A Caltech Library Service

Extended Mid-Infrared Aromatic Feature Emission in M82

Engelbracht, C. W. and Kundurthy, P. and Gordon, K. D. and Rieke, G. H. and Kennicutt, R. C. and Smith, J.-D. T. and Regan, M. W. and Makovoz, D. and Sosey, M. and Draine, B. T. and Helou, G. and Armus, L. and Calzetti, D. and Meyer, M. and Bendo, G. J. and Walter, F. and Hollenbach, D. and Cannon, J. M. and Murphy, E. J. and Dale, D. A. and Buckalew, B. A. and Sheth, K. (2006) Extended Mid-Infrared Aromatic Feature Emission in M82. Astrophysical Journal Letters, 642 (2). L127-L132. ISSN 2041-8205. doi:10.1086/504590.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present new images (ground-based optical and mid-infrared [MIR] from the Spitzer Space Telescope) and spectra (from Spitzer) of the archetypal starburst galaxy M82. The Spitzer data show that the MIR emission extends at least 6 kpc along the minor axis of the galaxy. We use the optical and infrared data to demonstrate that the extended emission is dominated by emission from dust. The colors of the MIR emission and the spectra indicate that there is a strong component of aromatic feature emission (the MIR features commonly attributed to polycyclic aromatic hydrocarbons). The dust continuum and aromatic feature emission are both strong in the well-known superwind region of this galaxy; clearly, the carrier of the aromatic features can survive in close proximity to the wind, far from the plane of the galaxy. We also see significant emission by dust well outside the superwind region, providing the clearest picture to date of the dust distribution in the halo of this galaxy.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rieke, G. H.0000-0003-2303-6519
Kennicutt, R. C.0000-0001-5448-1821
Smith, J.-D. T.0000-0003-1545-5078
Draine, B. T.0000-0002-0846-936X
Helou, G.0000-0003-3367-3415
Armus, L.0000-0003-3498-2973
Calzetti, D.0000-0002-5189-8004
Meyer, M.0000-0003-1227-3084
Walter, F.0000-0003-4793-7880
Murphy, E. J.0000-0001-7089-7325
Dale, D. A.0000-0002-5782-9093
Sheth, K.0000-0002-5496-4118
Additional Information:© 2006 American Astronomical Society. Received 2006 February 2; accepted 2006 March 27; published 2006 April 17. We thank the anonymous referee for a constructive report that improved this Letter. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Support for this work, part of the Spitzer Space Telescope Legacy Science Program, was provided by NASA through contracts 1224769 and 1255094 issued by JPL/Caltech.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:dust, extinction; galaxies: individual (M82); galaxies: ISM; galaxies: peculiar; galaxies: starburst
Issue or Number:2
Record Number:CaltechAUTHORS:20110217-092654489
Persistent URL:
Official Citation:C. W. Engelbracht et al 2006 ApJ 642 L127 doi: 10.1086/504590
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22346
Deposited On:17 Feb 2011 19:29
Last Modified:09 Nov 2021 16:04

Repository Staff Only: item control page