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Accretion of low angular momentum material onto black holes: 2D hydrodynamical inviscid case
D. Proga, M. C. Begelman
We report on the first phase of our study of slightly rotating accretion flows onto black holes. We consider inviscid accretion flows with a spherically symmetric density distribut…
Heating, conduction and minimum temperatures in cooling flows
Mateusz Ruszkowski, Mitchell C. Begelman
There is mounting observational evidence from Chandra for strong interaction between keV gas and AGN in cooling flows. It is now widely accepted that the temperatures of cluster co…
Hiding in Plain Sight: Chandra Observations of the Quiescent Neutron Star 4U 2129+47 in Eclipse
Michael Nowak, Sebastian Heinz, Mitchell Begelman
During a previous outburst phase, the neutron star 4U 2129+47 exhibited evidence for a spatially extended corona via broad, partial X-ray eclipses occurring periodically on the 5.2…
Circular polarization from stochastic synchrotron sources
Mateusz Ruszkowski, Mitchell C. Begelman
The transfer of polarized radiation in stochastic synchrotron sources is explored by means of analytic treatment and Monte Carlo simulations. We argue that the main mechanism respo…
Magnetohydrodynamical Non-radiative Accretion Flows in Two-Dimensions
James M. Stone, James E. Pringle
We present the results of axisymmetric, time-dependent magnetohydrodynamic simulations of accretion flows around black holes. The calculations begin from a rotationally supported t…
Discovery of Recurring Soft to Hard State Transitions in LMC X-3
J. Wilms, M. A. Nowak, K. Pottschmidt +3
We present the analysis of an RXTE monitoring campaign of the canonical soft state black hole candidates LMC X-1 and LMC X-3. In contrast to LMC X-1, which does not exhibit any per…
RXTE Monitoring of LMC X-3: Recurrent Hard States
J. Wilms, M. A. Nowak, K. Pottschmidt +4
The black hole candidate LMC X-3 varies by a factor of four in the soft X-rays on a timescale of 200 or 100days. We have monitored LMC X-3 with RXTE in three to four week intervals…
Hydrodynamical Non-radiative Accretion Flows in Two-Dimensions
James M. Stone, James E. Pringle, Mitchell C. Begelman
Two-dimensional (axially symmetric) numerical hydrodynamical calculations of accretion flows which cannot cool through emission of radiation are presented. The calculations begin f…
RXTE Observation of Cygnus X-1: Spectral Analysis
James B. Dove, Jorn Wilms, Michael A. Nowak +2
We present the results of the analysis of the broad-band spectrum of Cygnus X-1 from 3.0 to 200 keV, using data from a 10 ksec observation by the Rossi X-ray Timing Explorer. The s…