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A Sensitive Spectral Survey of Interstellar Features in the Near-UV [3040-3700Å]

Published online by Cambridge University Press:  21 February 2014

N. H. Bhatt  and
J. Cami
N. H. Bhatt
Affiliation:
Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada email: [email protected]
J. Cami
Affiliation:
Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada email: [email protected] SETI Institute, 189 Bernardo Avenue, Suite 100, Mountain View, CA 94043, USA
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Abstract

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We present a comprehensive and sensitive unbiased survey of interstellar features in the near-UV range (3040-3700 Å). We combined a large number of VLT/UVES archival observations of a sample of highly reddened early type stars – typical diffuse interstellar band (DIB) targets. We stacked the individual observations to obtain a spectrum with a signal-to-noise ratio exceeding 1500. Careful inspection of this spectrum reveals tens of absorption features of interstellar nature, most of which can be identified with various atomic and molecular features. We furthermore detect four weak unidentified features, but we cannot establish their interstellar nature. Our sensitivity is limited by telluric and instrumental residuals; this precludes us from detecting broader features (e.g. DIBs). For each detected feature, we measured fundamental parameters (radial velocities, line widths, and equivalent widths). We also compare our co-added spectrum to cold gas-phase laboratory measurements of small, neutral polycyclic aromatic hydrocarbon (PAH) molecules.

Keywords

ISM: atomsISM: moleculesISM: lines and bands
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 58 - 63
Copyright
Copyright © International Astronomical Union 2014 

References

Burrows, J. P., Richter, A., Dehn, A., et al. 1999, J. Quant. Spectrosc. Radiat. Transfer 61, 509Google Scholar
Dekker, H., D'Odorico, S., Kaufer, A., Delabre, B., & Kotzlowski, H. 2000, In: Iye, M., Moorwood, A. F. (eds.), Optical and IR Telescope Instrumentation and Detectors, vol. 4008 of SPIE Conference Series, pp. 534–545Google Scholar
Gredel, R., Carpentier, Y., Rouillé, G., et al. 2011, A&A 530, A26Google Scholar
Herbig, G. H. 1995, ARA&A 33, 19Google Scholar
Herbst, E. & van Dishoeck, E. F. 2009, ARA&A 47, 427Google Scholar
Salama, F., Galazutdinov, G. A., Krełowski, J., et al. 2011, ApJ 728, 154Google Scholar
Savage, B. D. & Sembach, K. R. 1996, ARA&A 34, 279Google Scholar
Tielens, A. G. G. M. 2013, Reviews of Modern Physics 85, 1021Google Scholar