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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Dwek, Eli
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2021The infrared echo of SN2010jl and its implications for shock breakout characteristics
- 2016Dust destruction by the reverse shock in the Cassiopeia A supernova remnantcitations
- 2015The Evolution of Dust Mass in the Ejecta of SN1987Acitations
- 2013The Importance of Physical Models for Deriving Dust Masses and Grain Size Distributions in Supernova Ejecta. I. Radiatively Heated Dust in the Crab Nebulacitations
- 2012Properties and Spatial Distribution of Dust Emission in the Crab Nebulacitations
- 2010The Chemistry of Population III Supernova Ejecta. II. The Nucleation of Molecular Clusters as a Diagnostic for Dust in the Early Universecitations
- 2004The Detection of Cold Dust in Cassiopeia A: Evidence for the Formation of Metallic Needles in the Ejectacitations
- 2004Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraintscitations
- 2003Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
- 2002The Zodiacal Emission Spectrum as Determined by COBE and Its Implicationscitations
Places of action
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article
Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
Abstract
We present new interstellar dust models which have been derived by simultaneously fitting the far ultraviolet to near infrared extinction, the diffuse infrared emission and, unlike previous models, the elemental abundances constraints on the dust for different interstellar medium abundances. The fitting problem is a typical ill-posed inversion problem, in which the grain size distribution is the unknown, which we solve by using the method of regularization. We reproduce the Li & Draine (2001, ApJ, 554, 778) results, however their model requires an excessive amount of silicon to be locked up in dust: 48 ppm (atoms per million of H atoms), significantly more than the upper limit imposed by solar (34 ppm) or B star (19 ppm) abundance constraints.A major conclusion of this paper is that there exist several distinct interstellar dust models that simultaneously fits the observed extinction, infrared emission, and abundances constraints. We find four classes of acceptable interstellar dust models. The first class is identical in composition to the Li & Draine model, consisting of PAHs, bare graphite and silicate grains, but with different size distributions that are optimized to comply with the above constraints. The second class of models contains in addition to PAHs, bare graphite and silicate grains, composite particles consisting of different mixtures of silicate, amorphous carbon, organic refractory material, water ice, and voids. The dust models with the composites are also more consistent with the available infrared extinction data. The third and fourth classes of models comprise of the first and second classes, respectively, with the graphite grains completely replaced by amorphous carbon grains. We have found simple analytical approximations to all the size distributions of the dust components in the models. We used Monte Carlo simulations in conjunction with the regularization method to estimate the uncertainties in the size distributions.