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Our goal is to see if there is molecular gas extending throughout the opticallow surface brightness disk of the galaxy Malin 2. We used the heterodynereceiver array (HERA) mounted on the IRAM 30m telecope to make deepobservations at the frequency of the CO(2--1) line at nine different positionsof Malin~2. With a total observing time of 11 hours at a velocity resolution of11 km/s we achieve a sensitivity level of ~1 mK. We detect CO(2-1) lineemission from Malin~2. The line is detected in four of the nine HERA beams; afifth beam shows a marginal detection. These results not only confirm thatthere is molecular gas in the disk of Malin 2, but they also show that it isspread throughout the inner 34~kpc radius as sampled by the observations of thegalaxy disk. The mean molecular gas surface density in the disk is$1.1\pm0.2~M_{\odot}~pc^{-2}$ and the molecular gas mass lies between thelimits $4.9\times10^{8}$ to $8.3\times10^{8}~M_{\odot}$. The observed velocitydispersion of the molecular gas is higher ($\sim 13$\,km\,s$^{-1}$) than instar forming galactic disks. This could explain the disk stability and its lowstar formation activity.

Detection of Extended Molecular Gas in the Disk of the LSB Galaxy Malin~2