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Optical properties of interstellar graphite and silicate grains
Abstract
The dielectric functions for graphite and astronomical silicate material are computed using available laboratory and astronomical data. It is noted that the magnetic dipole contribution to absorption in the infrared wavelengths can be important for conducting particles such as graphite. Formulas are given for evaluating electric and magnetic dipole cross-sections for small particles. Absorption cross-sections are evaluated for graphite and silicate particles with sizes between 0.003 and 1.0 microns, and wavelengths from 300 A to 1000 microns. On the basis of polarization profiles computed for both prolate and oblate graphite-silicate spheroids, it is concluded that interstellar silicate grain are predominantly oblate. Extinction curves are calculated for Mathis-Rumpl-Nordsieck graphite-silicate grain mixtures and are compared to observations. The model is found to be in good agreement with available infrared observations.
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Citations
Cited by
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. (1998) · The Astrophysical Journal · doi:10.1086/305772 · Cited by 15,126
Light Absorption by Carbonaceous Particles: An Investigative Review
Bond, T. C., & Bergstrom, R. W. (2006) · Aerosol Science and Technology · doi:10.1080/02786820500421521 · Cited by 2,980
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
Self-citationDraine, B. T., & Li, A. (2007) · The Astrophysical Journal · doi:10.1086/511055 · Cited by 2,122
Self-citationThe interstellar environment of our galaxy
Ferrière, K. M. (2001) · Reviews of Modern Physics · doi:10.1103/revmodphys.73.1031 · Cited by 1,019
Metadata
- Authors
- Draine, B. T., & Lee, H. M.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1984-10
- Volume
- 285
- Pages
- 89
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2006869439
- Cited by
- 3,279
- References
- 0
- FWCI
- 31.28
- Type
- journal article
- Language
- en
- Open access
- closed
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- Draine, B. T., & Lee, H. M. (1984). Optical properties of interstellar graphite and silicate grains. The Astrophysical Journal. https://doi.org/10.1086/162480
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