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(Seminar) Observational evidence for Extended Emission to GW170817
2018-09-25     Text Size:  A

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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