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pro vyhledávání: '"Jason C. Speights"'
The net radial flow velocity of gas is an important parameter for understanding galaxy evolution. It is difficult to measure in the presence of the elliptical orbits of an oval distortion because the mathematical model describing the observed velocit
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1135b9df336d6ff1af159c6469c90d4
http://arxiv.org/abs/1909.03364
http://arxiv.org/abs/1909.03364
Autor:
Paul C. Rooke, Jason C. Speights
Theories that attempt to explain the dynamical relationship between bar and spiral patterns in galactic disks make different predictions about the radial profile of the pattern speed. These are tested for the H-alpha bar and spiral patterns of NGC 13
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a82f34a239c57a25ff251706a1eab07e
http://arxiv.org/abs/1606.04572
http://arxiv.org/abs/1606.04572
Autor:
Jason C. Speights, David J. Westpfahl
The pattern speeds of NGC 3031, NGC 2366, and DDO 154 are measured using a solution of the Tremaine-Weinberg equations derived in a previous paper. Four different data sets of NGC 3031 produce consistent results despite differences in angular resolut
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e5b2d2d65ff5417c6f64e6d484f096a
http://arxiv.org/abs/1205.0304
http://arxiv.org/abs/1205.0304
Autor:
David J. Westpfahl, Jason C. Speights
Publikováno v:
The Astrophysical Journal. 736:70
The Tremaine-Weinberg equations are solved for a pattern speed that is allowed to vary with radius. The solution method transforms an integral equation for the pattern speed to a least squares problem with well established procedures for statistical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0189736fe4ca239e39eea9d3f5403ec0
https://doi.org/10.1088/0004-637x/736/1/70
https://doi.org/10.1088/0004-637x/736/1/70
Publikováno v:
Astrophysical Journal; 9/20/2019, Vol. 883 Issue 1, p1-1, 1p
Autor:
Jason C. Speights, Paul C. Rooke
Publikováno v:
Astrophysical Journal; 7/20/2016, Vol. 826 Issue 1, p1-1, 1p