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Title:
Obscured Star Formation in Intermediate-Density Environments: A Spitzer Study of the Abell 901/902 Supercluster
Authors:
Gallazzi, Anna; Bell, Eric F.; Wolf, Christian; Gray, Meghan E.; Papovich, Casey; Barden, Marco; Peng, Chien Y.; Meisenheimer, Klaus; Heymans, Catherine; van Kampen, Eelco; Gilmour, Rachel; Balogh, Michael; McIntosh, Daniel H.; Bacon, David; Barazza, Fabio D.; Böhm, Asmus; Caldwell, John A. R.; Häußler, Boris; Jahnke, Knud; Jogee, Shardha; Lane, Kyle; Robaina, Aday R.; Sanchez, Sebastian F.; Taylor, Andy; Wisotzki, Lutz; Zheng, Xianzhong
Affiliation:
AA(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ), AB(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ), AC(Department of Physics, Denys Wilkinson Bldg., University of Oxford, Keble Road, Oxford, OX1 3RH, UK ), AD(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK ), AE(Department of Physics Texas A & M University College Station, TX 77843, USA ), AF(Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25/8, A-6020 Innsbruck, Austria ), AG(NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria V9E 2E7, Canada ), AH(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ), AI(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver V6T 1Z1, Canada ), AJ(Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25/8, A-6020 Innsbruck, Austria ), AK(European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile ), AL( Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada ), AM(Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA ), AN(Institute of Cosmology and Gravitation, University of Portsmouth, Hampshire Terrace, Portsmouth PO1 2EG, UK ), AO(Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, CH-1290 Sauverny, Switzerland ), AP(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany ), AQ(University of Texas, McDonald Observatory, Fort Davis, TX 79734, USA ), AR(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK ), AS(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ), AT(Department of Astronomy, University of Texas at Austin, 1 University Station, C1400 Austin, TX 78712-0259, USA ), AU(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK ), AV(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ), AW(Centro Hispano Aleman de Calar Alto, C/Jesus Durban Remon 2-2, E-04004 Almeria, Spain ), AX(The Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK ), AY(Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, CH-1290 Sauverny, Switzerland ), AZ(Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China)
Publication:
The Astrophysical Journal, Volume 690, Issue 2, pp. 1883-1900 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
galaxies: evolution, galaxies: general, galaxies: stellar content
DOI:
10.1088/0004-637X/690/2/1883
Bibliographic Code:
2009ApJ...690.1883G

Abstract

We explore the amount of obscured star formation as a function of environment in the Abell 901/902 (A901/902) supercluster at z = 0.165 in conjunction with a field sample drawn from the A901 and CDFS fields, imaged with the Hubble Space Telescope as part of the Space Telescope A901/902 Galaxy Evolution Survey and Galaxy Evolution from Morphology and Spectral Energy Distributions (SEDs) Survey. We combine the COMBO-17 near-UV/optical SED with Spitzer 24 μ photometry to estimate both the unobscured and obscured star formation in galaxies with M * > 1010 M sun. We find that the star formation activity in massive galaxies is suppressed in dense environments, in agreement with previous studies. Yet, nearly 40% of the star-forming (SF) galaxies have red optical colors at intermediate and high densities. These red systems are not starbursting; they have star formation rates (SFRs) per unit stellar mass similar to or lower than blue SF galaxies. More than half of the red SF galaxies have low infrared-to-ultraviolet (IR-to-UV) luminosity ratios, relatively high Sérsic indices, and they are equally abundant at all densities. They might be gradually quenching their star formation, possibly but not necessarily under the influence of gas-removing environmental processes. The other gsim40% of the red SF galaxies have high IR-to-UV luminosity ratios, indicative of high dust obscuration. They have relatively high specific SFRs and are more abundant at intermediate densities. Our results indicate that while there is an overall suppression in the SF galaxy fraction with density, the small amount of star formation surviving the cluster environment is to a large extent obscured, suggesting that environmental interactions trigger a phase of obscured star formation, before complete quenching.
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