Major structures of the inner Galaxy delineated by 6.7-GHz methanol masers

Details Major structures of the inner Galaxy delineated by 6.7-GHz methanol masers Major structures of the inner Galaxy delineated by 6.7-GHz methanol masers

2011-03-21

arxiv.org/abs/1103.3913v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

35 pages, 11 figures. Accepted for publication in ApJ

Scientific paper

We explore the longitude-velocity distribution of 6.7-GHz methanol masers in the context of the inner structure of our Galaxy. We analyse the correlation in velocities within this distribution and identify density enhancements indicating large-scale regions of enhanced star formation. These are interpreted as the starting points of the spiral arms and the interaction of the Galactic bar with the 3-kpc arms. The methanol masers support the presence of a long thin bar with a 45 degree orientation. Signatures of the full 3-kpc arm structure are seen, including a prominent tangent at approximately -22 degrees Galactic longitude. We compare this distribution with existing models of the gas dynamics of our Galaxy. The 3-kpc arm structure appears likely to correspond to the radius of corotation resonance of the bar, with the bar on its inner surface and the starting points of the spiral arms on its outer surface.

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