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Nario Kuno, Baltasar Vila-Vilaró, Kohta Nishiyama, CO Observations of a Galaxy behind the Galactic Plane, Dwingeloo 1, Publications of the Astronomical Society of Japan, Volume 48, Issue 1, 1 February 1996, Pages 19–22, https://doi.org/10.1093/pasj/48.1.19
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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.