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


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-07-14

AUTHORS

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

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 (E0). Aromatic bands are not observed in the near-IR (2–15 μm) when E0 is low, even when the medium characteristics are typical for the average interstellarmedium in our Galaxy; this indicates a preference for high E0 values. The influence of the characteristics of the medium on the intensity ratios for the dust emission in various photometric bands is considered. The I3.4/I11.3 intensity ratio is most sensitive to the degree of aromatization of small grains. The I3.3/I70+160 ratio is a sensitive indicator of the contribution of aromatic grains to the total mass of dust. More... »

PAGES

669-681

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063772916070052

DOI

http://dx.doi.org/10.1134/s1063772916070052

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040636739


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