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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 |
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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Seminar |
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Title
题目 |
Observational evidence for Extended Emission to GW170817 |
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Speaker
报告人 |
Maurice Van Putten |
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Affiliation
所在单位 |
Sejong University |
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Date
日期 |
10:00am, Sep 25, 2018, Tuesday |
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Venue
地点 |
Conference Room 6420, ITP new building |
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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. |
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Contact person
所内联系人 |
Hossein Yavartanoo |
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