Abstract
Abstract We present IRAM 30 m observations of molecular lines of CO and its isotopologues from the massive spiral galaxy NGC 5908 selected from the CGM-MASS sample. 12CO J = 1 − 0, 12CO J = 2 − 1, and 13CO J = 1 − 0 lines have been detected in most of the positions along the galactic disk. The total molecular gas mass of NGC 5908 is and the total cool gas mass adding atomic hydrogen is , comparable to the upper limit of the mass of the X-ray emitting hot gas in the halo. Modeling the rotation curves constructed with all three CO lines indicates that NGC 5908 has a dark matter halo mass of , putting it among the most massive isolated spiral galaxies. The 12CO/13CO J = 1 − 0, 12CO J = 2 − 1/J = 1 − 0 line ratios and the estimated molecular gas temperature all indicate normal but non-negligible star formation in this fairly gas-rich massive isolated spiral galaxy, consistent with the measured star formation intensity and surface densities. The galaxy is probably at an early evolutionary stage after a fast growth stage with mergers and/or starbursts, with plenty of leftover cool gas, relatively high SFR, low hot CGM cooling rate, and low X-ray emissivity.
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