Rotating Halos and Spirals in Low Surface Brightness Galaxies

Chiueh, Tzihong; Tseng, Yi-Chuan

doi:10.1086/317178

Cited by 11 publications

(4 citation statements)

References 40 publications

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“…However, the sheet then becomes featureless again. This is due to rapid dynamical heating of the sheet which was already observed by Sellwood & Carlberg (1984) and in other numerical simulations of the dynamical evolution of galactic disks such as by Tomley et al (1991), Toomre (1990), Toomre & Kalnajs (1991), Chiueh & Tseng (2000). We illustrate the dynamical heating in Fig.…”

Section: Trial Runssupporting

confidence: 60%

“…11, there appears at time t = 1.13 a new strong wave at k = (1, 1) k crit . Non-linear coupling of density waves with different wave numbers, which led to recurrent density wave activity, has already been noted by Chiueh & Tseng (2000) in their simulations, although no detailed explanation was offered. They also find the decline of the amplitudes of density waves at given k y wave number which they ascribe to Landau damping.…”

Section: Non-linear Wave Couplingmentioning

confidence: 87%

“…In the next section a formal derivation is presented, while in the third section we describe numerical SCF simulations of the dynamical evolution of the shearing sheet and illustrate the feedback cycle with concrete examples. The SCF simulations are directly compared with N-body simulations of the dynamical evolution of the shearing sheet by Toomre (1990), Toomre & Kalnajs (1991) and Chiueh & Tseng (2000).…”

Section: Introductionmentioning

confidence: 99%

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Density waves in the shearing sheet

Fuchs¹,

Dettbarn²,

Tsuchiya³

2005

A&A

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Non-linear effects in the dynamical evolution of a shearing sheet made of stars are studied. First the implications of hitherto neglected nonlinearities of the Boltzmann equation for the dynamical evolution of the shearing sheet are investigated. Using a formalism developed previously on the basis of the linearized Boltzmann equation it is demonstrated that the inclusion of the non-linear term leads to a feedback cycle for swing amplified density waves in the unbounded shearing sheet. Such a feedback is unique to star disks and is not known for gas disks. In order to present concrete examples of the non-linear feedback cycle a SCF code was developed and numerical simulations of the dynamical evolution of the shearing sheet are performed. The numerical results seem to confirm the theoretical predictions. The evolution of the shearing sheet resembles closely and might actually explain the recurrent spiral instabilities found in large-scale numerical simulations of the dynamical evolution of galactic disks.

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Section: Trial Runssupporting

confidence: 60%

Section: Non-linear Wave Couplingmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Density waves in the shearing sheet

Fuchs¹,

Dettbarn²,

Tsuchiya³

2005

A&A

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show abstract

“…Physically, this anti-shielding potential may occur in some metastable media such as a dielectric at negative temperature [30]. Another, astrophysical application is the gravity "dressed" by a dark matter [31].…”

Section: A Potential Of the Tachyon Exchange Interactionmentioning

confidence: 99%