Second talk by Gregory C. Sloan – University of Copenhagen

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Second talk by Gregory C. Sloan

Gregory C. Sloan will give a talk Tuesday 6 September 2011 at 12:00 in the DARK lounge entitled: "The nature of interstellar organics".

The veritable stew of acronyms used to describe the many forms of
carbon-rich dust observed in the Universe can be a mouthful.
Infrared spectroscopy, which first revealed the UIR (unidentified
infrared) emission features, has, after decades, finally shown us
what produces them.  The short answer is PAHs (polycyclic aromatic
hydrocarbons), but the longer answer is that PAHs are only one form
of organic interstellar dust.  Clues from recent infrared spectral
data suggest (strongly) that interstellar carbon exists as a mixture
of aromatic and aliphatic hydrocarbons, an idea first proposed as
part of the hydrogenated amorphous carbon (HAC) model.  How these
forms of carbon-rich dust are related to amorphous carbon (AmC) is
an open question.