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DIBs Broadening with Increased Abundance of Vibrationally Excited H2 Molecules

Published online by Cambridge University Press:  21 February 2014

P. Gnaciński  and
J. Krełowski
P. Gnaciński
Affiliation:
University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland email: [email protected]
J. Krełowski
Affiliation:
Nicolaus Copernicus University, ul. Gagarina 11, 87-100 Toruń, Poland email: [email protected]
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Abstract

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The analysis of DIB profiles was used in various attempts to discover the DIBs carriers. The broadening of the 6196 Å DIB with increasing C2 rotational temperature was reported by Kaźmierczak et al. (2009). We present the broadening of the 4763, 5780 and 6614 Å DIBs connected with higher abundance of vibrationally excited hydrogen molecule. The DIBs broadening is also correlated with increasing H2 rotational temperature on the ν=2 vibrational level. The broadening may be caused by growing population of higher rotational levels in the DIB carrier. Some DIBs, like 4964 Å, do not show any width changes with higher population of vibrationally excited H2.

Keywords

ISM: moleculesISM: lines and bandsultraviolet: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 125 - 127
Copyright
Copyright © International Astronomical Union 2014 

References

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Kaźmierczak, M., et al. 2009, A&A, 498, 785Google Scholar
Meyer, D., et al. 2001, ApJ, 553, L59Google Scholar