publication . Article . Preprint . 2017 . Embargo end date: 30 Nov 2018

Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993

Palmese, A; Hartley, W; Tarsitano, F; Conselice, C; Lahav, O; Allam, S; Annis, J; Lin, H; Soares-Santos, M; Tucker, D; ...
Open Access
  • Published: 10 Nov 2017
  • Publisher: Apollo - University of Cambridge Repository
We present a study of NGC 4993, the host galaxy of the GW170817 gravitational wave event, the GRB170817A short gamma-ray burst (sGRB) and the AT2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC4993 is a nearby (40 Mpc) early-type galaxy, with $i$-band S\'ersic index $n=4.0$ and low asymmetry ($A=0.04\pm 0.01$). These properties are unusual for sGRB hosts. However, NGC4993 presents shell-like structures and dust lanes indicative of a recent galaxy merger, with the optical transient located close to a shell. We constra...
Persistent Identifiers
arXiv: Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Galaxy AstrophysicsAstrophysics::Earth and Planetary Astrophysics
free text keywords: astro-ph.HE, astro-ph.CO, astro-ph.GA, Astronomy & Astrophysics, Astronomical and Space Sciences, individual (NGC 4993) [galaxies], evolution [galaxies], structure [galaxies], gravitational waves, RCUK, STFC, AST-1138766, AST-1536171, galaxies: individual (NGC 4993), galaxies: evolution, galaxies: structure – gravitational waves, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies
Funded by
NSF| Collaborative Research: The Dark Energy Survey Data Management Operations
  • Funder: National Science Foundation (NSF)
  • Project Code: 1138766
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
Testing the Dark Energy Paradigm and Measuring Neutrino Mass with the Dark Energy Survey
  • Funder: European Commission (EC)
  • Project Code: 291329
  • Funding stream: FP7 | SP2 | ERC
Capitalizing on Gravitational Shear
  • Funder: European Commission (EC)
  • Project Code: 240672
  • Funding stream: FP7 | SP2 | ERC
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
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