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The submillimetre structure of the starburst nucleus in M82 - a diffraction-limited 450-MICRON Map

Hughes, D. H., Gear, Walter Kieran and Robson, E. I. 1994. The submillimetre structure of the starburst nucleus in M82 - a diffraction-limited 450-MICRON Map. Monthly Notices of the Royal Astronomical Society 270 (3) , pp. 641-649.

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Abstract

A diffraction-limited continuum map at 450 microns of the central 90 X 90 arcsec^2^ (~1.5-kpc diameter) region of the nearby starburst galaxy M82 is presented. These data from the 15-m JCMT represent the highest resolution study (~9-arcsec HPBW) yet carried out at submillimetre wavelengths of the thermal reradiated emission from dust in M82. The first continuum observations at 2 mm made at the NRAO 12-m are also presented. The 450-micron data show a double-peaked structure, similar to that observed in various molecular line transitions and 10-30 micron continuum maps. The variation in source size with wavelength and a major- axis intensity profile are consistent with emission from a cooler and larger scale component of the mid-IR dust torus. A spur of thermal emission, similar to that observed in Hα and X-ray emission, is detected extending southwards from the south-western peak. An integrated 450-micron flux: density of 41+/-6.0 Jy is measured. When corrected for free-free emission, the FIR-millimetre continuum is well fitted by optically thin emission from an isothermal population (T=48 K) of dust grains with an emissivity index: β = 1.3.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Last Modified: 04 Jun 2017 04:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/36065

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