Observational evidence for extended emission to GW170817

被引：23

作者：

van Putten, Maurice H. P. M. ^{[1
]}

Della Valle, Massimo ^{[2
,3
]}

机构：

[1] Sejong Univ, Phys & Astron, 98 Gunja Dong, Seoul 143747, South Korea

[2] Osservatorio Astron Capodimonte OACN, Ist Nazl Astrofis, I-80131 Naples, Italy

[3] Inst Astrofis Andalucia, E-18080 Granada, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 482卷 / 01期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

gravitational waves; methods: data-analysis; stars: neutron; gamma-ray bursts: individual: GRB170817A; STAR MERGER GW170817; GAMMA-RAY BURSTS; GRAVITATIONAL-WAVES; MILLISECOND PULSARS; BLACK-HOLES; ACCRETION; ORIGIN; MASSES;

D O I：

10.1093/mnrasl/sly166

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 5.1 sigma. The merger produced a hypermassive neutron star or 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 tau(s) = 3.01 +/- 0.2 s in a (H1, L1)-spectrogram up to 700 Hz with Gaussian equivalent level of confidence greater than 3.3 sigma 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 1 kHz indicate a hypermassive magnetar rather than a black hole, spinning down by magnetic winds and interactions with dynamical mass ejecta.

引用

页码：L46 / L49

页数：4

共 61 条

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