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Date and Time of the Query: 2019-08-25 T13:35:09 PDT
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For refcode 2015ApJ...799...92J:
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2015ApJ...799...92J Sub-millimeter Telescope CO (2-1) Observations of Nearby Star-forming Galaxies Jiang, Xue-Jian; Wang, Zhong; Gu, Qiusheng; Wang, Junzhi; Zhang, Zhi-Yu Abstract. We present CO J = 2-1 observations toward 32 nearby gas-rich star-forming galaxies selected from the ALFALFA and Wide-field Infrared Survey Explorer (WISE) catalogs, using the Sub-millimeter Telescope (SMT). Our sample is selected to be dominated by intermediate-M_*_ galaxies. The scaling relations between molecular gas, atomic gas, and galactic properties (stellar mass, NUV -- r, and WISE color W3 -- W2) are examined and discussed. Our results show the following. (1) In the galaxies with stellar mass M_*_ <=10^10^ M_sun_, the H I fraction (f_H I_ = M_H I_/M_*_) is significantly higher than that of more massive galaxies, while the H_2_ gas fraction (f_H_2 = M_H_2/M_*_) remains nearly unchanged. (2) Compared to f_H_2, f_H I_ correlates better with both M_*_ and NUV -- r. (3) A new parameter, WISE color W3 -- W2 (12-4.6 micron), is introduced, which is similar to NUV -- r in tracing star formation activity, and we find that W3 -- W2 has a tighter anti-correlation with log f_H_2 than the anti-correlation of (NUV -- r)-f_H I_, (NUV -- r)-f_H_2, and (W3 -- W2)-f_H I_. This indicates that W3 -- W2 can trace the H_2_ fraction in galaxies. For the gas ratio M_H_2/M_H I_, only in the intermediate-M_*_ galaxies it appears to depend on M_*_ and NUV -- r. We find a tight correlation between the molecular gas mass M_H_2 and 12 micron (W3) luminosities (L_12 micron_), and the slope is close to unity (1.03 +/- 0.06) for the SMT sample. This correlation may reflect that the cold gas and dust are well mixed on a global galactic scale. Using the all-sky 12 micron (W3) data available in WISE, this correlation can be used to estimate CO flux for molecular gas observations and can even predict H_2_ mass for star-forming galaxies. Key words: galaxies: evolution, galaxies: ISM, infrared: galaxies, ISM: molecules, radio lines: galaxies
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