The Spiral Structure of the Outer Milky Way in Hydrogen

Details The Spiral Structure of the Outer Milky Way in Hydrogen The Spiral Structure of the Outer Milky Way in Hydrogen

2006-05-30

arxiv.org/abs/astro-ph/0605728v1

Astronomy and Astrophysics

Astrophysics

10 pages with 4 color figures. Accepted for publication in Science. Embargoed for discussion in the popular press until public

Scientific paper

10.1126/science.1128455

We produce a detailed map of the perturbed surface density of neutral hydrogen in the outer Milky Way disk demonstrating that the Galaxy is a non-axisymmetric multi-armed spiral. Spiral structure in the southern half of the Galaxy can be traced out to at least 25 kpc, implying a minimum radius for the gas disk. Overdensities in the surface density are coincident with regions of reduced gas thickness. The ratio of the surface density to the local median surface density is relatively constant along an arm. Logarithmic spirals can be fit to the arms with pitch angles of 20-25 degrees.

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