A Distant Extended Spiral Arm in the Fourth Quadrant of the Milky Way
作者： N. M. McClure-Griffiths , John M. Dickey , B. M. Gaensler , A. J. Green
DOI: 10.1086/422031
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摘要: Using data from the Southern Galactic Plane Survey, we present a possible distant spiral arm in fourth quadrant of Milky Way. The very distinct and cohesive feature can be traced for over 70° as most extreme positive velocity longitude-velocity diagram. is at radius between 18 24 kpc appears to last major structure before end H I disk. We compare with model show that it well reproduced by pitch angle i ~ 9°. quite confined plane, dropping 1 below equator. Over its length, 1-2 thick.
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