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“School of Astronomy”

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Paper   IPM / Astronomy / 14342
School of Astronomy
  Title:   Probing the diffuse interstellar medium with diffuse interstellar bands
  Author(s): 
1.  J.Th. van Loon,
2.  M. Bailey
3.  A. Farhang
4.  A. Javadi
5.  H.G. Khosroshahi
  Status:   Published
  Journal: IAU
  Year:  2015
  Supported by:  IPM
  Abstract:
For a century already, a large number of absorption bands have been known at optical wavelengths, called the diffuse interstellar bands (DIBs). While their carriers remain unidentified, the relative strengths of these bands in various environments make them interesting new probes of the diffuse interstellar medium (ISM). We present the results from two large, dedicated campaigns to map the ISM using DIBs measured in the high signal-to-noise spectra of hundreds of early-type stars: [1] in and around the Local Bubble using ESO's New Technology Telescope and the Isaac Newton Telescope, and [2] across both Magellanic Clouds using the Very Large Telescope and the Anglo-Australian Telescope. We discuss the implications for the structure and dynamics of the ISM, as well as the constraints these maps place on the nature of the carriers of the DIBs. Partial results have appeared in the recent literature (van Loon et al. 2013; Farhang et al. 2015a,b; Bailey, PhD thesis 2014) with the remainder being prepared for publication now.

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