Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
---|---|---|
Article Number | L66 | |
Number of page(s) | 5 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201014567 | |
Published online | 16 July 2010 |
Letter to the Editor
SPIRE imaging of M 82: Cool dust in the wind and tidal streams*
1
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis Boulevard Arago, 75014 Paris, France e-mail: roussel@iap.fr
2
Dept. of Physics & Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
3
School of Physics & Astronomy, Cardiff University, Queens Buildings The Parade, Cardiff CF24 3AA, UK
4
ESA Astrophysics Missions Division, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands
5
CEA, Laboratoire AIM, Irfu/SAp, Orme des Merisiers, 91191 Gif-sur-Yvette, France
6
Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, 9000 Gent, Belgium
7
Dept. of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK
8
Astrophysics Group, Imperial College, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
9
Jet Propulsion Laboratory, Pasadena, CA 91109, USA;
Dept. of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
10
Laboratoire d'Astrophysique de Marseille, UMR6110 CNRS, 38 rue F. Joliot-Curie, 13388 Marseille France
11
Instituto de Astrofísica de Canarias, vía Láctea S/N, 38200 La Laguna, Spain
12
Dept. of Physics & Astronomy, University of California, Irvine, CA 92697, USA
13
Observational Cosmology Lab, Code 665, NASA Goddard Space Flight Center Greenbelt, MD 20771, USA
14
Dept. of Astrophysical & Planetary Sciences, CASA CB-389, University of Colorado, Boulder, CO 80309, USA
15
Astronomy Centre, Dept. of Physics and Astronomy, University of Sussex, UK
16
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
17
School of Physics & Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
18
Istituto di Fisica dello Spazio Interplanetario, INAF, Via del Fosso del Cavaliere 100, 00133 Roma, Italy
19
Infrared Processing & Analysis Center, California Institute of Technology, Mail Code 100-22, 770 South Wilson Av, Pasadena, CA 91125, USA
20
Centre for Astrophysics Research, Science & Technology Research Centre, University of Hertfordshire, College Lane, Herts AL10 9AB, UK
21
University of Padova, Dept. of Astronomy, Vicolo Osservatorio 3, 35122 Padova, Italy
22
Observatoire Astronomique de Strasbourg, UMR 7550 Université de Strasbourg - CNRS, 11, rue de l'Université, 67000 Strasbourg, France
23
UK Astronomy Technology Center, Royal Observatory Edinburgh, Edinburgh, EH9 3HJ, UK
24
Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
Received:
30
March
2010
Accepted:
13
April
2010
M 82 is a unique representative of a whole class of galaxies, starbursts with superwinds, in the Very Nearby Galaxy Survey with Herschel. In addition, its interaction with the M 81 group has stripped a significant portion of its interstellar medium from its disk. SPIRE maps now afford better characterization of the far-infrared emission from cool dust outside the disk, and sketch a far more complete picture of its mass distribution and energetics than previously possible. They show emission coincident in projection with the starburst wind and in a large halo, much more extended than the PAH band emission seen with Spitzer. Some complex substructures coincide with the brightest PAH filaments, and others with tidal streams seen in atomic hydrogen. We subtract the far-infrared emission of the starburst and underlying disk from the maps, and derive spatially-resolved far-infrared colors for the wind and halo. We interpret the results in terms of dust mass, dust temperature, and global physical conditions. In particular, we examine variations in the dust physical properties as a function of distance from the center and the wind polar axis, and conclude that more than two thirds of the extraplanar dust has been removed by tidal interaction, and not entrained by the starburst wind.
Key words: dust, extinction / evolution / galaxies: interactions / galaxies: starburst / infrared: ISM
© ESO, 2010
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