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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.


Seminars are also held at JAC, CFHT, and IfA.



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