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The Fate Of Cannibalized Fundamental-Plane Ellipticals, Martin D. Weinberg
The Fate Of Cannibalized Fundamental-Plane Ellipticals, Martin D. Weinberg
Astronomy Department Faculty Publication Series
Evolution and disruption of galaxies orbiting in the gravitational field of a larger cluster galaxy are driven by three coupled mechanisms: 1) the heating due to its time dependent motion in the primary; 2) mass loss due to the tidal strain field; and 3) orbital decay. Previous work demonstrated that tidal heating is effective well inside the impulse approximation limit. Not only does the overall energy increase over previous predictions, but the work is done deep inside the secondary galaxy, e.g. at or inside the half mass radius in most cases. Here, these ideas applied to cannibalization of elliptical galaxies …
Ricci Tensor Of Diagonal Metric, K. Z. Win
Ricci Tensor Of Diagonal Metric, K. Z. Win
Astronomy Department Faculty Publication Series
Efficient formulae of Ricci tensor for an arbitrary diagonal metric are presented.
High-Accuracy Minimum Relaxation N-Body Simulations Using Orthogonal Series Force Computation, Md Weinberg
High-Accuracy Minimum Relaxation N-Body Simulations Using Orthogonal Series Force Computation, Md Weinberg
Astronomy Department Faculty Publication Series
This report describes a modification of orthogonal function Poisson solver for n body simulations that minimize relaxation caused by small particle number fluctuations. With the standard algorithm, the noise leading to relaxation can e reduced by making the expansion basis similar to the particle distribution and by carefully choosing the maximum order in the expansion. The proposed algorithm accomplishes both task simultaneously while the simulation is running. This procedure is asymptotically equivalent to expanding in an orthogonal series which is matched to the distribution to start and truncating a low order. Because the modified algorithm adapts to a time evolving …
The Dynamics Of The Galatic Bar, Martin D. Weinberg
The Dynamics Of The Galatic Bar, Martin D. Weinberg
Astronomy Department Faculty Publication Series
No abstract provided.
The Global Rate And Efficiency Of Star Formation In Spiral Galaxies As A Function Of Morphology And Environment, Judith S. Young, Lori Allen, Jeffrey D.P. Kenney, Amy Lesser, Brooks Rownd
The Global Rate And Efficiency Of Star Formation In Spiral Galaxies As A Function Of Morphology And Environment, Judith S. Young, Lori Allen, Jeffrey D.P. Kenney, Amy Lesser, Brooks Rownd
Astronomy Department Faculty Publication Series
CCD images of Hα and R-band emission in 120 spiral galaxies were obtained using the now-retired No. 1-0.9 m telescope of Kitt Peak National Observatory. These images were used to derive the distribution and total flux of continuum-subtracted Hα line emission, and therefore the Hα surface brightnesses and high mass star formation rates in these galaxies. We find a small but significant variation in the mean Hα surface brightness for spiral galaxies along the Hubble sequence; the Sd-Ir galaxies exhibit a mean Hα surface brightness 1.4 times higher than the Sbc-Scd galaxies, and 2-3 times higher than the Sa-Sb galaxies. …