High-resolution millimetre and submillimetre continuum observations of M17SW. - II Identification of embedded sources associated with H2O masers

Details High-resolution millimetre and submillimetre continuum observations of M17SW. - II Identification of embedded sources associated with H2O masers High-resolution millimetre and submillimetre continuum observations of M17SW. - II Identification of embedded sources associated with H2O masers

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264.1025h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 264, p. 1025

Astronomy and Astrophysics

Astronomy

20

Millimeter Waves, Submillimeter Waves, Water Masers, Molecular Clouds, Radio Astronomy, Star Formation, Infrared Astronomy, Interstellar Matter, Astronomical Maps, Spectral Energy Distribution, Temperature Distribution

Scientific paper

The M17SW molecular cloud core has been mapped in continuum emission at 450, 600, 800, 1100 and 1300 microns, using the James Clerk Maxwell Telescope, with an angular resolution of 8 arcsec for the shortest wavelength. The 450- and 600-micron maps, in particular, show the dust emission to be highly clumped; these clumps are, in some cases, identified with those seen in previous optically thin line observations. The continuum observations are consistent with a single greybody at a temperature of 30 K, and suggest masses of 7600 and 1300 solar masses for the entire M17SW region and the northern condensation, respectively; the corresponding total integrated luminosities for each region are 2.4 x 10 to the 5 and 4.2 x 10 to the 4 solar luminosities. Using an analytical inversion technique, however, which allows for a continuous range of dust temperatures, we find a mass-weighted average temperature of approximately 18 K, and masses for M17SW and the northern condensation alone of 1.6 x 10 to the 4 and 2000 solar masses, respectively. The flux from the northern condensation is dominated by three main components, each of which lies within a few arcsec of an H2O maser.

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