Abstract
Giant molecular clouds in the outer arm of the Galaxy comparable in size and mass to the largest clouds in the inner Galaxy between R about 3 kpc and the solar circle have been detected in a new CO survey along the Galactic plane from l = 65 deg to 71 deg centered about b = + 1 deg. These objects at R about 12 kpc are underluminous in CO; the N(H2)/W(CO) ratio determined from either virial masses or the CO luminosity-line width relation is 4 + or - 2 times that in the inner Galaxy. When extrapolated to the entire Galaxy beyond R = 11 kpc, the present survey and related data yield a total molecular mass in the range (1-7) x 10 to the 8th solar masses. The outer arm complexes surveyed contain the two most luminous H II regions known beyond R about 10 kpc; one is the distant component of W58, and the other is a previously unidentified distant component of S98. 20 refs.
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