The electromagnetic counterpart of the binary neutron star merger LIGO/Virgo GW170817. I. discovery of the optical counterpart using the dark energy camera
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We present the Dark Energy Camera (DECam) discovery of the optical counterpart of the first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon as the localization region became accessible from Chile. We imaged 70 deg(2) in the i and z bands, covering 93% of the initial integrated localization probability, to a depth necessary to identify likely optical counterparts (e.g., a kilonova). At 11.4 hr post-merger we detected a bright optical transient located 10 ''.6 from the nucleus of NGC 4993 at redshift z = 0.0098, consistent (for H-0 = 70 km s(-1) Mpc(-1)) with the distance of 40 +/- 8 Mpc reported by the LIGO Scientific Collaboration and the Virgo Collaboration (LVC). At detection the transient had magnitudes of i = 17.3 and z = 17.4, and thus an absolute magnitude of M-i = -15.7, in the luminosity range expected for a kilonova. We identified 1500 potential transient candidates. Applying simple selection criteria aimed at rejecting background events such as supernovae, we find the transient associated with NGC 4993 as the only remaining plausible counterpart, and reject chance coincidence at the 99.5% confidence level. We therefore conclude that the optical counterpart we have identified near NGC 4993 is associated with GW170817. This discovery ushers in the era of multi-messenger astronomy with gravitational waves and demonstrates the power of DECam to identify the optical counterparts of gravitational-wave sources.
DOE (USA) NSF (USA) MEC/MICINN/MINECO (Spain) STFC (UK) HEFCE (UK) NCSA (UIUC) KICP (U. Chicago) CCAPP (Ohio State) MIFPA (Texas AM) CNPQ (Brazil) FAPERJ (Brazil) FINEP (Brazil) DFG (Germany) Argonne Lab University of Cambridge University of Chicago University College London DES-Brazil Consortium University of Edinburgh ETH Zurich Fermilab University of Illinois ICE (IEEC-CSIC) IFAE Barcelona Lawrence Berkeley Lab LMU Munchen Excellence Cluster Universe University of Michigan NOAO University of Nottingham Ohio State University University of Pennsylvania University of Portsmouth SLAC National Lab Stanford University University of Sussex Texas AM University OzDES Membership Consortium NSF AST-1138766 AST-1536171 PHYS-1708081 AST-1411763 AST-1714498 AST-1518052 MINECO AYA2015-71825 ESP2015-88861 FPA2015-68048 Centro de Excelencia SEV-2012-0234 SEV-2016-0597 MDM-2015-0509 ERC under the EU's 7th Framework Programme ERC 240672 291329 306478 Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) CE110001020 U.S. Department of Energy, Office of Science, Office of High Energy Physics DE-AC02-07CH11359 NSF CAREER PHY-1151836 Kavli Institute for Cosmological Physics at the University of Chicago through NSF PHY-1125897 NASA NNX15AE50G NNX16AC22G Kavli Foundation Danish National Research Foundation Niels Bohr International Academy DARK Cosmology Centre Gordon & Betty Moore Foundation Heising-Simons Foundation UCSC Alfred P. Sloan Foundation David and Lucile Packard Foundation CIEMAT-Madrid UC Santa Cruz
Artículo de publicación ISI
Quote ItemThe Astrophysical Journal Letters, 848:L16 (7pp), 2017
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