The Submillimetre Structure of the Starburst Nucleus in M82 - a Diffraction-Limited 450-MICRON Map

Details The Submillimetre Structure of the Starburst Nucleus in M82 - a Diffraction-Limited 450-MICRON Map The Submillimetre Structure of the Starburst Nucleus in M82 - a Diffraction-Limited 450-MICRON Map

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270..641h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 3/OCT1, P. 641, 1994

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Scientific paper

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.

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