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Title:
BLAST Observations of the Low-Mass Star Forming Region IC 5146
Authors:
France, K.
Publication:
The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the conference held December 2-5, 2007 at the Hilton Hotel, Pasadena, CA, Eds.: K. Sheth, A. Noriega-Crespo, J. Ingalls, and R. Paladini, Published online at http://ssc.spitzer.caltech.edu/mtgs/ismevol/
Publication Date:
01/2009
Origin:
AUTHOR
Keywords:
infrared: ISM , ISM: dust, extinction , ISM: structure
Bibliographic Code:
2009eimw.confE..25F

Abstract

IC 5146 is a star forming region in Cygnus, consisting of a young massive star cluster and lower mass regions that are just beginning to form stars. We present sub-mm observations of the low-mass northern streamer region of IC 5146. The dense cores in this region are thought to be pre-stellar and have been studied previously by SCUBA and molecular line observations. The new sub-mm observations were carried out during the 2005 flight of the Balloon-borne Large-Aperture Sub-millimeter Telescope (BLAST). The data are broadband images centered on 250, 350, and 500 μm. We combine the BLAST images with archival IRAS and Spitzer-MIPS observations to determine the spectral energy distributions (SEDs) of several point-like and diffuse sources in IC 5146. The SEDs reveal dust temperatures of roughly ˜14 K for both diffuse filaments and regions containing IRAS point sources and/or known protostars. We also present evidence for variations in the spatial distribution of grain temperatures in the region. These observations will allow us to constrain simple models of pre-stellar clouds and will support the upcoming Herschel, SPIRE Gould Belt Survey.
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