Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9302c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #93.02; Bulletin of the American Astronomical Society, Vol. 39, p.889
Astronomy and Astrophysics
Astronomy
Scientific paper
We present spatial extinction maps of five well-characterized infrared dark clouds (IRDCs) at 8, 24 and 70 microns using data from the "MIPSGAL" and Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) surveys. The extinction curves agree well with theoretical extinction models for the dense interstellar medium (ISM). We investigate the spatial structure of the extinction and compare the estimated dust column densities to those derived from submillimeter continuum emission and to the gas column density as traced by optically thin millimeter spectral lines. The extinction profiles drop off sharply at the periphery of the IRDCs suggesting that the density profiles are also sharply truncated. Density profiles are constructed accounting for excitation of very small dust grains in the limbs of the IRDCs. This work is based [in part] on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
Carey Sean Joseph
Kraemer Karl
MIPSGAL Science Team
Mizuno Daisuke
Noriega-Crespo Alberto
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