5] > –0.1 (AB), in the fields of 48 radio galaxies at 1.2 < z < 3. Using a counts-in-cell analysis, we identify a field as overdense when 15 or more red IRAC sources are found within 1' (i.e., 0.5 Mpc at 1.2 < z < 3) of the radio galaxy to the 5σ flux density limits of our IRAC data (f 4.5 = 13.4 μJy). We find that radio galaxies lie preferentially in medium to dense regions, with 73% of the targeted fields denser than average. Our (shallow) 120 s data permit the rediscovery of previously known clusters and protoclusters associated with radio galaxies as well as the discovery of new promising galaxy cluster candidates at z > 1.2. 2012 Journal Article http://hdl.handle.net/20.500.11937/11823 10.1088/0004-637X/749/2/169 unknown |
| spellingShingle | Galametz, A. Stern, D. De Breuck, C. Hatch, N. Mayo, J. Miley, G. Rettura, A. Seymour, Nick Adam Stanford, S. Vernet, J. The mid-infrared environments of high-redshift radio galaxies |
| title | The mid-infrared environments of high-redshift radio galaxies |
| title_full | The mid-infrared environments of high-redshift radio galaxies |
| title_fullStr | The mid-infrared environments of high-redshift radio galaxies |
| title_full_unstemmed | The mid-infrared environments of high-redshift radio galaxies |
| title_short | The mid-infrared environments of high-redshift radio galaxies |
| title_sort | mid-infrared environments of high-redshift radio galaxies |
| url | http://hdl.handle.net/20.500.11937/11823 |