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

Hughes, D. H., Gear, Walter Kieran ORCID: https://orcid.org/0000-0001-6789-6196 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:	21 Oct 2022 09:21
URI:	https://orca.cardiff.ac.uk/id/eprint/36065

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