Computer Science
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc...62m&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Computer Science
Scientific paper
We observed the spiral galaxy M31 in the [C II] 158 μ m line emission. An extended component was detected over the central 1.5 kpc region with a line-to-continuum ratio of [C II]/[40-120 μ m] ~= 5 x 10- 3. This ratio is 2--3 times larger than that of the Galactic counterpart and is comparable to that in the general Galactic Plane. We expect that the difference between the two galactic centers are due to the difference in (1) opacity of the molecular clouds or (2) molecular gas density; (1) a less opaque molecular cloud in the M31 center is translucent for photons energetic enough to heat dust grains but not energetic enough to heat gas, or (2) the self-shielding of CO molecules decreases the C+ abundance in the high-density molecular gas in our Galactic Center.
Mochizuki Kenji
Nakagawa Takao
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