3 research outputs found
Upper limits on a stochastic gravitational-wave background using LIGO and Virgo interferometers at 600-1000 Hz
A stochastic background of gravitational waves is expected to arise from a
superposition of many incoherent sources of gravitational waves, of either
cosmological or astrophysical origin. This background is a target for the
current generation of ground-based detectors. In this article we present the
first joint search for a stochastic background using data from the LIGO and
Virgo interferometers. In a frequency band of 600-1000 Hz, we obtained a 95%
upper limit on the amplitude of , of , assuming a value of the Hubble parameter
of . These new limits are a factor of seven better than the
previous best in this frequency band.Comment: 29 pages, 6 figures. For a repository of data used in the
publication, please see
https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=22210. Also see the
announcement for this paper at
http://www.ligo.org/science/Publication-S5VSR1StochIso
Predictions for the Rates of Compact Binary Coalescences Observable by Ground-based Gravitational-wave Detectors
International audienceWe present an up-to-date, comprehensive summary of the rates for all types of compact binary coalescence sources detectable by the Initial and Advanced versions of the ground-based gravitational-wave detectors LIGO and Virgo. Astrophysical estimates for compact-binary coalescence rates depend on a number of assumptions and unknown model parameters, and are still uncertain. The most confident among these estimates are the rate predictions for coalescing binary neutron stars which are based on extrapolations from observed binary pulsars in our Galaxy. These yield a likely coalescence rate of 100 per Myr per Milky Way Equivalent Galaxy (MWEG), although the rate could plausibly range from 1 per Myr per MWEG to 1000 per Myr per MWEG. We convert coalescence rates into detection rates based on data from the LIGO S5 and Virgo VSR2 science runs and projected sensitivities for our Advanced detectors. Using the detector sensitivities derived from these data, we find a likely detection rate of 0.02 per year for Initial LIGO-Virgo interferometers, with a plausible range between 0.0002 and 0.2 per year. The likely binary neutron-star detection rate for the Advanced LIGO-Virgo network increases to 40 events per year, with a range between 0.4 and 400 per year
Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1
We report the results of the first search for gravitational waves from
compact binary coalescence using data from the LIGO and Virgo detectors. Five
months of data were collected during the concurrent S5 (LIGO) and VSR1 (Virgo)
science runs. The search focused on signals from binary mergers with a total
mass between 2 and 35 Msun. No gravitational waves are identified. The
cumulative 90%-confidence upper limits on the rate of compact binary
coalescence are calculated for non-spinning binary neutron stars, black
hole-neutron star systems, and binary black holes to be 8.7x10^-3, 2.2x10^-3
and 4.4x10^-4 yr^-1 L_10^-1 respectively, where L_10 is 10^10 times the blue
solar luminosity. These upper limits are compared with astrophysical
expectations