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CO emissions from optically selected galaxies at <i>z</i> ∼ 0.1–0.2: Tight anti-correlation between molecular gas fraction and 4000 Å break strength
We performed 12CO(J=1-0) (hereafter, CO) observations towards 12 normal star-forming galaxies with stellar mass of Mstar=10^10.6-10^11.3 Msun at z=0.1-0.2 with the 45-m telescope at the Nobeyama Radio Observatory (NRO). The samples are selected with Dn(4000) that is a strength of the 4000 \AA break, instead of commonly used far-infrared (FIR) …