We derived a new three dimensional map of the HI gas distribution in the Milky Way Galaxy using the latest HI survey data and rotation curve. In our resultant map well known HI arms can be traced; the Sagittarius-Carina arm, the Perseus arm, and Outer arm. They are logarithmic spiral arms and each one has a different pitch angle. The outer HI disk is strongly warped and lopsided. We found that the HI layer tends to be thick at an inter-arm but thin at an arm.
8th Asian-Pacific Regional Meeting, Volume II
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