Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/40597
 Title: The Environment of the Binary Neutron Star Merger GW170817 Authors: Levan, A. J.Lyman, J. D.Tanvir, N. R.Hjorth, J.Mandel, I.Stanway, E. R.Steeghs, D.Fruchter, A. S.Troja, E.Schroder, S. L.Wiersema, K.Bruun, S. H.Cano, Z.Cenko, S. B.de Ugarte Postigo, A.Evans, P.Fairhurst, S.Fox, O. D.Fynbo, J. P. U.Gompertz, B.Greiner, J.Im, M.Izzo, L.Jakobsson, P.Kangas, T.Khandrika, H. G.Lien, A. Y.Malesani, D.O'Brien, P.Osborne, J. P.Palazzi, E.Pian, E.Perley, D. A.Rosswog, S.Ryan, R. E.Schulze, S.Sutton, P.Thone, C. C.Watson, D. J.Wijers, R. A. M. J. First Published: 16-Oct-2017 Publisher: American Astronomical Society, IOP Publishing Citation: Astrophysical Journal Letters, 2017, 848 (2) Abstract: We present Hubble Space Telescope (HST) and Chandra imaging, combined with Very Large Telescope MUSE integral field spectroscopy of the counterpart and host galaxy of the first binary neutron star merger detected via gravitational-wave emission by LIGO and Virgo, GW170817. The host galaxy, NGC 4993, is an S0 galaxy at z = 0.009783. There is evidence for large, face-on spiral shells in continuum imaging, and edge-on spiral features visible in nebular emission lines. This suggests that NGC 4993 has undergone a relatively recent ($\lesssim 1$ Gyr) "dry" merger. This merger may provide the fuel for a weak active nucleus seen in Chandra imaging. At the location of the counterpart, HST imaging implies there is no globular or young stellar cluster, with a limit of a few thousand solar masses for any young system. The population in the vicinity is predominantly old with lesssim1% of any light arising from a population with ages $\lt 500\,\mathrm{Myr}$. Both the host galaxy properties and those of the transient location are consistent with the distributions seen for short-duration gamma-ray bursts, although the source position lies well within the effective radius (${r}_{e}\sim 3$ kpc), providing an r e -normalized offset that is closer than $\sim 90 \%$ of short GRBs. For the long delay time implied by the stellar population, this suggests that the kick velocity was significantly less than the galaxy escape velocity. We do not see any narrow host galaxy interstellar medium features within the counterpart spectrum, implying low extinction, and that the binary may lie in front of the bulk of the host galaxy. DOI Link: 10.3847/2041-8213/aa905f ISSN: 2041-8205 eISSN: 2041-8213 Links: http://iopscience.iop.org/article/10.3847/2041-8213/aa905f/metahttp://hdl.handle.net/2381/40597 Version: Publisher Version Status: Peer-reviewed Type: Journal Article Rights: Copyright © the authors, 2017. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Appears in Collections: Published Articles, Dept. of Physics and Astronomy

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