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New Interstellar Dust Models Consistent with Interstellar Extinction, Emission and Abundances ConstraintsWe present new interstellar dust models that are consistent with both, the FUV to near-IR extinction and infrared (IR) emission measurements from the diffuse interstellar medium. The models are characterized by different dust compositions and abundances. The problem we solve consists of determining the size distribution of the various dust components of the model. This problem is a typical ill-posed inversion problem which we solve using the regularization approach. We reproduce the Li Draine (2001, ApJ, 554, 778) results, however their model requires an excessive amount of interstellar silicon (48 ppM of hydrogen compared to the 36 ppM available for an ISM of solar composition) to be locked up in dust. We found that dust models consisting of PAHs, amorphous silicate, graphite, and composite grains made up from silicates, organic refractory, and water ice, provide an improved fit to the extinction and IR emission measurements, while still requiring a subsolar amount of silicon to be in the dust. This research was supported by NASA Astrophysical Theory Program NRA 99-OSS-01.
Document ID
20020083030
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Zubko, V.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Dwek, E.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Arendt, R. G.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Oegerle, William
Date Acquired
August 20, 2013
Publication Date
December 1, 2001
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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