A Distant Extended Spiral Arm in the Fourth Quadrant of the Milky Way

Details 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

2004-04-22

arxiv.org/abs/astro-ph/0404448v1

Astrophys.J. 607 (2004) L127-L130; Erratum-ibid. 611 (2004) L145

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures. To appear in ApJ Letters. Full resolution version available at http://www.atnf.csiro.au/people/nmcclure

Scientific paper

10.1086/422031

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 deg as the most extreme positive velocity feature in the longitude-velocity diagram. The feature is at a Galactic radius between 18 and 24 kpc and appears to be the last major structure before the end of the HI disk. We compare the feature with a Galactic spiral model and show that it is well reproduced by a spiral arm of pitch angle, i ~ 9 deg. The arm is quite well confined to the Galactic plane, dropping at most 1 kpc below the Galactic equator. Over most of its length the arm is 1 - 2 kpc thick.

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