SIMBAD references

We report the detection of CO emission from Dwingeloo 1, a nearby barred spiral galaxy discovered recently by Kraan-Korteweg et al. (1994) behind the Milky Way. The CO integrated intensity within the central ∼55" is only 1.6 K[T_R*]km/s, corresponding to an H₂ mass of 5.5x10⁶D/3Mpc)²M_☉ if the Galactic N(H₂)/I_CO conversion factor of 3x10²⁰cm^–2(K.km/s)^–1 is assumed. The weak CO emission relative to its HI emission could be due to a central molecular hole, an unusual N(H₂)/I_CO conversion factor, or a truly anomalous molecular-to-atomic gas mass ratio in the galaxy.