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|Title:||Passive galaxies as tracers of cluster environments at z ~ 2||Authors:||Strazzullo, V.
GARILLI, BIANCA MARIA ROSA
Carollo, C. M.
Le Floc'h, E.
Lilly, S. J.
McCracken, H. J.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||576||First Page:||L6||Abstract:||Even 10 billion years ago, the cores of the first galaxy clusters are often found to host a characteristic population of massive galaxies with already suppressed star formation. Here we search for distant cluster candidates at z ~ 2 using massive passive galaxies as tracers. With a sample of ~40 spectroscopically confirmed passive galaxies at 1.3 < z < 2.1, we tuned photometric redshifts of several thousand passive sources in the 2 sq. deg COSMOS field. This allowed us to map their density in redshift slices, probing the large-scale structure in the COSMOS field as traced by passive sources. We report here on the three strongest passive galaxy overdensities that we identify in the range 1.5 < z < 2.5. While the actual nature of these concentrations still needs to be confirmed, we discuss their identification procedure and the arguments supporting them as candidate galaxy clusters (probably in the mid-10<SUP>13</SUP> M<SUB>☉</SUB> range). Although this search approach is probably biased toward more evolved structures, it has the potential of selecting still rare, cluster-like environments close to their epoch of first appearance, enabling new investigations of the evolution of galaxies in the context of structure growth.||Acknowledgments:||We thank M. Pannella and A. Saro for helpful input. V.S., E.D., R.G., and F.V. were supported by grants ERC-StG UPGAL 240039 and ANR-08-JCJC-0008. A.C. and M.M. acknowledge grants ASI n.I/023/12/0 and MIUR PRIN 2010-2011 “The dark Universe and the cosmic evolution of baryons; from current surveys to Euclid”. Based on observations from ESO Telescopes under program IDs 086.A-0681, 088.A-0671, LP175.A-0839, and 179.A-2005.||URI:||http://hdl.handle.net/20.500.12386/23233||URL:||https://www.aanda.org/articles/aa/abs/2015/04/aa25038-14/aa25038-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425038||Bibcode ADS:||2015A&A...576L...6S||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Oct 28, 2020
checked on Oct 28, 2020
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