Variations in the 3 Micron Spectrum across the Orion Bar: Polycyclic Aromatic Hydrocarbons and Related Molecules

Details Variations in the 3 Micron Spectrum across the Orion Bar: Polycyclic Aromatic Hydrocarbons and Related Molecules Variations in the 3 Micron Spectrum across the Orion Bar: Polycyclic Aromatic Hydrocarbons and Related Molecules

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474..735s&link_type=abstract

Astrophysical Journal v.474, p.735

Astronomy and Astrophysics

Astronomy

30

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Molecules, Ism: Individual Name: Orion Bar

Scientific paper

Long-slit spectra across the Orion Bar reveal significant differences in the spatial behavior of the components of the 3 mu m polycyclic aromatic hydrocarbon (PAH) spectrum. The strong PAH band at 3.29 mu m generally decreases exponentially with distance from the ionization front into the molecular cloud (scale height ~12"), although excesses appear ~10" and ~20" behind the ionization front, close to layers of H2 and CO emission, respectively. The 3.40 mu m PAH feature separates into two components with very different spatial distributions. The main component (at 3.395 mu m), along with the 3.51 mu m band and the PAH plateau (3.3--3.6 mu m), shows excess emission ~10" and ~20" behind the ionization front, stronger than the excesses in the 3.29 mu m band. The extra component of the 3.40 mu m band, which peaks at ~3.405 mu m, has a spatial distribution very similar to the H2 emission. Aromatic C---H stretches in PAHs most likely produce the 3.29 mu m feature. Aliphatic C---H stretches in either attached methyl sidegroups or superhydrogenated PAHs, or perhaps both, could produce the complicated spectral and spatial structure at 3.40 mu m.

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