Density and Magnetic Field Evolution

Density and Magnetic Field Evolution

Here we look at the time evolution of the rest-mass density and magnetic fields. The rest-mass density is normalized to the maximum density at $t/M = 230$. Time is measured in $M = 1.5 \times 10^{-2} (M_{NS} /1.625M_{\odot} ) \ ms$ . The neutron stars spirals inwards, forming a hypermassive neutron star (HMNS) and a disk of matter that orbits it. Eventually the HMNS undergoes delayed collapse, and a black hole is formed. We can see that the magnetic field lines become collimated above and below the black hole, and that matter is ejected at mildly relativistic speeds. The field lines above the poles form a helical funnel which drives and confines the matter in the jet.

Fig. 1-1: Density and magnetic fields at time t/M = 230
Fig. 1-1: Density and magnetic fields
Fig. 1-2: Density and magnetic fields at time t/M = 467
Fig. 1-2: Density and magnetic fields
Fig. 1-3: Density and magnetic fields at time t/M = 1599
Fig. 1-3: Density and magnetic fields
Fig. 1-4: Density and magnetic fields at time t/M = 1691
Fig. 1-4: Density and magnetic fields
Fig. 1-5: Density and magnetic fields at time t/M = 4606
Fig. 1-5: Density and magnetic fields
Fig. 1-6: Density and magnetic fields at time t/M = 4606
Fig. 1-6: Density and magnetic fields
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