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Comparing the Relation Between Star Formation and Galaxy Mass in Different Environments

Vulcani, Benedetta and Poggianti, Bianca M. and Finn, Rose A. and Rudnick, Gregory and Desai, Vandana and Bamford, Steven (2010) Comparing the Relation Between Star Formation and Galaxy Mass in Different Environments. Astrophysical Journal Letters, 710 (1). L1-L6. ISSN 2041-8205.

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Analyzing 24 μm MIPS/Spitzer data and the [O II]3727 line of a sample of galaxies at 0.4 ≤ z ≤ 0.8 from the ESO Distant Cluster Survey, we investigate the ongoing star formation rate (SFR) and the specific star formation rate (SSFR) as a function of stellar mass in galaxy clusters and groups, and compare these with results from field studies. As for the field, we find a decline in SFR with time, indicating that star formation (SF) was more active in the past, and a decline in SSFR as galaxy stellar mass increases, showing that the current SF contributes more to the fractional growth of low-mass galaxies than high-mass galaxies. However, we find a lower median SFR (by a factor of ~1.5) in cluster star-forming galaxies than in the field. The difference is highly significant when all Spitzer and emission-line galaxies are considered, regardless of color. It remains significant at z > 0.6 after removing red emission-line galaxies, to avoid possible active galactic nucleus contamination. While there is overlap between the cluster and field SFR-mass relations, we find a population of cluster galaxies (10%-25%) with reduced SFR for their mass. These are likely to be in transition from star forming to passive. Separately comparing clusters and groups at z > 0.6, only cluster trends are significantly different from the field, and the average cluster SFR at a given mass is ~two times lower than the field. We conclude that the average SFR in star-forming galaxies varies with galaxy environment at a fixed galaxy mass.

Item Type:Article
Related URLs:
URLURL TypeDescription
Vulcani, Benedetta0000-0003-0980-1499
Poggianti, Bianca M.0000-0001-8751-8360
Finn, Rose A.0000-0001-8518-4862
Rudnick, Gregory0000-0001-5851-1856
Desai, Vandana0000-0002-1340-0543
Bamford, Steven0000-0001-7821-7195
Additional Information:© 2010 The American Astronomical Society. Received 2009 October 20; accepted 2009 December 4; published 2010 January 19. We thank the anonymous referee for his/her useful remarks. We thank Kai Noeske and the AEGIS collaboration for providing us their data and support.We acknowledge financial support from ASI contract I/016/07/0.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/016/07/0
Subject Keywords:galaxies: clusters: general – galaxies: evolution – galaxies: formation
Issue or Number:1
Record Number:CaltechAUTHORS:20100301-095548014
Persistent URL:
Official Citation:Comparing the Relation Between Star Formation and Galaxy Mass in Different Environments Benedetta Vulcani, Bianca M. Poggianti, Rose A. Finn, Gregory Rudnick, Vandana Desai, and Steven Bamford 2010 ApJ 710 L1-L6 doi: 10.1088/2041-8205/710/1/L1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17614
Deposited By: Tony Diaz
Deposited On:02 Mar 2010 17:43
Last Modified:09 Mar 2020 13:19

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