Pardon our Dust: Infrared Spectroscopy and Insterstellar Dust - Jean Chi...
Μετάδοση με ζωντανή ροή στις 11 Μαρ 2014
Interstellar dust grains - small
sub-micron-sized particles that pollute the space between the stars -
play an important role in the chemistry of the galaxy as well as the
star and planet formation process. We glean most information about dust
composition in the interstellar medium from infrared spectroscopy. The
vibration of molecules making up the dust cause light from a background
star to be absorbed at very specific frequencies in the infrared
portion of the spectrum. Dust originates in the outflows of old stars
and is composed mainly of silicate minerals and carbon particles. In
star formation regions, the silicate grains are covered with icy
mantles. I will give an overview of the nature of these dust and ice
components, with emphasis on our current understanding of the cosmic
life cycle of these materials.
sub-micron-sized particles that pollute the space between the stars -
play an important role in the chemistry of the galaxy as well as the
star and planet formation process. We glean most information about dust
composition in the interstellar medium from infrared spectroscopy. The
vibration of molecules making up the dust cause light from a background
star to be absorbed at very specific frequencies in the infrared
portion of the spectrum. Dust originates in the outflows of old stars
and is composed mainly of silicate minerals and carbon particles. In
star formation regions, the silicate grains are covered with icy
mantles. I will give an overview of the nature of these dust and ice
components, with emphasis on our current understanding of the cosmic
life cycle of these materials.
ΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 12/3/2014
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