Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..123...43s&link_type=abstract
A & A Supplement series, Vol. 123, May II 1997, 43-58.
Astronomy and Astrophysics
Astronomy
8
Ism: Cas, Clouds Atoms, Radio Lines: Ism
Scientific paper
We present high resolution images of the entire galactic HI spectrum of Cas A and display the whole data cube in various ways; the spatial resolution is 30 arcsec and the velocity resolution is 0.62 km s^{-1}. In previous studies, observations are described either with lower velocity resolution or with a limited velocity range (below -30 km s^{-1}), \cite[(Bieging et al. 1991]{Bieging91}; \cite[Reynoso et al. 1997)]{Reyno96}. Here we concentrate the discussion on the local HI gas, with velocities between -10 and +10 km s^{-1}. At a velocity of -1.5 km s^{-1} we find a cold HI feature with a kinetic temperature of typically 25 K, with a small region of 1 by 2 arcmin with a kinetic temperature below 10 K. This feature can be associated with a 13CO feature observed by \cite[Wilson et al. (1993)]{Wilson93}. Based on the new HI absorption results we derive the ratio NHI/N({H}_2) \approx 0.05.
Goss William Miller
Kalberla Peter M. W.
Schwarz Ulrich J.
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