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The Herschel Virgo cluster survey: V. Star-forming dwarf galaxies - dust in metal-poor environments

M. Grossi, L. K. Hunt, S. C. Madden, C. Vlahakis, D. J. Bomans, M. Baes, G. J. Bendo, S. Bianchi, A. Boselli, M. Clemens, E. Corbelli, L. Cortese, A. Dariush, J. Davies, I. De Looze, S. Di Serego Alighieri, D. Fadda, J. Fritz, D. A. Garcia-Appadoo, G. Gavazzi, C. Giovanardi, T. Hughes, A. Jones, D. Pierini, M. Pohlen, S. Sabatini, M. W. L. Smith, J. Verstappen, E. M. Xilouris, S. Zibetti

We present the dust properties of a small sample of Virgo cluster dwarf galaxies drawn from the science demonstration phase data set of the Herschel Virgo Cluster Survey. These galaxies have low metallicities(7.8 < 12 + log(O/H) < 8.3) and star-formation rates ?10-1 M&sun; yr-1. We measure the spectral energy distribution(SED) from 100 to 500 mum and derive dust temperatures and dust masses. The SEDs are fitted by a cool component of temperature T ? 20 K, implying dust masses around 105 M&sun; and dust-to-gas ratios D within the range 10-3-10-2. The completion of the full survey will yield a larger set of galaxies, which will provide more stringent constraints on the dust content of star-forming dwarf galaxies. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

galaxies: dwarf ľ galaxies: ISM ľ dust - extinction ľ infrared: ISM

Section: Letters

Astronomy and Astrophysics
Volume 518, Number of pages L52_1
2010 July

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Instituto de Astrof├şsica e Ci├¬ncias do Espa├žo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda├ž├úo para a Ci├¬ncia e a Tecnologia
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