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Paper: Three-Dimensional Distribution of the Neutral Hydrogen Gas in the Milky Way Galaxy
Volume: 317, Milky Way Surveys: The Structure and Evolution of Our Galaxy
Page: 32
Authors: Nakanishi, H.; Sofue, Y.
Abstract: We derived the three-dimensional distribution of H I gas in the Milky Way Galaxy using the latest H I survey data cubes and rotation curves. The distance of the H I gas was determined by the kinematic distance using a rotation curve. We solved the near-far problem in the inner Galaxy by a fitting method which involves introducing a model of vertical H I distribution. In our resultant maps we could trace three prominent arms: the Sagittarius-Carina arm, the Perseus arm, and the Outer arm. These three arms were found to be logarithmic spiral arms. The H I disk shows large and asymmetric warping in the outer disk. We also found that the H I outskirt is largely swelling in the fourth quadrant, and hence the Galaxy is significantly lopsided. The scale-height of the H I layer increases with the radius, and is correlated with the H I volume density at the centroid of the H I layer.
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