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The lack of arm tracers, especially the remote tracers, is one of the mostdifficult problems preventing us from studying the structure of the Milky Way.Fortunately, with its high-sensitivity CO survey, the Milky Way Imaging ScrollPainting (MWISP) project offers such an opportunity. Since completing aboutone-third of its mission, an area of l=[100,150] deg, b=[-3,5] deg has nearlybeen covered. The Outer arm of the Milky Way first clearly revealed its shapein the second galactic quadrant in the form of molecular gas --- this is thefirst time that the Outer arm has been reported in such a large-scale mappingof molecular gas. Using the 115 GHz 12CO(1-0) data of MWISP at the LSR velocity~= [-100,-60] km s^-1 and in the area mentioned above, we have detected 481molecular clouds in total, and among them 332 (about 69\%) are newly detectedand 457 probably belong to the Outer arm. The total mass of the detected Outerarm clouds is ~ 3.1*10^6 M_sun. Assuming that the spiral arm is a logarithmicspiral, the pitch angle is fitted as ~ 13.1 deg. Besides combining both the COdata from MWISP and the 21 cm HI data from the Canadian Galactic Plane Survey(CGPS), the gas distribution, warp, and thickness of the Outer arm are alsostudied.

An Outer Arm in the Second Galactic Quadrant: Structure