Far-infrared and CO observations of NGC 6357 and regions surrounding NGC 6357 and NGC 6334

Astronomy and Astrophysics – Astronomy

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Carbon Monoxide, Infrared Stars, Interstellar Masers, Molecular Clouds, Astronomical Maps, Brightness Temperature, Continuous Spectra, Far Infrared Radiation, Gas Density, H Ii Regions, Hydroxyl Emission, Infrared Astronomy, Infrared Spectra, Luminosity, Radio Sources (Astronomy)

Scientific paper

Two 1.7 square degree sections of the galactic plane at 70 microns have been surveyed with one-arcminute resolution. The scanned areas included the giant southern H II region complexes NGC 6357 and NGC 6334. Nineteen far-infrared sources were observed. The sources range in luminosity from 16,000 to 550,000 solar masses. Far-infared continuum and CO line observations of NGC 6357 are presented. Four far-infrared sources were found in this complex and for one of these sources the exciting stars are identified. Far-infrared and CO observations of sources in the field surrounding NGC 6357 and NGC 6334 are presented. The far-infrared sources coincide frequently with CO line temperature peaks. The CO clouds which surround the far-infrared sources have similar CO-13 column densities. Two of the far-infrared sources in the field have associated OH and H2O maser emission and compact H II regions.

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