Zobrazeno 1 - 10
of 528
pro vyhledávání: '"Sellwood, J."'
Autor:
Sellwood, J A
When starting an N-body simulation of an isolated galaxy, it is desirable to select particles from a distribution function to ensure that the model is in equilibrium. Random sampling from a DF is widely used, but results in a set of particles that di
Externí odkaz:
http://arxiv.org/abs/2402.15435
Autor:
Sellwood, J A, Carlberg, R G
The problem of how some disk galaxies avoid forming bars remains unsolved. Many galaxy models having reasonable properties continue to manifest vigorous instabilities that rapidly form strong bars and no widely-accepted idea has yet been advanced to
Externí odkaz:
http://arxiv.org/abs/2302.14775
Autor:
Sellwood, J A, Carlberg, R G
This paper continues a series reporting different aspects of the behaviour of disc galaxy simulations that support spiral instabilities. The focus in this paper is to demonstrate how linear spiral instabilities saturate and decay, and how the propert
Externí odkaz:
http://arxiv.org/abs/2209.14256
Autor:
Sellwood, J. A., Sanders, R. H.
Recent 21 cm line observations of the ultra-diffuse galaxy AGC~114905 indicate a rotating disc largely supported against gravity by orbital motion, as usual. Remarkably, this study has revealed that the form and amplitude of the HI rotation curve is
Externí odkaz:
http://arxiv.org/abs/2202.08678
Autor:
Sellwood, J. A., Debattista, Victor P.
Any perturbation to a disc galaxy that creates a misalignment between the planes of the inner and outer disc, will excite a slowly evolving bending wave in the outer disc. The torque from the stiff inner disc drives a retrograde, leading-spiral bendi
Externí odkaz:
http://arxiv.org/abs/2110.13964
Autor:
Sellwood, J. A., Masters, Karen L.
Spirals in galaxies have long been thought to be caused by gravitational instability in the stellar component of the disk, but discerning the precise mechanism had proved elusive. Tidal interactions, and perhaps bars, may provoke some spiral response
Externí odkaz:
http://arxiv.org/abs/2110.05615
Autor:
Sellwood, J. A.
In order to address the question of whether spiral disturbances in galaxy discs are gravitationally coupled to the halo, we conduct simulations of idealized models of disc galaxies. We compare growth rates of spiral instabilities in identical mass mo
Externí odkaz:
http://arxiv.org/abs/2107.00599
Assessing the likelihood that the rotation curve of a galaxy matches predictions from galaxy formation simulations requires that the uncertainties in the circular speed as a function of radius derived from the observational data be statistically robu
Externí odkaz:
http://arxiv.org/abs/2101.02525
Autor:
Sellwood, J. A., Carlberg, R. G.
Publikováno v:
MNRAS, 500:5043 (2021)
We present a study of the spiral responses in a stable disc galaxy model to co-orbiting perturbing masses that are evenly spaced around rings. The amplitudes of the responses, or wakes, are proportional to the masses of the perturbations, and we find
Externí odkaz:
http://arxiv.org/abs/2011.03041
Autor:
Sellwood, J. A., Gerhard, Ortwin
We present simulations of bar-unstable stellar discs in which the bars thicken into box/peanut shapes. Detailed analysis of the evolution of each model revealed three different mechanisms for thickening the bars. The first mechanism is the well-known
Externí odkaz:
http://arxiv.org/abs/2005.05184