621 citations · 1k across the 18 of their papers we have counts for
18 papers
Numerical MHD Codes for Modeling Astrophysical Flows
A. V. Koldoba, G. V. Ustyugova, P. S. Lii +4
We describe a Godunov-type magnetohydrodynamic (MHD) code based on the Miyoshi and Kusano (2005) solver which can be used to solve various astrophysical hydrodynamic and MHD proble…
Instability of counter-rotating stellar disks
Robert G. Hohlfeld, Richard V. E. Lovelace
We use an N-body simulation, constructed using GADGET-2, to investigate an accretion flow onto an astrophysical disk that is in the opposite sense to the disk's rotation. In order…
Boundary Between Stable and Unstable Regimes of Accretion
A. A. Blinova, R. V. E. Lovelace, M. M. Romanova
We investigated the boundary between stable and unstable regimes of accretion and its dependence on different parameters. Simulations were performed using a "cubed sphere" code wit…
Vertical Structure of Stationary Accretion Disks with a Large-Scale Magnetic Field
G. S. Bisnovatyi-Kogan, R. V. E. Lovelace
In earlier works we pointed out that the disk's surface layers are non-turbulent and thus highly conducting (or non-diffusive) because the hydrodynamic and/or magnetorotational (MR…
Measurement of the Electric Current in a Kpc-Scale Jet
Philipp P. Kronberg, Richard V. E. Lovelace, Giovanni Lapenta +1
We present radio emission, polarization, and Faraday rotation maps of the radio jet of the galaxy 3C303. From this data we derive the magnetoplasma and electrodynamic parameters of…
Ring Formation from an Oscillating Black Hole
R. V. E. Lovelace, D. A. Kornreich
Massive black hole (BH) mergers can result in the merger remnant receiving a "kick", of order 200 km s or more, which will cause the remnant to oscillate about the galaxy ce…
Planet Migration and Disk Destruction due to Magneto-Centrifugal Stellar Winds
R. V. E. Lovelace, M. M. Romanova, A. W. Barnard
This paper investigates the influence of magneto-centrifugally driven or simply magnetic winds of rapidly-rotating, strongly-magnetized T Tauri stars in causing the inward or outwa…
Negative Energy and Angular Momentum Modes of Thin Accretion Disks
L. Zhang, R. V. E. Lovelace
This work derives the linearized equations of motion, the Lagrangian density, the Hamiltonian density, and the canonical angular momentum density for general perturbations [$\propt…
Advective Accretion Disks and Related Problems Including Magnetic Fields
G. S. Bisnovatyi-Kogan, R. V. E. Lovelace
Accretion disk theory was first developed as a theory with the local heat balance, where the whole energy produced by a viscous heating was emitted to the sides of the disk. One of…
A Cosmic Battery Reconsidered
G. S. Bisnovatyi-Kogan, R. V. E. Lovelace, V. A. Belinski
We revisit the problem of magnetic field generation in accretion flows onto black holes owing to the excess radiation force on electrons. This excess force may arise from the Poynt…
Magnetic Helix Formation Driven by Keplerian Disk Rotation in an External Plasma Pressure --- The Initial Expansion Stage
H. Li, R. V. E. Lovelace, J. M. Finn +1
We study the evolution of a magnetic arcade that is anchored to an accretion disk and is sheared by the differential rotation of a Keplerian disk. By including an extremely low ext…
Poynting Jets from Accretion Disks
R. V. E. Lovelace, H. Li, G. V. Ustyugova +2
The powerful narrow jets observed to emanate from many compact accreting objects may arise from the twisting of a magnetic field threading a differentially rotating accretion disk…
Asymmetry in Isolated, Morphologically Normal Sa Galaxies
David A. Kornreich, Martha P. Haynes, Katherine P. Jore +1
We have examined the morphological and dynamical HI symmetry properties of a sample of moderately inclined Sa galaxies which are classified as morphologically normal. The sample ga…
Departures From Axisymmetric Morphology and Dynamics in Spiral Galaxies
David A. Kornreich, Martha P. Haynes, R. V. E. Lovelace +1
New HI synthesis data have been obtained for six face-on galaxies with the Very Large Array. These data and reanalyses of three additional data sets make up a sample of nine face-o…
Rossby Wave Instability of Keplerian Accretion Disks
R. V. E. Lovelace, H. Li, S. A. Colgate +1
We find a linear instability of non-axisymmetric Rossby waves in a thin non-magnetized Keplerian disk when there is a local maximum in the radial profile of a key function ${\cal L…
A Photometric Method for Quantifying Asymmetries in Disk Galaxies
David A. Kornreich, Martha P. Haynes, Richard V. E. Lovelace
A photometric method for quantifying deviations from axisymmetry in optical images of disk galaxies is applied to a sample of 32 face-on and nearly face-on spirals. The method invo…
Tilting of a Disk of Gravitating Rings
R. V. E. Lovelace
The present work represents an attempt to understand the `rules of behavior' of observed warps in the HI disks of spiral galaxies found by Briggs (1990). In contrast with most earl…
Two-Stream Instability of Counter-Rotating Galaxies
R. V. E. Lovelace, K. P. Jore, M. P. Haynes
The present study of the two-stream instability in stellar disks with counter-rotating components of stars and/or gas is stimulated by recently discovered counter-rotating spiral a…