Zobrazeno 1 - 10
of 112
pro vyhledávání: '"MacFadyen, Andrew I."'
Autor:
Barnes, Jennifer, Duffell, Paul C., Liu, Yuqian, Modjaz, Maryam, Bianco, Federica B., Kasen, Daniel, MacFadyen, Andrew I.
Unusually high velocities (< ~0.1c) and correspondingly high kinetic energies have been observed in a subset of Type Ic supernovae (so-called "broad-lined Ic" supernovae; SNe Ic-BL), prompting a search for a central engine model capable of generating
Externí odkaz:
http://arxiv.org/abs/1708.02630
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 459, Issue 3, p.2379-2393, 07/2016
We study circumbinary accretion discs in the framework of the restricted three-body problem (R3Bp) and via numerically solving the height-integrated equations of viscous hydrodynamics. Varying the mass ratio of the binary, we find a pronounced change
Externí odkaz:
http://arxiv.org/abs/1512.05788
We use two-dimensional relativistic hydrodynamic numerical calculations to show that highly collimated relativistic jets can be produced in neutron star merger models of short-duration gamma ray bursts without the need for a highly directed engine or
Externí odkaz:
http://arxiv.org/abs/1505.05538
A reduced orbital period for the supermassive black hole binary candidate in the quasar PG 1302-102?
Publikováno v:
Monthly Notices of the Royal Astronomical Society 2015 452 (3): 2540-2545
Graham et al. (2015) have detected a 5.2 year periodic optical variability of the quasar PG 1302-102 at redshift $z=0.3$, which they interpret as the redshifted orbital period $(1+z)t_{\rm bin}$ of a putative supermassive black hole binary (SMBHB). H
Externí odkaz:
http://arxiv.org/abs/1502.03112
Publikováno v:
ApJ, 809, 39 (2015)
The merger of binary neutron stars (BNSs) can lead to large amplifications of the magnetic field due to the development of turbulence and instabilities in the fluid, such as the Kelvin-Helmholtz shear instability, which drive small-scale dynamo activ
Externí odkaz:
http://arxiv.org/abs/1410.0013
We present the results of 2D, moving mesh, viscous hydrodynamical simulations of accretion onto merging supermassive black hole (SMBH) binaries. We include viscous heating, shock heating, and radiative cooling, and simulate the transition from the "p
Externí odkaz:
http://arxiv.org/abs/1409.5124
Autor:
Duffell, Paul C., MacFadyen, Andrew I.
We demonstrate that the steep decay and long plateau in the early phases of gamma ray burst (GRB) X-ray afterglows are naturally produced in the collapsar model, by a means ultimately related to the dynamics of relativistic jet propagation through a
Externí odkaz:
http://arxiv.org/abs/1407.8250
Autor:
Duffell, Paul C., MacFadyen, Andrew I.
We describe a technique for improving the performance of hydrodynamics codes which employ a moving Voronoi mesh. Currently, such codes are susceptible to high-frequency noise produced by rapid adjustments in the grid topology on the smallest scales.
Externí odkaz:
http://arxiv.org/abs/1407.7300
We present the results of a calculation of the thermal spectrum from a 2D, moving mesh, high-accuracy, viscous hydrodynamical simulation of an accreting supermassive black hole binary. We include viscous heating, shock heating, and radiative cooling,
Externí odkaz:
http://arxiv.org/abs/1406.0007
Autor:
Duffell, Paul C., Haiman, Zoltan, MacFadyen, Andrew I., D'Orazio, Daniel J., Farris, Brian D.
Most standard descriptions of Type II migration state that massive, gap-opening planets must migrate at the viscous drift rate. This is based on the idea that the disk is separated into an inner and outer region and gas is considered unable to cross
Externí odkaz:
http://arxiv.org/abs/1405.3711