The Molecular Structures of the Local Arm and Perseus Arm in the Galactic Region of l = [139.°75, 149.°75], b = [−5.°25, 5.°25

Abstract

Abstract Using the Purple Mountain Observatory Delingha (PMODLH) 13.7 m telescope, we report a 96 deg2 12CO/13CO/C18O mapping observation toward the Galactic region of l = [139.°75,149.°75], b = [−5.°25, 5.°25]. The molecular structures of the Local Arm and Perseus Arm are presented. Combining H i data and part of the Outer Arm results, we obtain that the warp structure of both atomic and molecular gas is obvious, while the flare structure only exists in atomic gas in this observing region. In addition, five filamentary giant molecular clouds on the Perseus Arm are identified. Among them, four are newly identified. Their relations with the Milky Way large-scale structure are discussed.