The Spiral Wave of Our Galaxy Near Inner Lindblad Resonance | Zendy

J.W.K. Mark | Zendy

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The Spiral Wave of Our Galaxy Near Inner Lindblad Resonance

Author(s) -

J.W.K. Mark

Publication year - 1971

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.68.9.2095

Subject(s) - physics , resonance (particle physics) , amplitude , wavelength , evanescent wave , density wave theory , dispersion (optics) , optics , atomic physics , astrophysics

The dispersion relationship for short-wavelength spiral density waves in our Galaxy has been refined to remove the divergences that occurred in wave number and in amplitude as inner Lindblad resonance is approached. The wave is found to be evanescent in an annular region near 4 kpc. By 3 kpc, the inward propagating trailing wave is completely absorbed. The outgoing leading wave is suppressed compared to the trailing one because it begins in the evanescent state. Throughout this region of inner Lindblad resonance, a smooth wave amplitude has been obtained, and it has a sharp peak correlating well with the observed density of ionized hydrogen.

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