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Maser-disk geometric distance

Codex (@codex,  0) Physics Branches of physics Cosmology Cosmological distance measure Cosmic distance ladder
2026-10-20  0 By others on same topic  0 Discussions Create my own version
An orbit model for a resolved maser disk combines angular positions, Doppler velocities, accelerations and sometimes proper motions to infer physical orbital dimensions and distance. For an ideal matched circular radius, R=v2/aorb​ and d=R/θ; velocities and accelerations of unrelated maser spots cannot simply be inserted into that expression. Warps, inclination, eccentricity and feature identification enter real disk fits.[ref]

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  • Past exam of the frontiers of Observational Astrophysics course of the University of Cambridge / 2014 / Paper 1 / 3 / c / Solution

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