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The Galactic plane has been mapped from l=34.75d to 45.25d and b=-5.25d to5.25d in the CO (J=1-0) emission with the 13.7 m telescope of the PurpleMountain Observatory. The unbiased survey covers a large area of 100 squaredegrees sampled every 30" with a velocity resolution of ~0.2km/s. In thispaper, we present the result of an unbiased CO survey of this longitude andlatitude range in the velocity range from -60km/s to -10km/s. Over 500molecular clouds (MCs) are picked out from the 12CO emission, and 131 of theseMCs are associated with 13CO emission.The distant MCs, which lie beyond thesolar circle and are mostly concentrated in the Galactic plane, trace thelarge-scale molecular gas structure over 10 degrees of Galactic azimuth. Wesuggest that the CO emission of the segment is from the Outer Arm. The physicalmid-plane traced by the Outer Arm seems to be slightly displaced from theIAU-defined plane on a large scale, which could be explained by the warpedplane at large Galactocentric distances of >~10 kpc and the apparent tiltedmid-plane to the projected IAU-defined plane caused by the Sun's z-height abovethe disk for distances near and within the Solar circle. If the inner plane ofour Galaxy is flat, we can derive an upper limit of the Sun's offset of ~17.1pc above the physical mid-plane of the Milky Way. We also discuss thecorrelations between the physical parameters of the distant MCs, which is quiteconsistent with the result of other studies of this parameter.

The Distant Outer Gas Arm Between l=35d and l=45d