Statistics – Computation
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5019w&link_type=abstract
American Astronomical Society, AAS Meeting #211, #50.19; Bulletin of the American Astronomical Society, Vol. 39, p.814
Statistics
Computation
Scientific paper
We have modeled optical to far infrared images, photometry, and spectroscopy of the object known as Gomez's Hamburger. We reproduce the images and spectrum with an edge-on disk of mass 0.3Msun and radius 1200 AU, surrounding an A0 star at a distance of 350 pc. Our distance determination is a factor of three smaller than previous analyses which innaccurately interpreted the optical spectrum. To accurately model the infrared spectrum we have extended our Monte Carlo radiation transfer codes to include fluorescent emission from PAH molecules and very small grains. We do this using pre-computed emissivity files for a wide range of values of the mean intensity of the exciting radiation field. When Monte Carlo photons are absorbed by PAHs we re-emit them by sampling from the emissivity files, thus simulating the fluorescence process without lengthy computations. We find our approach gives a good representation of the observed PAH spectrum indicating the ubiquitous nature of PAHs in a range of environments.
Draine Bruce
Robitaille Thomas
Whitney Barbara
Wood Kenneth
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