Density and Magnetic Field Evolution

Case D: Magnetized Anti-Aligned Spin: $\mathbf{\chi_{\rm \textbf{NS}} = a/m = -0.053}$

Here we look at the time evolution of the rest-mass density and magnetic fields. The rest-mass density is normalized to its initial central value. Time is measured in $M = 1.47 \times 10^{-2} (M_{NS} /1.625M_{\odot} ) \rm ms$. The neutron stars spiral inwards, forming a hypermassive neutron star (HMNS) and a disk of matter that orbits it. Eventually the HMNS undergoes delayed collapse, and a BH is formed. We can see that the white magnetic field lines become collimated above and below the BH, 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. The BH remnant has a final spin of $a_{BH}/M_{BH} \approx 0.77$

Fig. 1-1: Density, Magnetic Fields, and Spin	Fig. 1-2: Density and Magnetic Fields	Fig. 1-3: Density and Magnetic Fields
Fig. 1-4: Density and Magnetic Fields	Fig. 1-5: Density and Magnetic Fields	Fig. 1-6: Density and BH Remnant