Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC

Details Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.4207w&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #42.07; Bulletin of the American Astronomical Society, Vol. 32, p.1466

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We construct size distributions for carbonaceous and silicate grain populations in different regions of the Milky Way, LMC, and SMC. The size distributions include sufficient very small carbonaceous grains (including polycyclic aromatic hydrocarbon molecules) to account for the observed infrared and microwave emission from the diffuse interstellar medium. Our distributions reproduce the observed extinction of starlight, which varies depending upon the interstellar environment through which the light travels. As shown by Cardelli, Clayton & Mathis in 1989, these variations can be roughly parameterized by the ratio of visual extinction to reddening, RV. We adopt a fairly simple functional form for the size distribution, characterized by several parameters. We tabulate these parameters for various combinations of values for RV and b C, the C abundance in very small grains. We also find size distributions for the line of sight to HD 210121, and for sightlines in the LMC and SMC. For several size distributions, we evaluate the albedo and scattering asymmetry parameter, and present model extinction curves extending beyond the Lyman limit. This work was supported in part by the National Science Foundation.

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