Considerations on coincidence experiments between two gravitational wave detectors for sources in the Galactic Centre

We discuss the possibility that galactic gravitational wave sources might give burst signals at a rate of several events per year, detectable by state-of-the-art detectors. We are stimulated by the results of the data collected by the EXPLORER and NAUTILUS bar detectors in the 2001 run, which suggest an excess of coincidences between the two detectors, when the resonant bars are orthogonal to the galactic plane. Signals due to the coalescence of galactic compact binaries fulfill the energy requirements but are problematic for lack of known candidates with the necessary merging rate. We examine the limits imposed by galactic dynamics on the mass loss of the Galaxy due to GW emission, and we use them to put constraints also on the GW radiation from exotic objects, like binaries made of primordial black holes. We discuss the possibility that the events are due to GW bursts coming repeatedly from a single or a few compact sources. We examine different possible realizations of this idea, such as accreting neutron stars, strange quark stars, and the highly magnetized neutron stars ("magnetars") introduced to explain Soft Gamma Repeaters. Various possibilities are excluded or appear very unlikely, while others at present cannot be excluded.

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“…The dependence of θ on t has been given in eq. (10). In this appendix we perform the explicit computation, both for θ(t) and for ψ(t).…”

Section: Discussionmentioning

confidence: 99%

“…9 we show the result for a source located in the direction of the galactic center (a similar result is reported in ref. [10]). In this figure the envelope is sin 4 θ, i.e.…”

Section: B Polarized Gwsmentioning

confidence: 99%

Possible sources of gravitational wave bursts detectable today

2004

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“…As has been pointed out in several papers [17][18][19][20][21], the sidereal time analysis has the potentiality to enhance the sensitivity of a coincidence experiment: indeed, while the accidentals should be insensitive to this parameter, the GW events could have a distinctive distribution due to the source distribution in space.…”

Section: Resultsmentioning

confidence: 99%

The 2003 run of the EXPLORER–NAUTILUS gravitational wave experiment

Astone

Babusci

Ballantini

et al. 2006

Class. Quantum Grav.

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We report here the preliminary results of the search for gravitational wave bursts from the 2003 run of the EXPLORER-NAUTILUS experiment. The total common measuring time was 149 days. The detectors had a typical noise spectral amplitude of about 2 × 10 −21 Hz −1/2 , a bandwidth of the order of 10 Hz and a very good stability. We derive a new upper limit for the GW burst rate, of the order of 0.02 events/day for h RSS 2 × 10 −19 , and discuss the implication of this result with respect to the results obtained with the 2001 run.

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Recognition of gravitation impulses on a correlated non-Gaussian noise background

Gusev

Rudenko

2009

Moscow Univ. Phys.

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Considerations on coincidence experiments between two gravitational wave detectors for sources in the Galactic Centre

Cited by 3 publications

References 7 publications

Possible sources of gravitational wave bursts detectable today

Possible sources of gravitational wave bursts detectable today

The 2003 run of the EXPLORER–NAUTILUS gravitational wave experiment

Recognition of gravitation impulses on a correlated non-Gaussian noise background

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