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The Herschel Virgo Cluster Survey: IV. Resolved dust analysis of spiral galaxies

M. W. L. Smith, C. Vlahakis, M. Baes, G. J. Bendo, S. Bianchi, D. J. Bomans, 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, M. Grossi, T. Hughes, L. K. Hunt, A. Jones, S. C. Madden, D. Pierini, M. Pohlen, S. Sabatini, J. Verstappen, E. M. Xilouris, S. Zibetti

Abstract
We present a resolved dust analysis of three of the largest angular size spiral galaxies, NGC 4501 and NGC 4567/8, in the Herschel Virgo Cluster Survey(HeViCS) science demonstration field. Herschel has unprecedented spatial resolution at far-infrared wavelengths and with the PACS and SPIRE instruments samples both sides of the peak in the far infrared spectral energy distribution(SED). We present maps of dust temperature, dust mass, and gas-to-dust ratio, produced by fitting modified black bodies to the SED for each pixel. We find that the distribution of dust temperature in both systems is in the range ~19-22 K and peaks away from the centres of the galaxies. The distribution of dust mass in both systems is symmetrical and exhibits a single peak coincident with the galaxy centres. This Letter provides a first insight into the future analysis possible with a large sample of resolved galaxies to be observed by Herschel. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

Keywords
galaxies: evolution - galaxies: spiral - galaxies: ISM

Astronomy and Astrophysics
Volume 518, Number of pages L51_1
2010 July

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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