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The STAGES view of red spirals and dusty red galaxies: mass-dependent quenching of star formation in cluster infall
Authors:Christian Wolf  Alfonso Aragón-Salamanca  Michael Balogh  Marco Barden  Eric F Bell  Meghan E Gray  Chien Y Peng  David Bacon  Fabio D Barazza  Asmus Böhm  John A R Caldwell  Anna Gallazzi  Boris Häußler  Catherine Heymans  Knud Jahnke  Shardha Jogee  Eelco van Kampen  Kyle Lane  Daniel H McIntosh  Klaus Meisenheimer  Casey Papovich  Sebastian F Sánchez  y Taylor  Lutz Wisotzki  Xianzhong Zheng
Institution:Department of Astrophysics, Denys Wilkinson Building, University of Oxford, Keble Road, Oxford OX1 3RH;School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD;Department of Physics and Astronomy, University Of Waterloo, Waterloo, Ontario N2L 3G1, Canada;Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25/8, A-6020 Innsbruck, Austria;Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany;NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria V9E 2E7, Canada;Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA;Institute of Cosmology and Gravitation, University of Portsmouth, Hampshire Terrace, Portsmouth PO1 2EG;Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland;Astrophysikalisches Insitut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany;University of Texas, McDonald Observatory, Fort Davis, TX 79734, USA;Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver V6T 1Z1, Canada;The Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Department of Astronomy, University of Texas at Austin, 1 University Station, C1400 Austin, TX 78712-0259, USA;Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA;Department of Physics, 5110 Rockhill Road, University of Missouri-Kansas City, Kansas City, MO 64110, USA;Department of Physics, Texas A&M University, College Station, TX 77843, USA;Centro Hispano Aleman de Calar Alto, C/Jesus Durban Remon 2-2, E-04004 Almeria, Spain;Purple Mountain Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210008, PR China
Abstract:We investigate the properties of optically passive spirals and dusty red galaxies in the A901/2 cluster complex at redshift ~0.17 using rest-frame near-ultraviolet–optical spectral energy distributions, 24-μm infrared data and Hubble Space Telescope morphologies from the STAGES data set. The cluster sample is based on COMBO-17 redshifts with an rms precision of  σ cz ≈ 2000 km s?1  . We find that 'dusty red galaxies' and 'optically passive spirals' in A901/2 are largely the same phenomenon, and that they form stars at a substantial rate, which is only four times lower than that in blue spirals at fixed mass. This star formation is more obscured than in blue galaxies and its optical signatures are weak. They appear predominantly in the stellar mass range of  log  M */M=10, 11]  where they constitute over half of the star-forming galaxies in the cluster; they are thus a vital ingredient for understanding the overall picture of star formation quenching in clusters. We find that the mean specific star formation rate (SFR) of star-forming galaxies in the cluster is clearly lower than in the field, in contrast to the specific SFR properties of blue galaxies alone, which appear similar in cluster and field. Such a rich red spiral population is best explained if quenching is a slow process and morphological transformation is delayed even more. At  log  M */M < 10  , such galaxies are rare, suggesting that their quenching is fast and accompanied by morphological change. We note that edge-on spirals play a minor role; despite being dust reddened they form only a small fraction of spirals independent of environment.
Keywords:surveys  stars: formation  galaxies: clusters: general  galaxies: evolution  galaxies: spiral  infrared: galaxies
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