Variations in the Extinction Law, Ice Abundance, and Dust Grains in Molecular Cloud Cores

Details Variations in the Extinction Law, Ice Abundance, and Dust Grains in Molecular Cloud Cores Variations in the Extinction Law, Ice Abundance, and Dust Grains in Molecular Cloud Cores

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910522h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #105.22; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

With deep ground-based near-infrared observations and mid-infrared observations from the Spitzer Space Telescope, we characterize the infrared extinction law in dense molecular cloud cores and show that it is different than that in the diffuse interstellar medium. Furthermore, in the densest regions of the cores, this law is significantly different than that in the less dense core regions. These differences may be attributed to evolution of both grain composition, such as with ice mantling, and grain sizes. To estimate the effect of an evolving composition, we analyze the shapes and varying depths of ice and silicate features in infrared spectra, obtained from ground-based and Spitzer IRS observations, of background stars probing a wide range of extinctions in cores. We present and compare models of the dust grain populations in three regions of the interstellar medium: the diffuse interstellar medium, moderately dense regions of molecular cloud cores, and the densest regions of cores. In constructing these models, we make use of near-infrared, mid-infrared, and submillimeter observations toward cores. Thus, these comprehensive, high resolution models sufficiently characterize dust opacities in star forming regions for the wide spectral range, 1 850 um.

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