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The Environmental Dependence of the Evolving S0 Fraction

Just, Dennis W. and Zaritsky, Dennis and Sand, David J. and Desai, Vandana and Rudnick, Gregory (2010) The Environmental Dependence of the Evolving S0 Fraction. Astrophysical Journal, 711 (1). pp. 192-200. ISSN 0004-637X.

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We re-investigate the dramatic rise in the S0 fraction, f_(S0), within clusters since z ~ 0.5. In particular, we focus on the role of the global galaxy environment on f_(S0) by compiling, either from our own observations or the literature, robust line-of-sight velocity dispersions, σ's, for a sample of galaxy groups and clusters at 0.1 < z < 0.8 that have uniformly determined, published morphological fractions. We find that the trend of f_(S0) with redshift is twice as strong for σ < 750 km s^(–1) groups/poor clusters than for higher-σ, rich clusters. From this result, we infer that over this redshift range galaxy-galaxy interactions, which are more effective in lower-σ environments, are more responsible for transforming spiral galaxies into S0's than galaxy-environment processes, which are more effective in higher-σ environments. The rapid, recent growth of the S0 population in groups and poor clusters implies that large numbers of progenitors exist in low-σ systems at modest redshifts (~0.5), where morphologies and internal kinematics are within the measurement range of current technology.

Item Type:Article
Related URLs:
URLURL TypeDescription
Just, Dennis W.0000-0001-8580-630X
Zaritsky, Dennis0000-0002-5177-727X
Sand, David J.0000-0003-4102-380X
Desai, Vandana0000-0002-1340-0543
Rudnick, Gregory0000-0001-5851-1856
Additional Information:© 2010 The American Astronomical Society. Received 2009 July 23; accepted 2010 January 13; published 2010 February 9. We thank the anonymous referee for insightful comments that improved the content and presentation of this paper. D.J. thanks Michael Cooper for useful conversations and Daniel Christlein for helping with the Magellan observations. D.Z. acknowledges financial support for thiswork fromNASA LTSA award NNG05GE82G, NASA XMM grants NNX06AG39A, NNX06AE41G, and NASA Spitzer grant 1344985. D.Z. also thanks the NYU Physics Department and CCPP for their hospitality during his visit.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: clusters: general – galaxies: evolution – galaxies: groups: general
Issue or Number:1
Record Number:CaltechAUTHORS:20100301-132823527
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Official Citation:The Environmental Dependence of the Evolving S0 Fraction Dennis W. Just, Dennis Zaritsky, David J. Sand, Vandana Desai, and Gregory Rudnick 2010 ApJ 711 192-200 doi: 10.1088/0004-637X/711/1/192
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17618
Deposited By: Tony Diaz
Deposited On:02 Mar 2010 17:36
Last Modified:28 Oct 2019 20:20

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