| Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
|---|---|---|
| Article Number | L52 | |
| Number of page(s) | 5 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361/201014653 | |
| Published online | 16 July 2010 | |
Letter to the Editor
The Herschel Virgo Cluster Survey*
V. Star-forming dwarf galaxies – dust in metal-poor environments
1
CAAUL, Observatório Astronómico de Lisboa, Universidade de Lisboa, Tapada da Ajuda, 1349-018, Lisboa, Portugal e-mail: grossi@oal.ul.pt
2
INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy
3
Laboratoire AIM, CEA/DSM - CNRS - Université Paris Diderot, Irfu/Service d'Astrophysique, 91191 Gif sur Yvette, France
4
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
5
Astronomical Institute, Ruhr-University Bochum, Universitaetsstr. 150, 44780 Bochum, Germany
6
Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, 9000 Gent, Belgium
7
Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
8
Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, 38 rue F. Joliot-Curie, 13388 Marseille, France
9
INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
10
Department of Physics and Astronomy, Cardiff University, The Parade, Cardiff, CF24 3AA, UK
11
NASA Herschel Science Center, California Institute of Technology, MS 100-22, Pasadena, CA 91125, USA
12
ESO, Alonso de Cordova 3107, Vitacura, Santiago, Chile
13
Universita' di Milano-Bicocca, piazza della Scienza 3, 20100, Milano, Italy
14
Institut d'Astrophysique Spatiale (IAS), Batiment 121, Universite Paris-Sud 11 and CNRS, 91405 Orsay, France
15
Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, 85741, Garching, Germany
16
INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, via Fosso del Cavaliere 100, 00133, Roma, Italy
17
Institute of Astronomy and Astrophysics, National Observatory of Athens, I. Metaxa and Vas. Pavlou, P. Penteli, 15236 Athens, Greece
18
Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg, Germany
Received:
31
March
2010
Accepted:
2
May
2010
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 
yr-1.
We measure the spectral energy distribution (SED) from 100 to 500 μm
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 and dust-to-gas ratios
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.
Key words: galaxies: dwarf / galaxies: ISM / dust, extinction / infrared: ISM
© ESO, 2010
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