SPIRE imaging of M82: cool dust in the wind and tidal streams
Abstract
M82 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 M81 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.
Keywords
Cite
@article{arxiv.1005.1526,
title = {SPIRE imaging of M82: cool dust in the wind and tidal streams},
author = {H. Roussel and C. D. Wilson and L. Vigroux and K. G. Isaak and M. Sauvage and S. C. Madden and R. Auld and M. Baes and M. J. Barlow and G. J. Bendo and J. J. Bock and A. Boselli and M. Bradford and V. Buat and N. Castro-Rodriguez and P. Chanial and S. Charlot and L. Ciesla and D. L. Clements and A. Cooray and D. Cormier and L. Cortese and J. I. Davies and E. Dwek and S. A. Eales and D. Elbaz and M. Galametz and F. Galliano and W. K. Gear and J. Glenn and H. L. Gomez and M. Griffin and S. Hony and L. R. Levenson and N. Lu and B. O'Halloran and K. Okumura and S. Oliver and M. J. Page and P. Panuzzo and A. Papageorgiou and T. J. Parkin and I. Perez-Fournon and M. Pohlen and N. Rangwala and E. E. Rigby and A. Rykala and N. Sacchi and B. Schulz and M. R. P. Schirm and M. W. L. Smith and L. Spinoglio and J. A. Stevens and S. Srinivasan and M. Symeonidis and M. Trichas and M. Vaccari and H. Wozniak and G. S. Wright and W. W. Zeilinger},
journal= {arXiv preprint arXiv:1005.1526},
year = {2015}
}
Comments
accepted in A&A Herschel special issue