Infrared studies of dust and gas towards the Galactic Centre - 3-5 micron spectroscopy

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Cosmic Dust, Galactic Nuclei, Infrared Sources (Astronomy), Interstellar Gas, Milky Way Galaxy, Infrared Spectra, Infrared Spectroscopy, Infrared Telescopes, Line Of Sight, Molecular Absorption

Scientific paper

New 3-micron spectroscopy of the Galactic Center IR sources IRS 12 and 19 and new 4.6-4.8 micron spectroscopy of IRS 3, 7, and 12 are presented. IRS 12 has a broad 3 micron absorption feature and a pronounced 3.4 micron absorption. In all respects, it is similar to the spectra of other Galactic Center sources. IRS 19 has an extremely strong 3 micron absorption, similar to the water-ice feature seen towards dark cloud sources but with an enhanced long-wavelength wing. In the 4.6-4.8 micron spectral region, IRS 3, 7, and 12 all show absorption features due to gas-phase CO molecules. In addition, IRS 12 has the 4.67 micron solid CO absorption.

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