Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/24180
Title: | Modeling Dust in the Magellanic Clouds | Authors: | Zonca, Alberto CASU, Silvia MULAS, Giacomo ARESU, Giambattista CECCHI PESTELLINI, Cesare |
Issue Date: | 2015 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 810 | Issue: | 1 | First Page: | 70 | Abstract: | We model the extinction profiles observed in the Small and Large Magellanic clouds with a synthetic population of dust grains consisting of core-mantle particles and a collection of free-flying polycyclic aromatic hydrocarbons (PAHs). All different flavors of the extinction curves observed in the Magellanic Clouds (MCs) can be described by the present model, which has been previously (successfully) applied to a large sample of diffuse and translucent lines of sight in the Milky Way. We find that in the MCs the extinction produced by classical grains is generally larger than absorption by PAHs. Within this model, the nonlinear far-UV rise is accounted for by PAHs, whose presence in turn is always associated with a gap in the size distribution of classical particles. This hints either at a physical connection between (e.g., a common cause for) PAHs and the absence of middle-sized dust particles or the need for an additional component in the model that can account for the nonlinear far-UV rise without contributing to the UV bump at ∼217 nm such as, e.g., nanodiamonds. | URI: | http://hdl.handle.net/20.500.12386/24180 | URL: | https://iopscience.iop.org/article/10.1088/0004-637X/810/1/70 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/810/1/70 | Bibcode ADS: | 2015ApJ...810...70Z | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Zonca_2015_ApJ_810_70.pdf | PDF editoriale | 1 MB | Adobe PDF | View/Open |
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