Structure and Dynamics of the Milky Way: an Astro2010 Science White Paper

Details Structure and Dynamics of the Milky Way: an Astro2010 Science White Paper Structure and Dynamics of the Milky Way: an Astro2010 Science White Paper

2009-02-23

arxiv.org/abs/0902.3928v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

8 pages, 2 figures; revised calculation of target/calibrator separation improvement

Scientific paper

Recent advances in radio astrometry with the VLBA have resulted in near micro-arcsecond accurate trigonometric parallax and proper motion measurements for masers in star forming regions. We are now poised to directly measure the full 3-dimensional locations and motions of every massive star forming region in the Milky Way and for the first time to map its spiral structure. Such measurements would also yield the full kinematics of the Milky Way and determine its fundamental parameters (Ro and To) with 1% accuracy. Coupled with other observations this would yield the distribution of mass among the various components (including dark matter) of the Milky Way.

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