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Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
Avery E. Broderick, Abraham Loeb
The silhouette cast by the horizon of the supermassive black hole in M87 can now be resolved with the emerging millimeter very-long baseline interferometry (VLBI) capability. Despi…
Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI
Sheperd S. Doeleman, Vincent L. Fish, Avery E. Broderick +2
The super massive black hole candidate, Sagittarius A*, exhibits variability from radio to X-ray wavelengths on time scales that correspond to < 10 Schwarzschild radii. We survey t…
Estimating the Parameters of Sgr A*'s Accretion Flow Via Millimeter VLBI
Avery E. Broderick, Vincent L. Fish, Sheperd S. Doeleman +1
Recent millimeter-VLBI observations of Sagittarius A* (Sgr A*) have, for the first time, directly probed distances comparable to the horizon scale of a black hole. This provides un…
Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI
Vincent L. Fish, Sheperd S. Doeleman, Avery E. Broderick +2
Multiwavelength monitoring observations of Sagittarius A* exhibit variability on timescales of minutes to hours, indicating emission regions localized near the event horizon. (Sub)…
Embedded Oscillating Starless Cores
Avery E. Broderick, Ramesh Narayan, Eric Keto +1
In a previous paper we demonstrated that non-radial hydrodynamic oscillations of a thermally-supported (Bonnor-Ebert) sphere embedded in a low-density, high-temperature medium pers…
Limits on the Position Wander of Sgr A*
Mark J. Reid, Avery E. Broderick, Abraham Loeb +2
We present measurements with the VLBA of the variability in the centroid position of Sgr A* relative to a background quasar at 7-mm wavelength. We find an average centroid wander o…
Oscillating Starless Cores: The Nonlinear Regime
Avery E. Broderick, Eric Keto, Charles J. Lada +1
In a previous paper, we modeled the oscillations of a thermally-supported (Bonnor-Ebert) sphere as non-radial, linear perturbations following a standard analysis developed for stel…
Magnetic Helicity and the Relaxation of Fossil Fields
Avery E. Broderick, Ramesh Narayan
In the absence of an active dynamo, purely poloidal magnetic field configurations are unstable to large-scale dynamical perturbations, and decay via reconnection on an Alfvenic tim…
Testing General Relativity with High-Resolution Imaging of Sgr A*
Avery Broderick, Abraham Loeb
Submilliarcsecond astrometry and imaging of the black hole Sgr A* at the Galactic Center may become possible in the near future at infrared and submillimetre wavelengths. This reso…
Oscillations of starless cores
Eric Keto, Avery Broderick, Charles J. Lada +1
If the split, asymmetric molecular spectral line profiles that are seen in many starless cores are interpreted as indicative of global collapse or expansion of the core then one po…
On The Nature of the Compact Dark Mass at the Galactic Center
Avery E. Broderick, Ramesh Narayan
We consider a model in which Sgr A*, the 3.5x10^6 M_sun supermassive black hole candidate at the Galactic Center, is a compact object with a surface. Given the very low quiescent l…
Radiative Transfer Along Rays in Curved Spacetimes
Avery E. Broderick
Radiative transfer in curved spacetimes has become increasingly important to understanding high-energy astrophysical phenomena and testing general relativity in the strong field li…
Imaging Optically-Thin Hot Spots Near the Black Hole Horizon of Sgr A* at Radio and Near-Infrared Wavelengths
Avery E. Broderick, Abraham Loeb
Sub milli-arcsecond astrometry and imaging of the black hole Sgr A* at the Galactic centre may become possible in the near future at infrared and sub-millimetre wavelengths. Motiva…
Frequency-Dependent Shift in the Image Centroid of the Black Hole at the Galactic Center as a Test of General Relativity
Avery E. Broderick, Abraham Loeb
The inferred black hole in the Galactic center spans the largest angle on the sky among all known black holes. Forthcoming observational programs plan to localize or potentially re…
Imaging Bright Spots in the Accretion Flow Near the Black Hole Horizon of Sgr A*
Avery E. Broderick, Abraham Loeb
Images from the vicinity of the black hole horizon at the Galactic centre (Sgr A*) could be obtained in the near future with a Very Large Baseline Array of sub-millimetre telescope…
A multi-dimensional, adiabatic, hydrodynamics code for studying tidal excitation
Avery E. Broderick, Yasser Rathore
We have developed a parallel, simple, and fast hydrodynamics code for multi-dimensional, self-gravitating, adiabatic flows. Our primary motivation is the study of the non-linear ev…
Supernovae in Helium Star--Compact Object Binaries: A Possible Gamma-ray Burst Mechanism
Avery E. Broderick
Helium star--compact object binaries, and helium star--neutron star binaries in particular, are widely believed to be the progenitors of the observed double neutron star systems. I…
Resonant Excitation of White Dwarf Oscillations in Compact Object Binaries: 1. The No Back Reaction Approximation
Yasser Rathore, Roger D. Blandford, Avery E. Broderick
We consider the evolution of white dwarfs with compact object companions (specifically black holes with masses up to 10^6 solar masses, neutron stars, and other white dwarfs). We s…
Covariant Magnetoionic Theory II: Radiative Transfer
Avery Broderick, Roger Blandford
Accretion onto compact objects plays a central role in high energy astrophysics. In these environments, both general relativistic and plasma effects may have significant impacts up…
General Relativistic Magnetoionic Theory
Avery Broderick, Roger Blandford
We have developed methods for tracing rays and performing radiative transfer through a magnetoactive plasma in a general relativistic environment. The two electromagnetic plasma mo…
A variational formalism for tidal excitation: non-rotating, homentropic stars
Yasser Rathore, Avery E. Broderick, Roger Blandford
We present a variational formalism for describing the dynamical evolution of an oscillating star with a point-mass companion in the linear, non-relativistic regime. This includes b…
Effects of Strong Magnetic Fields in Strange Baryonic Matter
A. E. Broderick, M. Prakash, J. M. Lattimer
We investigate the effects of very strong magnetic fields upon the equation of state of dense bayonic matter in which hyperons are present. In the presence of a magnetic field, the…
Compact Objects and Accretion Disks
Roger Blandford, Eric Agol, Avery Broderick +3
Recent developments in the spectropolarimetric study of compact objects, specifically black holes (stellar and massive) and neutron stars are reviewed. The lectures are organized a…
The Equation of State of Neutron-Star Matter in Strong Magnetic Fields
A. Broderick, M. Prakash, J. M. Lattimer
We study the effects of very strong magnetic fields on the equation of state (EOS) in multicomponent, interacting matter by developing a covariant description for the inclusion of…