Abstract

We have observed Dwingeloo 1, which was discovered behind the disk of the Milky Way in 1994, in the CO (J = 1−0) line transition with the Nobeyama 45-m telescope. We detected very weak CO line emission in the optical bar and marginally at the center. The surface density of molecular gas derived using the Galactic conversion factor N(H2)/ICO = 2.6 × 1020 in only 8.4 M⊙ pc-2, correcting for the inclination of the galaxy even in the center. The central surface density of molecular gas and the M(H2)/M(H I) ratio indicate that Dwingeloo 1 is a molecular gas-poor galaxy.

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