The Spiral Structure of the Outer Milky Way in Hydrogen | Zendy

E. S. Levine | Zendy; Leo Blitz | Zendy; Carl Heiles | Zendy

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The Spiral Structure of the Outer Milky Way in Hydrogen

Author(s) -

E. S. Levine,

Leo Blitz,

Carl Heiles

Publication year - 2006

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1128455

Subject(s) - milky way , logarithmic spiral , spiral (railway) , radius , spiral galaxy , physics , galaxy , astrophysics , hydrogen , rotational symmetry , geometry , mechanics , mathematical analysis , mathematics , computer security , quantum mechanics , computer science

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

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