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Fig. 2.


H I and CO spectra of our targets. The black thick lines show the H I spectra obtained from FAST. The H I spectrum are rebinned into 20 km s−1 resolution. The red dot lines are the CO(1−0) line from our previous ALMA survey. The scales of the CO emission lines are shown in the right y-axis. We adopt the optical spectroscopy redshift to derive the line velocity. We show the ALFALFA H I spectrum of the galaxy HATLASJ083601.5+002617 in blue in the upper left panel. Effective on-target integration time of Arecibo telescope is about 48 s. The edges of the emission lines are very sharp, and we obtain a line width consistent with the ALFALFA results. The grey regions highlight the velocity channels we used to derive the H I flux.

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