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Title: THE DISTRIBUTION OF COALESCING COMPACT BINARIES IN THE LOCAL UNIVERSE: PROSPECTS FOR GRAVITATIONAL-WAVE OBSERVATIONS

Abstract

Merging compact binaries are the most viable and best-studied candidates for gravitational-wave (GW) detection by the fully operational network of ground-based observatories. In anticipation of the first detections, the expected distribution of GW sources in the local universe is of considerable interest. Here we investigate the full phase-space distribution of coalescing compact binaries at z = 0 using dark matter simulations of structure formation. The fact that these binary systems acquire large barycentric velocities at birth ('kicks') results in merger site distributions that are more diffusely distributed with respect to their putative hosts, with mergers occurring out to distances of a few Mpc from the host halo. Redshift estimates based solely on the nearest galaxy in projection can, as a result, be inaccurate. On the other hand, large offsets from the host galaxy could aid the detection of faint optical counterparts and should be considered when designing strategies for follow-up observations. The degree of isotropy in the projected sky distributions of GW sources is found to be augmented with increasing kick velocity and to be severely enhanced if progenitor systems possess large kicks as inferred from the known population of pulsars and double compact binaries. Even in the absence ofmore » observed electromagnetic counterparts, the differences in sky distributions of binaries produced by disparate kick-velocity models could be discerned by GW observatories, within the expected accuracies and detection rates of advanced LIGO-in particular with the addition of more interferometers.« less

Authors:
;  [1];  [2];  [3];  [4]
  1. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  2. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)
  3. Institute for Theoretical Physics, University of Zurich, 8057 Zurich (Switzerland)
  4. MIT Kavli Institute, Cambridge, MA 02139 (United States)
Publication Date:
OSTI Identifier:
21454908
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 725; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/725/1/L91; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; GRAVITATIONAL WAVES; INTERFEROMETERS; ISOTROPY; NEUTRONS; NONLUMINOUS MATTER; PHASE SPACE; PULSARS; RED SHIFT; SIMULATION; STARS; UNIVERSE; BARYONS; COSMIC RADIO SOURCES; ELEMENTARY PARTICLES; FERMIONS; HADRONS; MATHEMATICAL SPACE; MATTER; MEASURING INSTRUMENTS; NUCLEONS; SPACE

Citation Formats

Kelley, Luke Zoltan, Ramirez-Ruiz, Enrico, Zemp, Marcel, Diemand, Juerg, and Mandel, Ilya, E-mail: lzkelley@ucsc.ed. THE DISTRIBUTION OF COALESCING COMPACT BINARIES IN THE LOCAL UNIVERSE: PROSPECTS FOR GRAVITATIONAL-WAVE OBSERVATIONS. United States: N. p., 2010. Web. doi:10.1088/2041-8205/725/1/L91.
Kelley, Luke Zoltan, Ramirez-Ruiz, Enrico, Zemp, Marcel, Diemand, Juerg, & Mandel, Ilya, E-mail: lzkelley@ucsc.ed. THE DISTRIBUTION OF COALESCING COMPACT BINARIES IN THE LOCAL UNIVERSE: PROSPECTS FOR GRAVITATIONAL-WAVE OBSERVATIONS. United States. doi:10.1088/2041-8205/725/1/L91.
Kelley, Luke Zoltan, Ramirez-Ruiz, Enrico, Zemp, Marcel, Diemand, Juerg, and Mandel, Ilya, E-mail: lzkelley@ucsc.ed. Fri . "THE DISTRIBUTION OF COALESCING COMPACT BINARIES IN THE LOCAL UNIVERSE: PROSPECTS FOR GRAVITATIONAL-WAVE OBSERVATIONS". United States. doi:10.1088/2041-8205/725/1/L91.
@article{osti_21454908,
title = {THE DISTRIBUTION OF COALESCING COMPACT BINARIES IN THE LOCAL UNIVERSE: PROSPECTS FOR GRAVITATIONAL-WAVE OBSERVATIONS},
author = {Kelley, Luke Zoltan and Ramirez-Ruiz, Enrico and Zemp, Marcel and Diemand, Juerg and Mandel, Ilya, E-mail: lzkelley@ucsc.ed},
abstractNote = {Merging compact binaries are the most viable and best-studied candidates for gravitational-wave (GW) detection by the fully operational network of ground-based observatories. In anticipation of the first detections, the expected distribution of GW sources in the local universe is of considerable interest. Here we investigate the full phase-space distribution of coalescing compact binaries at z = 0 using dark matter simulations of structure formation. The fact that these binary systems acquire large barycentric velocities at birth ('kicks') results in merger site distributions that are more diffusely distributed with respect to their putative hosts, with mergers occurring out to distances of a few Mpc from the host halo. Redshift estimates based solely on the nearest galaxy in projection can, as a result, be inaccurate. On the other hand, large offsets from the host galaxy could aid the detection of faint optical counterparts and should be considered when designing strategies for follow-up observations. The degree of isotropy in the projected sky distributions of GW sources is found to be augmented with increasing kick velocity and to be severely enhanced if progenitor systems possess large kicks as inferred from the known population of pulsars and double compact binaries. Even in the absence of observed electromagnetic counterparts, the differences in sky distributions of binaries produced by disparate kick-velocity models could be discerned by GW observatories, within the expected accuracies and detection rates of advanced LIGO-in particular with the addition of more interferometers.},
doi = {10.1088/2041-8205/725/1/L91},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 725,
place = {United States},
year = {2010},
month = {12}
}