Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57l..29t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.57, No.5, pp. L29-L32
Astronomy and Astrophysics
Astronomy
10
Galaxies: Individual (Arp 220), Galaxies: Ism, Galaxies: Starburst, Molecular Processes, Radio Lines: Galaxies
Scientific paper
We observed ammonia (J, K) = (1, 1), (2, 2), (3, 3), and (4, 4) transitions at a wavelength of 1.3cm toward a prototypical ultraluminous infrared galaxy, Arp 220, with the Nobeyama 45-m radio telescope. We detected extremely wide absorption lines at the (1, 1) and (3, 3) transitions. The maximum total velocity width was ˜ 1800 km s-1. Such wide molecular absorption lines were detected for the first time in galaxies. The absorption lines are formed by ammonia only in front of the central compact continuum emission (˜ 1''=370pc). The present results clearly indicate the existence of extremely high-velocity motion in the central compact region of Arp 220. A possible origin of such motion is rapidly rotating gas, suggesting the existence of an active galactic nucleus, or outflowing or inflowing gas.
Nakai Naomasa
Nakanishi Kouichiro
Takano Shuro
Takano Toshiaki
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