Modeling the Unidentified Infrared Emission with Combinations of Polycyclic Aromatic Hydrocarbons

Details Modeling the Unidentified Infrared Emission with Combinations of Polycyclic Aromatic Hydrocarbons Modeling the Unidentified Infrared Emission with Combinations of Polycyclic Aromatic Hydrocarbons

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...511l.115a&link_type=abstract

The Astrophysical Journal, Volume 511, Issue 2, pp. L115-L119.

Astronomy and Astrophysics

Astronomy

183

Infrared: Ism: Lines And Bands, Ism: Individual: Name: Orion Bar, Ism: Individual: Alphanumeric: Iras 22272+5435, Line: Formation, Line: Identification, Line: Profiles, Molecular Data, Radiation Mechanisms: Nonthermal

Scientific paper

The infrared emission band spectrum associated with many different interstellar objects can be modeled successfully by using combined laboratory spectra of neutral and positively charged polycyclic aromatic hydrocarbons (PAHs). These model spectra, shown here for the first time, alleviate the principal spectroscopic criticisms previously leveled at the PAH hypothesis and demonstrate that mixtures of free molecular PAHs can indeed account for the overall appearance of the widespread interstellar infrared emission spectrum. Furthermore, these models give us insight into the structures, stabilities, abundances, and ionization balance of the interstellar PAH population. These, in turn, reflect conditions in the emission zones and shed light on the microscopic processes involved in the carbon nucleation, growth, and evolution in circumstellar shells and the interstellar medium.

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