Soft Gamma-ray Repeaters and Anomolous
X-ray Pulsars within the Quark-Nova Scenario
by
DrBrian Niebergal(Univ. Calgary)
→
Europe/Stockholm
Description
In this talk I will present a new model
for Soft Gamma-ray Repeaters (SGRs) and Anomalous X-ray
Pulsars (AXPs) within the quark-nova scenario.
If an isolated neutron star experiences a Quark Nova explosion/transition
to a quark stars, an Iron-rich shell of degenerate matter
forms out of the fall-back (crust) material.
Our model can account for many of the observed features of SGRs
and AXPs such as: (i) the two types of bursts (giant and regular);
(ii) the spin-up and spin-down episodes during and following the bursts;
(iii) the energetics of the boxing day burst, SGR1806+20;
(iv) the presence of an Iron line as observed in SGR1900+14;
(v) the correlation between the far-Infrared and the X-ray
fluxes during the bursting episode and the quiescent phase; and
(vi) the hard X-ray component observed in SGRs during the giant bursts.
I will also discuss simulations of the alignment
(with the rotation axis) of the quark's star magnetic field
induced by the Meissner effect following the quark-nova.
This can naturally explain why SGRs and AXPs do not show
any pulsed radio-emission.