Modeling anomalous extinction using nanodiamonds
arXiv:1204.3140 · doi:10.1111/j.1365-2966.2012.21109.x
Abstract
Modeling extinction along anomalous/non-CCM sightlines, which are characterized by a broad bump and steep far-ultraviolet (FUV) rise, is reported. The extinction along these sightlines, viz. {HD 210121}, {HD 204827}, {HD 29647} and {HD 62542}, is difficult to reproduce using standard silicate and graphite grains. Very good match with the observed extinction is obtained by considering nanodiamond component as part of carbonaceous matter. Most of these sightlines are rich in carbon and are invariably backed by a young hot stellar object. Nanodiamond is taken as core within amorphous carbon and graphite. These core-mantle particles taken as additional components along with graphite and silicates lead to reduction in the silicate requirement. The abundance of carbonaceous matter is not affected as a very small fraction of nanodiamond is required. Extinction along sightlines that show steep FUV is also reported demonstrating the importance of nanodiamond component in all such regions.
16 pages, 2 Tables and 3 Figures
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Cited by in corpus (5)
- Interstellar extinction and interstellar polarization: old and new models
- HD 62542: Probing the Bare, Dense Core of a Translucent Interstellar Cloud
- Tetrahedral hydrocarbon nanoparticles in space: X-ray spectra
- Dust growth in molecular cloud envelopes: a numerical approach
- Modelling dust extinction in the Magellanic Clouds