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      What Powered the Optical Transient AT2017gfo Associated with GW170817?

      , , ,

      The Astrophysical Journal

      American Astronomical Society

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          GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral

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            Observation of Gravitational Waves from a Binary Black Hole Merger

            On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of \(1.0 \times 10^{-21}\). It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1 {\sigma}. The source lies at a luminosity distance of \(410^{+160}_{-180}\) Mpc corresponding to a redshift \(z = 0.09^{+0.03}_{-0.04}\). In the source frame, the initial black hole masses are \(36^{+5}_{-4} M_\odot\) and \(29^{+4}_{-4} M_\odot\), and the final black hole mass is \(62^{+4}_{-4} M_\odot\), with \(3.0^{+0.5}_{-0.5} M_\odot c^2\) radiated in gravitational waves. All uncertainties define 90% credible intervals.These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger.
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              Type I supernovae. I - Analytic solutions for the early part of the light curve

               W. Arnett (1982)
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                Author and article information

                Journal
                The Astrophysical Journal
                ApJ
                American Astronomical Society
                2041-8213
                July 10 2018
                July 05 2018
                : 861
                : 2
                : L12
                Article
                10.3847/2041-8213/aace61
                © 2018

                http://iopscience.iop.org/info/page/text-and-data-mining

                http://iopscience.iop.org/page/copyright

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