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Diffuse Interstellar Bands in M33

Published online by Cambridge University Press:  21 February 2014

K. T. Smith ,
M. A. Cordiner ,
C. J. Evans ,
N. L. J. Cox  and
P. J. Sarre
K. T. Smith
Affiliation:
School of Chemistry, The University of Nottingham, Nottingham, NG7 2RD, UK email: [email protected] Royal Astronomical Society, Burlington House, Piccadilly, London, W1J 0BQ, UK
M. A. Cordiner
Affiliation:
NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20770, USA
C. J. Evans
Affiliation:
UK Astronomy Technology Centre, Royal Observatory Edinburgh, Edinburgh, EH9 3HJ, UK
N. L. J. Cox
Affiliation:
Institute for Astronomy, KU Leuven, Celestijnenlaan 200D, bus 2401, Leuven, Belgium
P. J. Sarre
Affiliation:
School of Chemistry, The University of Nottingham, Nottingham, NG7 2RD, UK email: [email protected]
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Abstract

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We present the first sample of diffuse interstellar bands (DIBs) in the nearby galaxy M33. Studying DIBs in other galaxies allows the behaviour of the carriers to be examined under interstellar conditions which can be quite different from those of the Milky Way, and to determine which DIB properties can be used as reliable probes of extragalactic interstellar media. Multi-object spectroscopy of 43 stars in M33 has been performed using Keck/DEIMOS. The stellar spectral types were determined and combined with literature photometry to determine the M33 reddenings E(B-V)M33. Equivalent widths or upper limits have been measured for the λ5780 DIB towards each star. DIBs were detected towards 20 stars, demonstrating that their carriers are abundant in M33. The relationship with reddening is found to be at the upper end of the range observed in the Milky Way. The line of sight towards one star has an unusually strong ratio of DIB equivalent width to E(B-V)M33, and a total of seven DIBs were detected towards this star.

Keywords

ISM: lines and bandsgalaxies: individual (M33)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 74 - 78
Copyright
Copyright © International Astronomical Union 2014 

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