Ultraviolet photoproduction of ISM dust. Laboratory characterisation and astrophysical relevance

Details Ultraviolet photoproduction of ISM dust. Laboratory characterisation and astrophysical relevance Ultraviolet photoproduction of ISM dust. Laboratory characterisation and astrophysical relevance

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..895d&link_type=abstract

Astronomy and Astrophysics, Volume 432, Issue 3, March IV 2005, pp.895-908

Astronomy and Astrophysics

Astrophysics

31

Ism: Dust, Extinction, Galaxies: Ism, Ism: Lines And Bands

Scientific paper

The production of a hydrogenated amorphous carbon polymer (a-C:H) via the photolysis of a series of organic molecule precursors at low temperature is described. Such amorphous material is synthesised under interstellar conditions (10 K and Lyman-α photons) and represents the best candidate to explain the Diffuse Interstellar Medium absorption observed in our Galaxy and in other galaxies. We perform a series of laboratory analyses (Infrared spectroscopy, μspectroscopy, Raman, Photoluminescence and UV-visible spectroscopy) which allow a full characterisation of such polymers. This allows us to assess the importance of the polymer and possible scenarios for its role in crucial aspects of the lifecycle of dust. Such material has implications for the carbon budget at galactic scales, hydrogen formation, extended red emission, as a PAH precursor, and in explaining the 2175 Å extinction bump.

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