Kana Matsui, Kazuo Sorai, Yoshimasa Watanabe, Nario Kuno
We present the results of CO (J=1-0) observations towards nine barred spiral
galaxies at z=0.08-0.25 using the 45-m telescope at Nobeyama Radio Observatory
(NRO). This survey is the first one specialized for barred spiral galaxies in
this redshift range. We detected CO emission from six out of nine galaxies,
whose CO luminosity (L_CO') ranges (1.09-10.8)\times10^9 K km s^{-1} pc^2.
These are the infrared (IR) dimmest galaxies that have ever been detected in CO
at z~0.1 to date. They follow the L_CO'-L_IR relation among local spiral
galaxies, Luminous Infrared Galaxies (LIRGs), Ultra-Luminous Infrared Galaxies
(ULIRGs) and Sub-millimeter Galaxies (SMGs). Their L_CO' and L_IR are higher
than that of local spiral galaxies which have been detected in CO so far, and
L_IR/L'_CO, which is a measure of star formation efficiency, is comparable to
or slightly higher than that of local ones. This result suggests that these
galaxies are forming stars more actively than local spirals galaxies simply
because they have more fuel.
View original:
http://arxiv.org/abs/1112.6091
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