Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..686...67m&link_type=abstract
THE ASTROPHYSICS OF GRAVITATIONAL WAVE SOURCES. AIP Conference Proceedings, Volume 686, pp. 67-73 (2003).
Astronomy and Astrophysics
Astrophysics
Wave Generation And Sources, Gamma-Ray Sources, Gamma-Ray Bursts, Relativity And Gravitation
Scientific paper
We discuss the gravitational wave signals from various proposed GRB progenitor models, in particular compact mergers and massive stellar collapses. These have in common a high angular rotation rate, and the final stage involves a rotating black hole and accretion disk system. We consider the in-spiral, merger and ringing phases, and for massive collapses we consider the possible effects of asymmetric collapse and break-up, as well bar-mode instabilities in the disks. We evaluate the order-of-magnitudes of the strain and frequency of the gravitational waves expected from various progenitors, at distances based on occurrence rate estimates. Based on simplifying assumptions, we give estimates of the probability of detection of gravitational waves by the advanced LIGO system from the different GRB scenarios. The photon emission of GRB appears to arise from collimated jets, with properties depending on the polar angle, which may be of relevance both for GRB and X-ray flashes. We consider the gravitational wave emission and its polarization as a function of angle relative to the rotation axis, which is thought to be aligned with the jet. We discuss possible correlations between the burst photon luminosity, or the delay between gravitational wave bursts and X-ray flashes, and the polarization degree of the gravitational waves.
Kobayashi Sachio
Meszaros Peter
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