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Issue A&A
Volume 395, Number 1, November III 2002
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021419



A&A 395, L5-L8 (2002)
DOI: 10.1051/0004-6361:20021419

Letter

The kinetic temperature of Barnard 68

S. Hotzel, J. Harju and M. Juvela

Observatory, PO Box 14, 00014 University of Helsinki, Finland

(Received 12 September 2002 / Accepted 26 September 2002)

Abstract
We have observed the nearby isolated globule Barnard 68 (B68) in the (J,K)=(1,1) and (2,2) inversion lines of ammonia. The gas kinetic temperature derived from these is $T=10\pm1.2~\ensuremath{{\rm K}} $. The observed line-widths are almost thermal: $\ensuremath{\Delta V} =0.181\pm0.003~\ensuremath{{\rm km\,s^{-1}}} $ ( $\ensuremath{\Delta V_{\rm therm}} = 0.164\pm0.010~\ensuremath{{\rm km\,s^{-1}}} $ ), supporting the earlier hypothesis that B68 is in hydrostatic equilibrium.

The kinetic temperature is an input parameter to the physical cloud model put forward recently, and we discuss the impact of the new value in this context.


Key words: ISM: individual objects: Barnard 68 -- ISM: abundances -- ISM: molecules

Offprint request: S. Hotzel, hotzel@astro.helsinki.fi

SIMBAD Objects



© ESO 2002

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