Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9712d&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #97.12; Bulletin of the American Astronomical Society, Vol. 33, p.1451
Astronomy and Astrophysics
Astronomy
Scientific paper
The silicate/graphite-PAH emission model (Li & Draine 2001) is shown to be applicable to dust in the Small Magellanic Cloud (SMC). The mid-IR emission spectrum of the quiescent molecular cloud SMC B1#1 -- characterized by an unusually high 11.3μ m/7.7μ m band ratio (Reach et al. 2000) -- can be explained by PAHs which are mostly neutral, without invoking a higher degree of hydrogenation than for Galactic PAHs. It is also shown that the present dust model is able to reproduce the COBE/DIRBE and IRAS spectral energy distribution from near-IR to far-IR for the SMC B1#1 cloud, as well as for the SMC as a whole. The PAH abundance required in SMC B1#1 is an order of magnitude greater than for the SMC as a whole. The PAH column density required to account for the mid-IR emission spectrum is expected to contribute a 2175Å extinction excess of ~0.5 mag through SMC B1#1. This research was supported by NASA grant NAG5-7030 and NSF grants AST-9619429 and AST-9988126. References: Li, A., & Draine, B.T. 2001, ApJ, 554, 778. Reach, W.T., Boulanger, F., Contursi, A., & Lequeux, J. 2000, A&A, 361, 895.
Draine Bruce T.
Li Aigen
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