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63 papers · 1 filter
Dipolar Dark Matter and Cosmology
Luc Blanchet, David Langlois, Alexandre Le Tiec +1
The phenomenology of the modified Newtonian dynamics (MOND) can be recovered from a mechanism of "gravitational polarization" of some dipolar medium playing the role of dark matter…
Three-Dimensional General Relativistic Radiation Magnetohydrodynamical Simulation of Super-Eddington Accretion, using a new code HARMRAD with M1 Closure
Jonathan C. McKinney, Alexander Tchekhovskoy, Aleksander Sadowski +1
Black hole (BH) accretion flows and jets are dynamic hot relativistic magnetized plasma flows whose radiative opacity can significantly affect flow structure and behavior. We descr…
Modelling the broad Fe Kα reverberation in the AGN NGC 4151
E. M. Cackett, A. Zoghbi, C. Reynolds +4
The recent detection of X-ray reverberation lags, especially in the Fe Kα line region, around Active Galactic Nuclei (AGN) has opened up the possibility of studying the time-resolv…
Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
J. Garcia, T. Dauser, A. Lohfink +8
X-ray reflection models are used to constrain the properties of the accretion disk, such as the degree of ionization of the gas and the elemental abundances. In combination with ge…
Transient jet formation and state transitions from large-scale magnetic reconnection in black hole accretion discs
Jason Dexter, Jonathan C. McKinney, Sera Markoff +1
Magnetically arrested accretion discs (MADs), where the magnetic pressure in the inner disc is dynamically important, provide an alternative mechanism for regulating accretion to w…
The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
Aaron D. Ludlow, Julio F. Navarro, Raul E. Angulo +4
We use the Millennium Simulation series to investigate the mass and redshift dependence of the concentration of equilibrium cold dark matter (CDM) halos. We extend earlier work on…