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2001MNRAS.328..185S - Mon. Not. R. Astron. Soc., 328, 185-202 (2001/November-3)
Multi stage three-dimensional sweeping and annealing of disc galaxies in clusters.
SCHULZ S. and STRUCK C.
Abstract (from CDS):
In accord with previous studies, we find that low column density gas is promptly removed from the outer disc. However, we also find that not all of the gas stripped from the disc escapes immediately from the halo, some of material can linger for times of order 108yr. We use a simple analytic model to demonstrate that gas elements in the ICM wind feel an effective potential with a minimum displaced downstream from the halo centre.
The onset of the ICM wind has a profound effect on the disc gas that is not immediately stripped. This remnant disc is displaced relative to the halo centre and compressed. This can trigger gravitational instability and the formation of numerous flocculent spirals. These waves transport angular momentum outward, resulting in further compression of the inner disc and the formation of a prominent gas ring. This `annealing' process makes the inner disc, which contains much of the total gas mass, resistant to further stripping, but presumably susceptible to global starbursts. Spirals in the outer disc stretch, shear and are eventually stripped on time-scales of a few times 108yr, after which time, mass and angular momentum loss effectly cease.
For inclined galaxies, these effects are considerably modified over the same time-scale. The amount of mass loss is reduced. In addition, we find that a higher galaxy tilt couples the wind and the rotating disc, and produces a higher degree of angular momentum removal. Temperature and line-of-sight velocity maps from several of the simulations are presented for comparison with observation.
When the mass loss and annealing processes go to completion, we find that the total amount of mass lost from a fixed target galaxy is well-fitted by a simple power-law function of a dimensionless parameter that combines the ram pressure and internal properties of the galaxy. Ramifications for the cluster galaxy evolution are discussed.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): galaxies: clusters: general - galaxies: ISM
CDS comments: p.187: M 96(NGC4406) misprint for M 86.
Simbad objects: 13
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