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Low-Mass Star-Forming Cores in the GF9 Filament

Furuya, Ray S. and Kitamura, Yoshimi and Shinnaga, Hiroki (2008) Low-Mass Star-Forming Cores in the GF9 Filament. Publications of the Astronomical Society of Japan, 60 (3). pp. 421-428. ISSN 0004-6264.

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We carried out an unbiased mapping survey of dense molecular cloud cores traced by the NH3 (1,1) and (2,2) inversion lines in the GF 9 filament, which contains an extremely young low-mass protostar, GF 9-2 (2006, ApJ, 653, 1369). The survey was conducted using the Nobeyama 45m telescope over a region of ~1.5° × 1° with an angular resolution of 73". The large-scale map revealed that the filament contains at least 7 dense cores, as well as 3 possible ones, located at regular intervals of ~0.9 pc. Our analysis shows that these cores have kinetic temperatures of ≾10K and LTE-masses of 1.8–8.2M☉, which makes them typical sites of low-mass star formation. All of the identified cores are likely to be gravitationally unstable, because their LTE-masses are larger than their virial masses. Since the LTE-masses and separations of the cores are consistent with the Jeans masses and lengths, respectively, for the low-density ambient gas, we argue that the identified cores formed via the gravitational fragmentation of the natal filamentary cloud.

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Additional Information:Copyright (c) 2008, The Astronomical Society of Japan. (Received 2007 November 19; accepted 2008 April 4). Available Electronically, June 26, 2008. [arXiv (Submitted on 30 April 2008)] The authors sincerely thank Thomas A. Bell for a critical reading of the paper. R.S.F. thanks Isabel de Maurissens for providing a copy of the Viotti (1969) paper, which is published in Memorie della Societa Astronomia Italiana. It is a great pleasure to thank the staff of NRO for their generous help during the observations. This work is partially supported by a Grant-in-Aid for Scientific Research (A) from the Ministry of Education, Culture, Sports, Science and Technology (No. 19204020).
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Ministry of Education, Culture, Sports, Science and Technology19204020
Subject Keywords:ISM: clouds — ISM: evolution — ISM: individual (GF 9, L 1082) — ISM: molecules — stars: formation —stars: pre-main sequence
Issue or Number:3
Record Number:CaltechAUTHORS:FURpasj08
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ID Code:11735
Deposited By: Archive Administrator
Deposited On:22 Sep 2008 17:42
Last Modified:03 Oct 2019 00:21

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