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New Infrared Diffuse Interstellar Bands in the Galactic Center and Elsewhere

Published online by Cambridge University Press:  21 February 2014

T. R. Geballe
T. R. Geballe*
Affiliation:
Gemini Observstory, 670 N. A'ohoku Place, Hilo, HI 96720U.S.A. email: [email protected]
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Abstract

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This paper updates the recent discovery of over a dozen new diffuse interstellar bands (DIBs), first in H-band spectra of stars in the Galactic center (GC) and toward stars in the Cygnus OB2 Association. The H-band DIBs, which currently number 15, are the longest wavelength DIBs reported to date and are the first found on sightlines toward the Galactic center. K-band (2.0-2.5 μm) spectra of the GC stars do not reveal additional DIBs. Comparison of the velocity profile of the strongest of the new DIBs in the sightline toward GCS3-2 (in the GC) with that toward Cygnus OB2 No. 9 and also with the broad velocity profiles of H3+ lines toward GCS3-2 confirm that a significant fraction of the diffuse material producing the DIB absorptions on sightlines to the GC is located within the central few hundred parsecs of the Galaxy.

Keywords

astrochemistryISM: lines and bandsGalaxy: center
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 64 - 67
Copyright
Copyright © International Astronomical Union 2014 

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