A Distant Extended Spiral Arm in the Fourth Quadrant of the Milky Way
A Distant Extended Spiral Arm in the Fourth Quadrant of the Milky Way
Using data from the Southern Galactic Plane Survey, we present a possible distant spiral arm in the fourth quadrant of the Milky Way. The very distinct and cohesive feature can be traced for over 70° as the most extreme positive velocity feature in the longitude-velocity diagram. The feature is at …