Evidence for a two-armed spiral in the Milky Way

Details Evidence for a two-armed spiral in the Milky Way Evidence for a two-armed spiral in the Milky Way

2000-05-11

arxiv.org/abs/astro-ph/0005241v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication by A&A Letters

Scientific paper

Emission profiles of the Galactic plane in K and at $240\micron$ are presented, and features associated with the tangents of the spiral arms are identified. In the K band, which traces stellar emission and suffers little from absorbtion, features associated with the arm tangents indicate that a two-armed logarithmic spiral dominates the nonaxisymmetric structure of the Milky Way. In contrast, the $240\micron$ emission from dust entrained in the interstellar gas is consistent with a four-armed model, in concordance with radio data and optical spiral tracers. This suggests that the non-axisymmetric mass perturbation responsible for the four-armed spiral structure in the gas has a two rather than four-armed structure.

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