Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8422f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #84.22; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
The observed spectra of astronomical objects often include numerous emission and absorption lines, produced as a result of the interaction of ionizing radiation with interstellar matter. These line spectra are an import diagnostic of conditions in these nebulae. The plasma simulation code Cloudy has long been used to model these environments under the assumption of ionization equilibrium. However, in many cases the continuum source may vary on time scales that are short compared with the times needed for atomic processes in the gas to reach a steady state. Examples range from the envelopes of planetary nebulae to the interstellar medium in the host galaxy of a gamma-ray burst. We have expanded the treatment of dynamical flows described by Henney, Arthur, Williams & Ferland (ApJ 621, 328) to include the effects of a time-variable continuum source. We present calculations of several representative geometries in which these effects are important.
Ferland Gary J.
Henney William J.
Williams Richard J.
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