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Ammonia observations of bright-rimmed clouds: Establishing a sample of triggered protostars

Morgan, L.K., Figura, C.C., Urquhart, J.S., Thompson, M.A. (2010) Ammonia observations of bright-rimmed clouds: Establishing a sample of triggered protostars. Monthly Notices of the Royal Astronomical Society, 408 (1). pp. 157-169. ISSN 0035-8711. (doi:10.1111/j.1365-2966.2010.17134.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://www.dx.doi.org/10.1111/j.1365-2966.2010.171...

Abstract

We observed 42 molecular condensations within previously identified bright-rimmed clouds in the ammonia rotational inversion lines NH3(1,1), (2,2), (3,3) and (4,4) using the Green Bank Telescope in Green Bank, West Virginia. Using the relative peaks of the ammonia lines and their hyperfine satellites we have determined important parameters of these clouds, including rotational temperatures and column densities.These observations confirm the presence of dense gas towards IRAS point sources detected at submillimetre wavelengths. Derived physical properties allow us to refine the sample of bright-rimmed clouds into those likely to be sites of star formation, triggered via the process of radiatively driven implosion. An investigation of the physical properties of our sources shows that triggered sources are host to greater turbulent velocity dispersions, likely indicative of shock motions within the cloud material. These may be attributed to the passage of triggered shocks or simply the association of outflow activity with the sources.In all, we have refined the Sugitani, Fukui and Ogura catalogue to 15 clouds which are clearly star-forming and influenced by external photoionization-induced shocks. These sources may be said, with high confidence, to represent the best examples of triggering within bright-rimmed clouds.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2010.17134.x
Uncontrolled keywords: ISM: clouds, Photodissociation region (PDR), Stars: early-type, Stars: formation, Stars: pre-main-sequence
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 30 Nov 2015 16:10 UTC
Last Modified: 29 May 2019 16:28 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52231 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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