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[29.04] Dust Extinction and the Internal Structure of Globule 2 in the Coalsack

L.J. Crews (U Tenn Martin), T.L. Huard, C.J. Lada (CfA), J.F. Alves (ESO), K.P. Pershell (U Tenn Martin)

We present a very high resolution map of the dust extinction for Globule 2 in the Coalsack. This map was constructed using near-infrared color excesses of more than 10000 background stars obtained from deep, New Technology Telescope observations. Like the well studied globule B\,68, this Coalsack globule appears to be azimuthally symmetric; but, unlike B\,68, it is not an isolated core. Instead, it is embedded within a less dense and more extended cloud. We model the radial density distribution of this Coalsack globule in order to determine its internal structure and stability. Furthermore, by analyzing the dispersion in the extinction, we investigate the nature of any small scale structure in the globule. We find the globule to be relatively smooth, determining that random spatial fluctuations in column density amount to no more than 10% on scales of 1000 AU or less.

The author(s) of this abstract have provided an email address for comments about the abstract: lcrews@utm.edu

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.