Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

The thermodynamics of dense cores

Whitworth, Anthony Peter, Boffin, H. M. J. and Francis, N. 1998. The thermodynamics of dense cores. Presented at: Star Formation with the Infrared Space Observatory, Lisbon, Portugal, 24-26 June, 1997. Published in: Yun, Joao and Liseau, Rene eds. Star Formation with the Infrared Space Observatory. Astronomical Society of the Pacific Conference Series, p. 183.

Full text not available from this repository.

Abstract

We consider the basic thermodynamics of dense interstellar gas, in the context of collapse and fragmentation, and show that there is a critical entity having mass ~M_\odot and radius ~0.04 pc. On larger length-scales the gas is heated mainly by dissipation of turbulence and/or by cosmic rays, and it cools mainly by emitting molecular line radiation. On smaller length-scales the gas is heated mainly by gravitational compression, and it cools mainly by coupling to the dust. These considerations provide plausible explanations for (i) the scaling laws between clump masses, radii and internal velocity dispersions; R ~M^{1/2}; and; Delta v ~M^{1/4}; (ii) the thermal line-widths seen in the smallest dense cores and the asymmetries seen in those which host YSOs; (iii) the switch at ~0.04 pc which Larson has identified in the clustering properties of young stars -- between hierarchical clustering on larger scales, and binary/multiple systems on smaller scales; (iv) the predominance of stars having masses in the range 0.2 to 0.5 M_\odot

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: STAR FORMATION, DENSE CORES, DUST, TURBULENCE
Publisher: Astronomical Society of the Pacific Conference Series
Last Modified: 04 Jun 2017 07:52
URI: http://orca.cf.ac.uk/id/eprint/69190

Citation Data

Cited 2 times in Google Scholar. View in Google Scholar

Actions (repository staff only)

Edit Item Edit Item