The CARLA Survey: Insights from the densest CARLA structures at 1.4 < z < 2.8
| Main Authors: | Noirot, Gaël, Stern, Daniel, Wylezalek, Dominika, Cooke, Elizabeth A., Mei, Simona, De Breuck, Carlos, Vernet, Joël, Brodwin, Mark, Eisenhardt, Peter, Galametz, Audrey, Gonzalez, Anthony H., Hatch, Nina A., Jarvis, Matt, Rettura, Alessandro, Seymour, Nick, Stanford, S. A. |
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| Format: | info Proceeding Journal |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/809356 |
Daftar Isi:
- Contributed talk presented at the conference Galaxy Evolution Across Time, 12-16 June 2017, Paris, France. Radio-loud AGN (RLAGN) tend to reside in the most massive dark matter halos, and have a long history of being used to efficiently identify rich high-z structures (i.e., clusters and protoclusters). Our team contributed to this effort with a targeted 400hr Spitzer program surveying 420 RLAGN (radio-loud quasars and high-z radio galaxies) at z=1.3−3.2 across the full sky: Clusters Around RLAGN (CARLA; Wylezalek+2013,2014). The CARLA Survey identified 200 cluster candidates at z=1.3−3.2 as 2−8σ overdensities of red color-selected Spitzer/IRAC galaxies around the targeted powerful RLAGN. We present results from our follow-up 40-orbit HST program on the 20 densest CARLA cluster candidates at z=1.4−2.8 (Noirot+2016,2017). We spectroscopically confirm 16/20 distant structures associated with the RLAGN, up to z=2.8. For the first time at these redshifts, we statistically investigate the star-formation content of a large sample of galaxies in dense structures. We show that >10^(10) M⊙ cluster galaxies form significantly fewer stars than their field star-forming counterparts at all redshifts within 1.4 ≤ z ≤ 2. This survey represents a unique and large homogenous sample of spectroscopically confirmed clusters at high redshifts, ideal to investigate quenching mechanisms in dense environments.