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Antoniadis, J; Arzoumanian, Z; Babak, S; Bailes, M; Bak Nielsen, A-S; Baker, P T; Bassa, C G; Bécsy, B; Berthereau, A; Bonetti, M; et al(
, Monthly Notices of the Royal Astronomical Society)
ABSTRACT We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Australia. In our reference search for a power-law strain spectrum of the form $h_c = A(f/1\, \mathrm{yr}^{-1})^{\alpha }$, we found strong evidence for a spectrally similar low-frequency stochastic process of amplitude $A = 3.8^{+6.3}_{-2.5}\times 10^{-15}$ and spectral index α = −0.5 ± 0.5, where the uncertainties represent 95 per cent credible regions, using information from the auto- and cross-correlation terms between the pulsars in the array. For a spectral index of α =more »−2/3, as expected from a population of inspiralling supermassive black hole binaries, the recovered amplitude is $A = 2.8^{+1.2}_{-0.8}\times 10^{-15}$. None the less, no significant evidence of the Hellings–Downs correlations that would indicate a gravitational-wave origin was found. We also analysed the constituent data from the individual pulsar timing arrays in a consistent way, and clearly demonstrate that the combined international data set is more sensitive. Furthermore, we demonstrate that this combined data set produces comparable constraints to recent single-array data sets which have more data than the constituent parts of the combination. Future international data releases will deliver increased sensitivity to gravitational wave radiation, and significantly increase the detection probability.« less
Free, publicly-accessible full text available January 19, 2023
Hazboun, J. S.; Simon, J.; Taylor, S. R.; Lam, M. T.; Vigeland, S. J.; Islo, K.; Key, J. S.; Arzoumanian, Z.; Baker, P. T.; Brazier, A.; et al(
, The Astrophysical Journal)
Vallisneri, M.; Taylor, S. R.; Simon, J.; Folkner, W. M.; Park, R. S.; Cutler, C.; Ellis, J. A.; Lazio, T. J.; Vigeland, S. J.; Aggarwal, K.; et al(
, The Astrophysical Journal)
Aggarwal, K.; Arzoumanian, Z.; Baker, P. T.; Brazier, A.; Brook, P. R.; Burke-Spolaor, S.; Chatterjee, S.; Cordes, J. M.; Cornish, N. J.; Crawford, F.; et al(
, The Astrophysical Journal)
Aggarwal, K.; Arzoumanian, Z.; Baker, P. T.; Brazier, A.; Brinson, M. R.; Brook, P. R.; Burke-Spolaor, S.; Chatterjee, S.; Cordes, J. M.; Cornish, N. J.; et al(
, The Astrophysical Journal)
Abbott, R.; Abbott, T. D.; Acernese, F.; Ackley, K.; Adams, C.; Adhikari, N.; Adhikari, R. X.; Adya, V. B.; Affeldt, C.; Agarwal, D.; et al(
, The Astrophysical Journal)
Abstract We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC–2020 March 27 17:00 UTC). We conduct two independent searches: a generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds nomore »evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate.« less
Free, publicly-accessible full text available April 1, 2023
