Gas-Phase Polycyclic Aromatic Hydrocarbons in Absorption toward Protostellar Sources?

Details Gas-Phase Polycyclic Aromatic Hydrocarbons in Absorption toward Protostellar Sources? Gas-Phase Polycyclic Aromatic Hydrocarbons in Absorption toward Protostellar Sources?

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554..126b&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 1, pp. 126-131.

Astronomy and Astrophysics

Astronomy

19

Infrared: Ism: Lines And Bands, Ism: Molecules, Stars: Individual: Alphanumeric: Gl 989, Stars: Individual: Alphanumeric: Gl 2591, Stars: Individual: Name: Elias 29, Stars: Individual (S140)

Scientific paper

One of the major criticisms of identifying the infrared emission bands with polycyclic aromatic hydrocarbon (PAH) molecules has been the lack of a match between laboratory spectra of individual PAHs and the emission features. Part of the difficulty arises from the complexity of modeling the emission mechanism with an a priori unknown mixture of ionized and neutral PAHs. A direct comparison between laboratory spectra of PAHs and astronomical sources is possible for absorption spectra. However, because of poor atmospheric transmission, ground-based spectra of the PAH absorption band in the C-H stretch region are too noisy to make a detailed comparison with laboratory spectra. In this paper we show that ISO Short Wavelength Spectrometer spectra of a few protostars that show a 3.25 μm absorption band can be well matched by laboratory absorption spectra of a mixture of isolated PAHs. Based on observations with ISO, an ESA project with instruments funded by ESA member states (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom), with the participation of ISAS and NASA.

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