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(No) dynamical constraints on the mass of the black hole in two ULXs
accretion accretion discs – X-rays binaries – black hole physics – binaries spectroscopic
2010/11/12
We present the preliminary results of two Gemini campaigns to constrain the mass of the black hole in an ultraluminous X-ray source (ULX) via optical spectroscopy. Pilot studies of the optical counter...
Recurrence plots and chaotic motion around Kerr black hole
black hole physics magnetic fields relativity
2010/11/15
We study the motion of charged test particles around a Kerr black hole immersed in the asymptotically uniform magnetic field, concluding that off-equatorial stable orbits are allowed in this system. B...
A Very Close Binary Black Hole in a Giant Elliptical Galaxy 3C 66B and its Black Hole Merger
Black Hole Giant Elliptical Galaxy 3C 66B Black Hole Merger
2010/11/15
In recent years the possibility of measuring the temporal change of radial and transverse position of sources in the sky in real time have become conceivable thanks to the thoroughly improved techniqu...
Iron lines in model disk spectra of galactic black hole binaries
model disk spectra galactic black hole binaries
2010/11/12
Context. We present angle-dependent, broad-band intensity spectra from accretion disks around black holes of 10 M⊙. In our computations disks are assumed to be slim, which means that the radial advect...
The black hole in NGC 1313 X-2
galaxies NGC 1313 – stars individual (NGC 1313 X-2) – X-rays binaries – X-rays galaxies – X-rays
2010/11/12
The amount of data available for NGC 1313 X-2 make it a cornerstone for the study of ultraluminous X-ray sources(ULXs). We modelled the optical and X-ray data of this ULX with a binary evolution code ...
The effect of coronal radiation on a residual inner disk in the low/hard spectral state of black hole X-ray binary systems
accretion accretion disks — black hole physics —X-rays bi-naries — X-rays stars
2010/11/15
Thermal conduction between a cool accretion disk and a hot inner corona can result in either evaporation of the disk or condensation of the hot corona. At low mass accretion rates, evaporation dominat...
The Murmur of The Hidden Monster: Chandra's Decadal View of The Super-massive Black Hole in M31
galaxies individual (M 31) – galaxies nuclei – X-rays galaxies
2010/11/11
The Andromeda galaxy (M31) hosts a central super-massive black hole (SMBH), known as M31∗, which is remarkable for its mass (108 M⊙) and extreme radiative quiescence. Over the past decade, the ...
Studies of Stellar Collapse and Black Hole Formation with the Open-Source Code GR1D
stellar collapse neutron stars black holes supernovae
2010/11/9
We discuss results from simulations of black hole formation in failing core-collapse
supernovae performed with the code GR1D, a new open-source Eulerian spherically-symmetric
general-relativistic hy...
Electromagnetic Counterparts to Black Hole Mergers
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/6
During the final moments of a binary black hole (BH) merger, the gravitational wave (GW) luminosity of the system is greater than the combined electromagnetic output of the entire observable universe.
Emergent Flux from Particle Collisions Near a Kerr Black Hole
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc)
2011/1/4
The escape fraction at infinity is evaluated for massless particles produced in collisions of weakly interacting particles accreted into a density spike near the particle horizon of an extremal Kerr b...
Variability of black-hole accretion discs: a theoretical study
Solar and Stellar Astrophysics (astro-ph.SR) Galaxy Astrophysics (astro-ph.GA)
2010/12/29
This thesis investigates phenomena occurring in black-hole accretion discs which are likely to induce high-frequency quasi-periodic variability. Two classes of pseudo-relativistic theoretical models a...
The angular momentum evolution of stars close to massive black holes (MBHs) is driven by secular torques. In contrast to two-body relaxation, where interactions between stars are incoherent, the resul...
The Spin of the Black Hole Microquasar XTE J1550-564 via the Continuum-Fitting and Fe-Line Methods
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/24
We measure the spin of XTE J1550-564 in two ways: by modelling the thermal continuum spectrum of the accretion disc, and independently by modeling the broad red wing of the reflection fluorescence Fe-...
The transition from quasar radio-loud to radio-quiet state in the framework of the black hole scalability hypothesis
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/23
There are several lines of evidence that active galactic nuclei (AGN) can be regarded as scaled-up X-ray binaries (XRB). The timescales of the evolutionary phenomena in these two classes are proportio...
A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?
Runaway Black Hole Gravitational Wave Slingshot Recoil
2010/3/9
We present a detailed study of a peculiar source in the COSMOS survey at z=0.359. Source CXOCJ100043.1+020637 (CID-42) presents two compact optical sources embedded in the same galaxy. The distance be...