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The evolution of hydrocarbon dust grains in the interstellar medium and its influence on the infrared spectra of dust

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Abstract

Computations of the evolution of the distributions of the size and degree of aromatization of interstellar dust grains, destruction by radiation and collisions with gas particles, and fragmentation during collisions with other grains are presented. The results of these computations are used to model dust emission spectra. The evolution of an ensemble of dust particles sensitively depends on the initial size distribution of the grains. Radiation in the considered range of fluxes mainly aromatizes grains. With the exception of the smallest grains, it is mainly erosion during collisions with gas particles that leads to the destruction of grains. In the presence of particle velocities above 50 km/s, characteristic for shocks in supernova remnants, grains greater than 20 Å in size are absent. The IR emission spectrum changes appreciably during the evolution of the dust, and depends on the adopted characteristics of the grains, in particular, the energy of their C–Cbonds (E 0). Aromatic bands are not observed in the near-IR (2–15 μm) when E 0 is low, even when the medium characteristics are typical for the average interstellarmedium in our Galaxy; this indicates a preference for high E 0 values. The influence of the characteristics of the medium on the intensity ratios for the dust emission in various photometric bands is considered. The I 3.4/I 11.3 intensity ratio is most sensitive to the degree of aromatization of small grains. The I 3.3/I 70+160 ratio is a sensitive indicator of the contribution of aromatic grains to the total mass of dust.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    M. S. Murga, S. A. Khoperskov & D. S. Wiebe

  2. GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190, Meudon, France

    S. A. Khoperskov

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  1. M. S. Murga
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  2. S. A. Khoperskov
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  3. D. S. Wiebe
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Correspondence to M. S. Murga.

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Original Russian Text © M.S. Murga, S.A. Khoperskov, D.S. Wiebe, 2016, published in Astronomicheskii Zhurnal, 2016, Vol. 93, No. 7, pp. 656–668.

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Murga, M.S., Khoperskov, S.A. & Wiebe, D.S. The evolution of hydrocarbon dust grains in the interstellar medium and its influence on the infrared spectra of dust. Astron. Rep. 60, 669–681 (2016). https://doi.org/10.1134/S1063772916070052

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  • DOI: https://doi.org/10.1134/S1063772916070052

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