Semantic Scholar Open Access 2019 3080 sitasi

Multi-messenger Observations of a Binary Neutron Star Merger

B. Abbott R. Abbott T. Abbott F. Acernese K. Ackley +495 lainnya

Abstrak

On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ∼ 1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of 40 − 8 + 8 Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 M ⊙ . An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at ∼ 40 Mpc ) less than 11 hours after the merger by the One-Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ∼10 days. Following early non-detections, X-ray and radio emission were discovered at the transient’s position ∼ 9 and ∼ 16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC 4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta.

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Format Sitasi

Abbott, B., Abbott, R., Abbott, T., Acernese, F., Ackley, K., Adams, C. et al. (2019). Multi-messenger Observations of a Binary Neutron Star Merger. https://doi.org/10.3847/2041-8213/AA91C9

Akses Cepat

Lihat di Sumber doi.org/10.3847/2041-8213/AA91C9
Informasi Jurnal
Tahun Terbit
2019
Bahasa
en
Total Sitasi
3080×
Sumber Database
Semantic Scholar
DOI
10.3847/2041-8213/AA91C9
Akses
Open Access ✓