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(Seminar) Observational evidence for Extended Emission to GW170817 |
2018-09-25
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CAS Key Laboratory of Theoretical Physics | Institute of Theoretical Physics | Chinese Academy of Sciences | Seminar | Title 题目 | Observational evidence for Extended Emission to GW170817 | Speaker 报告人 | Maurice Van Putten | Affiliation 所在单位 | Sejong University | Date 日期 | 10:00am, Sep 25, 2018, Tuesday | Venue 地点 | Conference Room 6420, ITP new building | Abstract 摘要 | The recent LIGO event GW170817 is the merger of a double neutron star system with an associated short GRB170817A with 2.9 ± 0.3 s soft emission over 8-70 keV. This association has a Gaussian equivalent level of confidence of 5.1σ. The merger produced a hyper-massive neutron star of stellar mass black hole with prompt or continuous energy output powering GRB170817A. Here, we report on a possible detection of Extended Emission (EE) in gravitational radiation during GRB170817A: a descending chirp with characteristic time scale τs = 3.01 ± 0.2?s in a (H1,L1)-spectrogram up to 700 Hz with Gaussian equivalent level of confidence greater than 3.3σ based on causality alone following edge detection applied to (H1,L1)-spectrograms merged by frequency coincidences. Additional confidence derives from the strength of this EE. The observed frequencies below 1kHz indicate a hyper-massive magnetar rather than a black hole, spinning down by magnetic winds and interactions with dynamical mass ejecta. | Contact person 所内联系人 | Hossein Yavartanoo |
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