Localization of compact binary sources with second generation gravitational-wave interferometer networks

Pankow, C., Rizzo, M., Rao, K., Berry, C. P.L. and Kalogera, V. (2020) Localization of compact binary sources with second generation gravitational-wave interferometer networks. Astrophysical Journal, 902(1), 71. (doi: 10.3847/1538-4357/abb373)

Abstract

GW170817 began gravitational-wave multimessenger astronomy. However, GW170817 will not be representative of detections in the coming years because typical gravitational-wave sources will be closer the detection horizon, have larger localization regions, and (when present) will have correspondingly weaker electromagnetic emission. In its design state, the gravitational-wave detector network in the mid-2020s will consist of up to five similar-sensitivity second-generation interferometers. The instantaneous sky-coverage by the full network is nearly isotropic, in contrast to the configuration during the first three observing runs. Along with the coverage of the sky, there are also commensurate increases in the average horizon for a given binary mass. We present a realistic set of localizations for binary neutron stars and neutron star–black hole binaries, incorporating intra-network duty cycles and selection effects on the astrophysical distributions. Based on the assumption of an 80% duty cycle, and that two instruments observe a signal above the detection threshold, we anticipate a median of 28 sq. deg. for binary neutron stars, and 50–120 sq. deg. for neutron star–black hole (depending on the population assumed). These distributions have a wide spread, and the best localizations, even for networks with fewer instruments, will have localizations of 1–10 sq. deg. range. The full five instrument network reduces localization regions to a few tens of degrees at worst.

• Item Type: Articles
• Additional Information: The authors are supported by the NSF grants PHY-1607709 and PHY-1912648, and the Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA). This research was supported in part through the computational resources from the Grail computing cluster at Northwestern University—funded through NSF PHY-1726951—and staff contributions provided for the Quest high performance computing facility at Northwestern University which, is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Berry, Dr Christopher
• Authors: Pankow, C., Rizzo, M., Rao, K., Berry, C. P.L., and Kalogera, V.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Astrophysical Journal
• Publisher: IOP Publishing
• ISSN: 0004-637X
• ISSN (Online): 1538-4357
• Published Online: 13 October 2020
• Copyright Holders: Copyright © 2020 The American Astronomical Society
• First Published: First published in Astrophysical Journal 902(1): 71
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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