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: http://www.naic.edu/~gibson/cv/igps06.html
Дата изменения: Thu May 11 06:01:35 2006 Дата индексирования: Tue Oct 2 01:11:39 2012 Кодировка: Поисковые слова: comet |
H I Self-Absorption (HISA) arises from cold H I gas in front of warmer H I emission at the same velocity. HISA is thus a unique probe of the velocity and temperature structure of the Galactic ISM, from sub-parsec scales within clouds up to multi-kiloparsec scales across the disk. Our location inside the Milky Way gives us simultaneously a better view of its ISM than any other galaxy's and a worse view of its overall structure, especially spiral arms. HISA longitude-velocity distributions extracted from the IGPS might assist with this problem by tracing cold H I in spiral density waves. But how clear is this tracer likely to be, and how unique? To address this question, a series of simple H I radiative transfer models of the Galaxy will be presented.