Dense Clums in the L1630 Molecular Cluod - Physical Structure and Properties

Gibb, A.G. and Little, L.T and Heaton, B.D. and Lehtinen, K.K. (1995) Dense Clums in the L1630 Molecular Cluod - Physical Structure and Properties. Monthly Notices of the Royal Astronomical Society, 277 (1). pp. 341-352. ISSN 0035-8711. (The full text of this publication is not available from this repository)

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Abstract

This paper reports observations of six out of 42 interstellar molecular cloud cores identified by the CS survey of L1630 by Lada, Bally & Stark. High-resolution (14-20 arcsec) maps in J=3-->2, 4-->3 HCO+ and 5-->4 CS identify at least 22 emission maxima, 14 of which are associated with two of the former cores. Lower resolution (60 arcsec) maps of the J=1-->0 HCO+ emission show little or no evidence for the structure seen in the higher-J maps. Three of the six cores are significantly elongated - we conclude that they are probably filaments rather than fragmented discs or rings seen edge-on. Most of the maxima are unresolved in a 14-20 arcsec beam; therefore most of the virial mass estimates are upper limits. Those that are not suggest clump masses of a few M(.). Masses derived from dust continuum observations in one of the cores (number 23) are in good agreement with the virial masses. LVG analysis has been applied to a two-component model of the cores in which the 1-->0 HCO+ emission traces a low-density (10(4) cm(-3)) envelope while the 3-->2 and 4-->3 HCO+ lines trace the higher-density clumps (10(6) cm(-3)). These clumps are excellent candidates for low-mass protostellar activity.

Item Type: Article
Uncontrolled keywords: ISM, CLOUDS; ISM, INDIVIDUAL, LYNDS 1630; ISM, MOLECULES; ISM, STRUCTURE; RADIO LINES, ISM
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: P. Ogbuji
Date Deposited: 01 Jun 2009 11:01
Last Modified: 25 Jun 2012 09:00
Resource URI: http://kar.kent.ac.uk/id/eprint/19553 (The current URI for this page, for reference purposes)
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