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The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru
seminar organizers (Tomonori Usuda, Kumiko S. Usuda, Masahiko Hayashi, Masayuki Akiyama)
by email.
December 21, Wednesday at 12:30pm
" Observations of ammonia in galaxies;
Shuro Takano (Nobeyama Radio Observatory)
We observed ammonia at a wavelength of 1.3 cm
(23-24 GHz) in nearby galaxies with radiotelescopes
(mainly with the Nobeyama 45m). Ammonia is a good probe
of temperature and also molecular abundances in galaxies.
Based on our ammonia observations and other works already
published, the molecular abundance in a famous starburst galaxy
M 82 was found to be peculiar among nearby galaxies
regarding the formation mechanisms of molecules:
a reason for this is discussed.
Then, we present our recent results of ammonia observations
toward a prototypical ultraluminous infrared galaxy, Arp 220,
where quite wide absorption lines (total velocity width
of about 1800 km/s) were detected
(PASJ, 57, L29 (2005)). The present results clearly indicate
the existence of extremely high-velocity motion in the central
compact region of Arp 220.