Ragan, Sarah ![]() |
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Abstract
We have identified 41 infrared dark clouds from the 8 μm maps of the Midcourse Space Experiment (MSX), selected to be found within 1 deg2 areas centered on known ultracompact H II regions. We have mapped these infrared dark clouds in N2H+1-->0, CS 2-->1, and C18O 1-->0 emission using the Five College Radio Astronomy Observatory. The maps of the different species often show striking differences in morphologies, indicating differences in evolutionary state and/or the presence of undetected, deeply embedded protostars. We derive an average mass for these clouds using N2H+ column densities of ~2500 Msolar, a value comparable to that found in previous studies of high-mass star-forming cores using other mass tracers. The line widths of these clouds are typically ~2.0-2.9 km/s. Based on the fact that they are dark at 8 μm, compact, and massive, and have large velocity dispersions, we suggest that these clouds may be the precursor sites of intermediate- and high-mass star formation.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Physics and Astronomy |
Subjects: | Q Science > QB Astronomy |
Publisher: | American Astronomical Society |
ISSN: | 0067-0049 |
Date of First Compliant Deposit: | 27 November 2017 |
Date of Acceptance: | 6 June 2006 |
Last Modified: | 05 May 2023 22:39 |
URI: | https://orca.cardiff.ac.uk/id/eprint/106492 |
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