Analytical Expressions for Spiral Arm Gravitational Potential and Density | Zendy

D. P. Cox | Zendy; Gilberto C. Gómez | Zendy

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Analytical Expressions for Spiral Arm Gravitational Potential and Density

Author(s) -

D. P. Cox,

Gilberto C. Gómez

Publication year - 2002

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/341946

Subject(s) - physics , gravitational field , gravitation , spiral (railway) , expression (computer science) , spiral galaxy , classical mechanics , gravitational potential , angular velocity , field (mathematics) , mechanics , astrophysics , stars , mathematical analysis , computer science , mathematics , pure mathematics , programming language

When modeling the three-dimensional hydrodynamics of interstellar materialrotating in a galactic gravitational potential, it is useful to have ananalytic expression for gravitational perturbations due to stellar spiral arms.We present such an expression for which changes in the assumed characteristicsof the arms can be made easily and the sensitivity of the hydrodynamics tothose characteristics examined. This analytic expression also makes it easy torotate the force field at the pattern angular velocity with little overhead onthe calculations.Comment: 23 pages, 15 figures. Accepted for publication in ApJ

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