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Showing 1 to 20 of 22 for “"black hole binaries"”.
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MODELING X-RAY DATA OF BLACK HOLE BINARIES
… data from the 2005 hard state outburst of the black hole SWIFT J1753.5-0127. This system is both fairly bright and has fairly low interstellar absorption, so gives one of the best datasets to study the weak, cool disc emission in this state. We fit these data using models of an X-ray …
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Detectability of Self-Lensing Supermassive Black Hole Binaries in Quasars
… to be powered accretion into supermassive black holes (SMBHs) whose luminosity rivals that of their local galaxy. Since most galaxies are thought to contain SMBHs and galaxies commonly merge, it is likely that some AGN contain two SMBHs. While a few dual-AGN or supermassive black hole …
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Numerical Simulations Of Black Hole Binaries: Second Order Spectral Methods
… multi-domain second order scalar wave and single black hole evolutions demonstrate stability and convergence . The application of the new techniques to the evolution of a 16 orbit, equal mass black hole binary is currently underway. Preliminary results are discussed, which at this time show good …
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X-ray spectroscopic and timing studies of galactic black hole binaries
… similar X-ray properties - are classified as black hole binaries. In this thesis, I report on observations of black hole binaries made with satellite observatories in the X-ray band. The region closest to the black hole is revealed in X-rays due to the viscous heating of matter that is …
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Merging black hole binaries in gaseous environments: simulations in general-relativistic magnetohydrodynamics
Merging supermassive black hole-black hole (BHBH) binaries produced in galaxy mergers are promising sources of detectable gravitational waves. If such a merger takes place in a gaseous environment, there is a possibility of a simultaneous detection of electromagnetic and gravitational radiation, as …
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Mergers of Supermassive Black Hole Binaries in Gas-rich Environments: Models of Event Rates and Electromagnetic Signatures
Supermassive black holes permeate the observable Universe, residing in the nuclei of all or nearly all nearby massive galaxies and powering luminous quasars as far as ten billion light years away. These monstrous objects must grow through a combination of gas accretion and mergers of less massive …
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X-ray power density spectra of black hole binaries : a new deadtime model for the RXTE PCA
… to probe the details of accretion physics. For black hole binaries, the power density spectrum is useful in many important contexts: distinguishing black hole binaries from neutron star binaries, tracking the evolution of X-ray states, and understanding the dynamics of accretion disks, in …
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Merging neutron star and black hole binaries: Inference of their parameters and simulations of their formation and fate
<p>In recent years, the growing numbers of black hole and neutron star merger candidates observed by the Advanced LIGO (Laser Interferometer Gravitational-Wave Observatory) and Virgo gravitational-wave observatories are rapidly expanding the frontiers of astrophysics. The observations enable (i) …
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Black holes and how to find them : on the detection of compact objects at several scales
… to current detection methods for astrophysical black holes at different scales. The following three chapters correspond to different research projects regarding black hole detection. The second chapter presents the kinematic detection of a supermassive black hole at the center of the dwarf …
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Gravitational Wave prediction from Galactic binary populations for LISA
Galactic binaries, such as white dwarf binaries and black hole binaries, are expected to be the primary sources of gravitational waves (GWs) detectable by the Laser Interferometer Space Antenna (LISA). Detecting these sources provides an opportunity to unravel critical details about binary star …
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Rapid oscillations in cataclysmic variable stars
… oscillations in white dwarf, neutron star, and black hole binaries, and show that the recently recognized lpDNOs occur fairly commonly in high mass transfer rate CVs.
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Numerical Modelling of the Dynamics and Gravitational Radiation of Compact Binaries in General Relativity
… are self gravitating compact objects such as black holes (BH) and the precise modelling neutron stars (NS). The gravitational waves from the inspirals and collisions of BHs and NSs can be measured by large interferometer experiments such as the Laser Interferometer Gravitational-Wave …
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Gravitational waves as direct probes of binary evolution and astrophysical environments
… the detection of a merging heavy stellar-mass black-hole binary. Many such compact binaries have been detected since then and more massive black-hole mergers are expected to be detected as the rest of the gravitational-wave spectrum is opened up in the coming years and decades. Gravity itself, …
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DETECTION AND INFERENCE IN GRAVITATIONAL WAVE ASTRONOMY
… from binary neutron star and neutron star-black hole binaries. We use Bayesian inference to place upper limits on the rate of coalescence of these binaries. We use developments made in the PyCBC search pipeline during Advanced LIGO and Virgo’s second observing run to re-analyze Advanced …
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Source modelling at the dawn of gravitational-wave astronomy
… astrophysical events, such as the merger of two black holes and supernova explosions. The first detection of gravitational waves was performed in 2015 with the LIGO interferometers. This constitutes a tremendous breakthrough in fundamental physics and astronomy: it is not only the first direct …
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Spinning Black Hole Pairs: Dynamics and Gravitational Waves
Black hole binaries will be an important source of gravitational radiation for both ground-based and future space-based gravitational wave detectors. The study of such systems will offer a unique opportunity to test the dynamical predictions of general relativity when gravity is very strong. To …
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Topics in the Detection of Gravitational Waves from Compact Binary Inspirals
<p>Orbiting compact binaries - such as binary black holes, binary neutron stars and neutron star-black hole binaries - are among the most promising sources of gravitational waves observable by ground-based interferometric detectors. Despite numerous sophisticated engineering techniques, the …
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Gravitational collapse, compact objects and gravitational waves in General Relativity and modified gravity
… wave signal from the inspiral and merger of two black holes was detected. The following consistent detections (9 further black hole binaries and one neutron star system) and the introduction of the European interferometer Virgo, as well as other planned detectors such as KAGRA and IndiGO mark the …
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Deep learning methods for enabling real-time gravitational wave and multimessenger astrophysics
… including eccentric and spin-precessing compact binaries, which are essential to infer the astrophysical parameters of an event, are not available. Searches for unmodeled and anomalous signals do not have sufficient sensitivity compared to the targeted searches. Furthermore, existing search …
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