Dust Extinction and the Internal Structure of Globule 2 in the Coalsack
- Author(s)
- L. J. Crews, T. L. Huard, C. J. Lada, J. F. Alves, K. P. Pershell
- Abstract
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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Joint ALMA Observatory, Harvard-Smithsonian Center for Astrophysics, University of Tennessee at Martin
- Journal
- Bulletin of the American Astronomical Society
- Volume
- 35
- Pages
- 737
- ISSN
- 0002-7537
- Publication date
- 05-2003
- Austrian Fields of Science 2012
- 103004 Astrophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/dust-extinction-and-the-internal-structure-of-globule-2-in-the-coalsack(8d98c411-72db-4d1f-bf69-458249036a34).html