Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-20
Astrophys.J. 642 (2006) L127-L132
Astronomy and Astrophysics
Astrophysics
6 pages; 4 figures; accepted to ApJL; emulateapj style; figures compressed to reduce size of submission
Scientific paper
10.1086/504590
We present new images (groundbased optical and mid-infrared (MIR) from the Spitzer Space Telescope) and spectra (from Spitzer) of the archetypal starburst galaxy M 82. 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.
Armus Lee
Bendo George J.
Buckalew Brent Alan
Calzetti Daniela
Cannon John M.
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