Gradual approach to coalescence for compact stars orbiting massive black holes

Hils, D.; Bender, P. L.

doi:10.1086/187876

Cited by 137 publications

(160 citation statements)

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“…However, the SDSS spectra do not have sufficient resolution to measure the dispersion in this black-hole mass range, so this extrapolation should not be trusted. Hils and Bender [18] estimate the white dwarf capture rate to be a factor of 150 smaller than our extrapolation from Freitag, but they assume an adiabatic central density profile and only half the number of white dwarfs that modern IMFs predict. Sigurdsson and Rees [15] predict a rate that is a factor of 50 lower than Freitag's, but their central cusps were not fully self-consistent and they ignored mass segregation.…”

Section: Capture Event Ratecontrasting

confidence: 64%

Event rate estimates for LISA extreme mass ratio capture sources

Gair

Barack²,

Creighton

et al. 2004

Class. Quantum Grav.

237

421

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One of the most exciting prospects for the LISA gravitational wave observatory is the detection of gravitational radiation from the inspiral of a compact object into a supermassive black hole. The large inspiral parameter space and low amplitude of the signal make detection of these sources computationally challenging. We outline here a first-cut data analysis scheme that assumes realistic computational resources. In the context of this scheme, we estimate the signal-to-noise ratio that a source requires to pass our thresholds and be detected. Combining this with an estimate of the population of sources in the universe, we estimate the number of inspiral events that LISA could detect. The preliminary results are very encouraging-with the baseline design, LISA can see inspirals out to a redshift z = 1 and should detect over a thousand events during the mission lifetime.

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Section: Capture Event Ratecontrasting

confidence: 64%

Event rate estimates for LISA extreme mass ratio capture sources

Gair

Barack²,

Creighton

et al. 2004

Class. Quantum Grav.

237

421

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“…The assumption of circular orbits is justified by the circularizing property of the gravitational waves [10], still interesting situations can occur in galactic nuclei, when freshly formed binary systems have not enough time to circularize [11,12]. The error produced by the neglection of the eccentricity during the search for gravitational waves was estimated to be substantial [13].…”

Section: Introductionmentioning

confidence: 99%

Gravitational radiation reaction in compact binary systems: Contribution of the magnetic dipole–magnetic dipole interaction

et al. 2003

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We study the gravitational radiation reaction in compact binary systems composed of neutron stars with spin and huge magnetic dipole moments (magnetars). The magnetic dipole moments undergo a precessional motion about the respective spins. At sufficiently high values of the magnetic dipole moments, their interaction generates second post-Newtonian order contributions both to the equations of motion and to the gravitational radiation escaping the system. We parametrize the radial motion and average over a radial period in order to find the secular contributions to the energy and magnitude of the orbital angular momentum losses, in the generic case of eccentric orbits. Similarly as for the spin-orbit, spin-spin, quadrupole-monopole interactions, here too we deduce the secular evolution of the relative orientations of the orbital angular momentum and spins. These equations, supplemented by the evolution equations for the angles characterizing the orientation of the dipole moments form a first order differential system, which is closed. The circular orbit limit of the energy loss agrees with Ioka and Taniguchi's earlier result.

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“…In this case, the capture rate of white dwarfs was found to be ∼ 2 − 3 × 10 −7 yr −1 and those of neutron stars and black holes about one order of magnitude lower. Analytical estimates of the capture rate were performed by [10], who have found, in particular for M32, a rate comparable to that obtained by [8]. Analytical and Monte Carlo methods were adopted by [11] and from their approach a typical event rate of few ×10 −9 yr −1 per galaxy was derived.…”

Section: Introductionmentioning

confidence: 94%

“…An early Monte Carlo simulation of the stellar random walk in Jspace was performed by [8], using parameters appropriate for the core of the dwarf elliptical M32, resulting in a event rate of 1.9×10 −8 yr −1 if compact stars are assumed to represent 10% of the total stellar population. Similar simulations were performed by [9] but for parameters appropriate to the galactic center.…”

Section: Introductionmentioning

confidence: 99%

Capture rates of compact objects by supermassive black holes

Pacheco

Filloux²,

Regimbau³

2006

Phys. Rev. D

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Capture rates of compact objects were calculated by using a recent solution of the Fokker-Planck equation in energy-space, including two-body resonant effects. The fraction of compact objects (white dwarfs, neutron stars and stellar black holes) was estimated as a function of the luminosity of the galaxy from a new grid of evolutionary models. Stellar mass densities at the influence radius of central supermassive black holes were derived from brightness profiles obtained by Hubble Space Telescope observations. The present study indicates that the capture rates scale as ∝ M −1.048 bh , consequence of the fact that dwarf galaxies have denser central regions than luminous objects. If the mass distribution of supermassive black holes has a lower cutoff at ∼ 1.4×10 6 M⊙ (corresponding to the lowest observed supermassive black hole mass, located in M32), then 9 inspiral events are expected to be seen by LISA (7-8 corresponding to white dwarf captures and 1-2 to neutron star and stellar black hole captures) after one year of operation. However, if the mass distribution extends down to ∼ 2 × 10 5 M⊙, then the total number of expected events increases up to 579 (corresponding to ∼ 274 stellar black hole captures, ∼ 194 neutron star captures and ∼ 111 white dwarf captures).

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Gradual approach to coalescence for compact stars orbiting massive black holes

Cited by 137 publications

References 0 publications

Event rate estimates for LISA extreme mass ratio capture sources

Event rate estimates for LISA extreme mass ratio capture sources

Gravitational radiation reaction in compact binary systems: Contribution of the magnetic dipole–magnetic dipole interaction

Capture rates of compact objects by supermassive black holes

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