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For refcode 1996A&A...307..424L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...307..424L Research Note Detection of CO emission from Dwingeloo 1 Jonathan G. Li, Jun-Hui Zhao, Paul T.P. Ho, and Leslie J. Sage Institute of Astronomy & Astrophysics, Academia Sinica, P.O. Box i -87, Nankang, Taipei, Taiwan 115 Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA Department of Astronomy, University of Maryland, College Park, MD 20742, USA Received 18 July 1995/Accepted 26 July 1995 Abstract. 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^-1^, corresponding to an H_2_ mass of 5.5 x 10^6^ (D/3 Mpc)^2^ M_sun_ if the Galactic N(H_2_)/I_CO_ conversion factor of 3 x 10^20^ cm^-2^ (K km s^-1^)^-1^ is assumed. The weak CO emission relative to its HI emission could be due to a central molecular hole, an unusual N(H_2_)/I_CO_ conversion factor, or a truly anomalous molecular-to-atomic gas mass ratio in the galaxy. Key words: galaxies: individual: Dwingeloo 1 - galaxies: ISM - radio lines: galaxies
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