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HEP Seminar: Multi-Messenger Signals from NS-NS Mergers

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HEP Seminar by He Gao (UNLV)
18 September 2013 from 2:30 PM to 4:00 PM
339 Davey Laboratory
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(814) 865-0418
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As the technology of gravitational-wave and neutrino detectors becomes increasingly mature, a multi-messenger era of astronomy is ushered in. Advanced gravitational wave detectors are close to making a ground-breaking discovery of gravitational wave bursts (GWBs) associated with mergers of double neutron stars (NS-NS). It is essential to study the possible electromagnetic (EM) and neutrino emission counterparts of these GWBs. Recent observations and numerical simulations suggest that at least a fraction of NS-NS mergers may leave behind a massive millisecond magnetar as the merger product. A huge additional energy budget from the magnetar would be released in different channels, making NS-NS mergers scenario an important multi-messenger astrophysical phenomenon. For instance, the near-isotropic magnetar wind would power a bright X-ray afterglow emission; the ejecta launched during the merger would firstly be heated up by the magnetar wind to produce a bright "merger-nova" peaking in the UV band and be accelerated even into relativistic regime, giving rise to broad band afterglow emission through strong external shock between the ejecta and the ISM; protons accelerated in the external shock would interact with photons generated in the dissipating magnetar wind and emit high energy neutrinos and photons. Observational strategy and likely evidence for the EM counterpart are also discussed.