Modeling The Diffuse Hα Background Radiation

Details Modeling The Diffuse Hα Background Radiation Modeling The Diffuse Hα Background Radiation

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6507w&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #65.07; Bulletin of the American Astronomical Society, Vol. 30, p.1341

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Monte Carlo simulations of the Diffuse Hα Galactic Background. Our models comprise direct and multiply scattered Hα radiation from the Kpc scaleheight Warm Ionized Medium and midplane H II regions. The scattering is off dust that is assumed to be well mixed with the gas, with scaleheights and scalelengths taken from the literature. We investigate smooth and clumpy models. The results of our simulations are all-sky Hα images that enable us to separate out the contributions of direct and scattered radiation. We also determine how far the model Hα photons have travelled, i.e., how far we see into the Galaxy at Hα . Our models reproduce the overall characteristics of the observed Hα background, with the clumpy models showing many filamentary structures. Our models predict the scattered Hα intensity at high latitudes is in the range 5% to 20% of the direct emission, in agreement with observations based on [S II]/Hα line ratio measurements.

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