Infrared studies of dust and gas towards the Galactic Centre: 3–5 µm spectroscopy
Open Access
- 1 December 1989
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 241 (4) , 873-882
- https://doi.org/10.1093/mnras/241.4.873
Abstract
We present new 3 µm spectroscopy of the Galactic Centre infrared sources IRS 12 and 19 and new 4.6−4.8 µm spectroscopy of IRS 3, 7 and 12. IRS 12 has a broad 3 µm absorption feature, and a pronounced 3.4 µm absorption, as seen in other Galactic Centre sources and attributed to C−H bond stretching in organic molecules or hydrogenated amorphous carbon. In all respects it is similar to the spectra of other Galactic Centre sources. IRS 19 has an extremely strong 3 µm 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 µm 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 µm solid CO absorption.Keywords
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