The Herschel Virgo Cluster Survey - VIII. The Bright Galaxy Sample

J.I. Davies, S. Bianchi, Luca Cortese, R. Auld, M. Baes, G.J. Bendo, A. Boselli, L. Ciesla, M. Clemens, E. Corbelli, I. De Looze, S.d.S. Alighieri, J. Fritz, G. Gavazzi, C. Pappalardo, M. Grossi, L.K. Hunt, S. Madden, L. Magrini, M. PohlenM.W.L. Smith, J. Verstappen, C. Vlahakis

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    Abstract

    We describe the Herschel Virgo Cluster Survey and the first data that cover the complete survey area (four 4 × 4 deg 2 regions). We use these data to measure and compare the global far-infrared properties of 78 optically bright galaxies that are selected at 500μm and detected in all five far-infrared bands. We show that our measurements and calibration are broadly consistent with previous data obtained by the IRAS, ISO, Spitzer and Planck. We use SPIRE and PACS photometry data to produce 100-, 160-, 250-, 350- and 500-μm cluster luminosity distributions. These luminosity distributions are not power laws, but 'peaked', with small numbers of both faint and bright galaxies. We measure a cluster 100-500μm far-infrared luminosity density of 1.6(7.0) ± 0.2 × 10 9 L ⊙Mpc -3. This compares to a cluster 0.4-2.5μm optical luminosity density of 5.0(20.0) × 10 9 L ⊙Mpc -3, some 3.2(2.9) times larger than the far-infrared. A 'typical' photon originates from an optical depth of 0.4 ± 0.1. Most of our sample galaxies are well fitted by a single modified blackbody (β= 2), leading to a mean dust mass of log M Dust= 7.31 M ⊙ and temperature of 20.0K. We also derive both stellar and atomic hydrogen masses from which we calculate mean values for the star-to-gas (atomic) and gas (atomic)-to-dust mass ratios of 15.1 and 58.2, respectively. Using our derived dust, atomic gas and stellar masses, we estimate cluster mass densities of 8.6(27.8) × 10 6, 4.6(13.9) × 10 8 and 7.8(29.7) × 10 9 M ⊙Mpc -3 for dust, atomic gas and stars, respectively. These values are higher than those derived for field galaxies by factors of 39(126), 6(18) and 34(129), respectively. In the above, the luminosity/mass densities are given using the whole sample with the values in brackets using just those galaxies that lie between 17 and 23 Mpc. We provide a data table of flux densities in all the Herschel bands for all 78 bright Virgo Cluster galaxies. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
    Original languageEnglish
    Pages (from-to)3505-3520
    JournalMonthly Notices of the Royal Astronomical Society
    Volume419
    Issue number4
    DOIs
    Publication statusPublished - 2012

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