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Diffuse Interstellar Bands in Emission

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

T. B. Williams ,
P. Sarre ,
C. C. M. Marshall ,
K. Spekkens  and
R. Kuzio de Naray
T. B. Williams
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa email: williams@saao.ac.za Dept. of Physics & Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd., Piscataway NJ 08854USA
P. Sarre
Affiliation:
School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, UK email: peter.sarre@nottingham.ac.uk
C. C. M. Marshall
Affiliation:
School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, UK email: peter.sarre@nottingham.ac.uk
K. Spekkens
Affiliation:
Dept. of Physics, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston ON K7K 7B4, XNS Canada email: kristine.spekkens@rmc.ca
R. Kuzio de Naray
Affiliation:
Dept. of Physics and Astronomy, Georgia State University, 25 Park Place, Atlanta GA 30303 USA email: kuzio@astro.gsu.edu
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Abstract

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Recent Fabry-Pérot observations towards the galaxy NGC 1325 with the Southern African Large Telescope (SALT) led to the serendipitous discovery of an emission feature centered at 661.3 nm arising from material in the interstellar medium (ISM) of our Galaxy; this emission feature lies at the wavelength of one of the sharper and stronger diffuse bands normally seen in absorption. The flux of the feature is 4.2 ± 0.5 × 10−18 es−1 cm−2 arcsec−2. It appears that this is the first observation of emission from a diffuse band carrier in the ISM, excited in this case by the interstellar radiation field. We present the discovery spectra and describe follow-up measurements proposed for SALT.

Keywords

ISM: lines and bandsISM: molecules
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E82
Copyright
Copyright © International Astronomical Union 2016