Gravitational wave frequencies and energies in hypernovae

Details Gravitational wave frequencies and energies in hypernovae Gravitational wave frequencies and energies in hypernovae

2002-09-25

arxiv.org/abs/astro-ph/0209518v1

Astrophys.J. 583 (2003) 374-378

Astronomy and Astrophysics

Astrophysics

To appear in APJ

Scientific paper

10.1086/345094

A torus develops a state of suspended accretion against a magnetic wall around a rapidly rotating black hole formed in core-collapse hypernovae. It hereby emits about 10% of the black hole spin-energy in gravitational radiation from a finite number of multipole mass moments. We quantify the relation between the frequency of quadrupole gravitational radiation and the energy output $E_w$ in torus winds by $f_{gw}\simeq 470{Hz}(E_w/4\times 10^{52}{erg})^{1/2}(7M_\odot/M)^{3/2}$, where $M$ denotes the mass of the black hole. We propose that $E_w$ irradiates the remnant stellar envelope from within. We identify $E_w$ with energies $\sim 10^{52}$ erg inferred from X-ray observations on matter injecta; and the poloidal curvature in the magnetic wall with the horizon opening angle in baryon poor outflows that power true GRB energies of $E_\gamma\simeq 3\times 10^{51}$ erg.

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