The Interstellar 4.62 Micron Band

Details The Interstellar 4.62 Micron Band The Interstellar 4.62 Micron Band

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...513..294p&link_type=abstract

The Astrophysical Journal, Volume 513, Issue 1, pp. 294-304.

Astronomy and Astrophysics

Astronomy

73

Infrared: Ism: Lines And Bands, Ism: Clouds, Ism: Molecules, Line: Identification, Stars: Pre-Main-Sequence

Scientific paper

We present new 4.5-5.1 μm (2210-1970 cm^-1) spectra of embedded protostars, W33 A, AFGL 961 E, AFGL 2136, NGC 7538 IRS 9, and Mon R2 IRS 2, which contain a broad absorption feature located near 4.62 μm (2165 cm^-1), commonly referred to in the literature as the ``X-C=N'' band. The observed peak positions and widths of the interstellar band agree to within 2.5 cm^-1 and 5 cm^-1, respectively. The strengths of the interstellar 4.62 μm band and the ice absorption features in these spectra are not correlated, which suggests a diversity of environmental conditions for the ices we are observing. We explore several possible carriers of the interstellar band and review possible production pathways through far-ultraviolet photolysis (FUV), ion bombardment of interstellar ice analog mixtures, and acid-base reactions. Good fits to the interstellar spectra are obtained with an organic residue produced through ion bombardment of nitrogen-containing ices or with the OCN^- ion produced either through acid-base reactions or FUV photolysis of NH_3-containing ices.

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