Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-24
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, full resolution figures available on request or from Preprint P-MPA1651e on MPA web page. In: The Fate of
Scientific paper
Two- and three-dimensional simulations demonstrate that hydrodynamic instabilities can lead to low-mode (l=1,2) asymmetries of the fluid flow in the neutrino-heated layer behind the supernova shock. This provides a natural explanation for aspherical mass ejection and for pulsar recoil velocities even in excess of 1000 km/s. We propose that the bimodality of the pulsar velocity distribution might be a consequence of a dominant l=1 mode in case of the fast component, while higher-mode anisotropy characterizes the postshock flow and SN ejecta during the birth of the slow neutron stars. We argue that the observed large asymmetries of supernovae and the measured high velocities of young pulsars therefore do not imply rapid rotation of the iron core of the progenitor star, nor do they require strong magnetic fields to play a crucial role in the explosion. Anisotropic neutrino emission from accretion contributes to the neutron star acceleration on a minor level, and pulsar kicks do not make a good case for non-standard neutrino physics in the nascent neutron star.
Janka H.-Th.
Kifonidis Konstantinos
Mueller Ewald
Plewa Tomasz
Scheck Leonhard
No associations
LandOfFree
Supernova Asymmetries and Pulsar Kicks -- Views on Controversial Issues does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Supernova Asymmetries and Pulsar Kicks -- Views on Controversial Issues, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supernova Asymmetries and Pulsar Kicks -- Views on Controversial Issues will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-248797