Dust model containing polycyclic aromatic hydrocarbons in various environments

Details Dust model containing polycyclic aromatic hydrocarbons in various environments Dust model containing polycyclic aromatic hydrocarbons in various environments

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..614s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 614-626.

Astronomy and Astrophysics

Astrophysics

123

Aerospace Environments, Aromatic Compounds, Cosmic Dust, Cyclic Hydrocarbons, Infrared Spectra, Interstellar Extinction, H Ii Regions, Planetary Nebulae, Reflection Nebulae, Solar Neighborhood

Scientific paper

We analyze the IR spectra and the extinction curve in four kinds of astronomical environments: the solar neighborhood, two reflection nebulae (N 2023 and N 7023), a planetary nebula (N 7027), and an H II region (M42 = Orion A). The observations, including the high-resolution data of the IR features from PAHs, are fit by a dust model that consists of three components: (1) big grains with radii greater than 100 A of silicate and carbon (they are responsible for the FIR emission and the linear rise in the extinction curve); (2) small graphite particles to explain the mid-IR emission and the 2175 A extinction bump; and (3) PAHs which produce the near- and mid-IR bands, part of the underlying continuum and the nonlinear rise in the FUV. We outline the method for calculating the radiation emitted by the particles including effects of quantum heating. The radiation field differs strongly in hardness and strength in the four types of selected sources and in Orion observations refer to different distances from the exciting star. Therefore, we can quantitatively assess the influence of the environment on the structure and abundance of the PAHs.

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