Zobrazeno 1 - 10 of 111 pro vyhledávání: '"Robert V. Wagoner"'
1
Evolution of a Mode of Oscillation Within Turbulent Accretion Disks
Autor: Celia R. Tandon, Robert V. Wagoner
We investigate the effects of subsonic turbulence on a normal mode of oscillation [a possible origin of the high-frequency quasi-periodic oscillations (HFQPOs) within some black hole accretion disks]. We consider perturbations of a time-dependent bac
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a26738c5794bb6838da0991ab584e2f7
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2
Why Have the Observed High-frequency QPOs Not Been Produced by (MHD) Computer Simulations of Black Hole Accretion Disks?
Autor: Celia R. Tandon, Robert V. Wagoner
Publikováno v: Research Notes of the AAS. 5:274
We compare some predictions of Wagoner & Tandon (2021) with the results of the hydrodynamic and magnetohydrodynamic (MHD) simulations of Reynolds & Miller (2009). It appears that the MHD simulations were not run for long enough and the numerical damp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60c5a18f64e768c1e9f9c1a1fb8fd222
https://doi.org/10.3847/2515-5172/ac3d94
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3
Confrontation of Observation and Theory: High-frequency QPOs in X-Ray Binaries, Tidal Disruption Events, and Active Galactic Nuclei
Autor: Celia R. Tandon, Krista Lynne Smith, Robert V. Wagoner
Publikováno v: The Astrophysical Journal. 906:92
We compile observations of high-frequency quasi-periodic oscillations (QPOs) around black holes, both stellar and supermassive, and compare their positions in the parameter space of black hole mass, spin, and oscillation frequency. We find that super
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::726349fe04ba54f95c0e11c2ef53ed4e
https://doi.org/10.3847/1538-4357/abc9b7
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4
Evidence for an Optical Low-frequency Quasi-Periodic Oscillation in the Kepler Light Curve of an Active Galaxy
Autor: Robert V. Wagoner, Patricia T. Boyd, Krista Lynne Smith, Richard F. Mushotzky
We report evidence for a quasi-periodic oscillation (QPO) in the optical light curve of KIC 9650712, a narrow-line Seyfert 1 galaxy in the original Kepler field. After the development and application of a pipeline for Kepler data specific to active g
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5
Order out of Randomness: Self-Organization Processes in Astrophysics
Autor: Mark C. M. Cheung, Markus J. Aschwanden, Juergen Kurths, D. Mueller, Jeffrey D. Scargle, W. H. Green, Alexei G. Kritsuk, William Béthune, Arnold O. Benz, Werner Schmutz, Felix Scholkmann, Andrew Melatos, Guennadi Chernov, V. I. Abramenko, Virginia Trimble, Robert V. Wagoner
Publikováno v: Space Science Reviews, 214
Aschwanden, Markus J; Scholkmann, Felix; Béthune, William; Schmutz, Werner; Abramenko, Valentina; Cheung, Mark CM; et al.(2018). Order out of Randomness: Self-Organization Processes in Astrophysics. Space Science Reviews, 214(2). doi: 10.1007/s11214-018-0489-2. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/4tf8h889
Web of Science
Self-organization is a property of dissipative nonlinear processes that are governed by a global driving force and a local positive feedback mechanism, which creates regular geometric and/or temporal patterns, and decreases the entropy locally, in co
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7
Relativistic and Newtonian diskoseismology
Autor: Robert V. Wagoner
Publikováno v: New Astronomy Reviews. 51:828-834
The normal mode oscillations of thin accretion disks around black holes and other compact objects are analyzed and contrasted with those in stars. For black holes, the most robust modes are gravitationally trapped near the radius at which the radial
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::af67d770df2266cf035f636e27e3ddf7
https://doi.org/10.1016/j.newar.2008.03.012
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8
Normal modes of black hole accretion disks
Autor: Manuel Ortega-Rodríguez, Alexander S. Silbergleit, Robert V. Wagoner
Publikováno v: Geophysical & Astrophysical Fluid Dynamics. 102:75-115
This paper studies the hydrodynamical problem of normal modes of small adiabatic oscillations of relativistic barotropic thin accretion disks around black holes (and compact weakly magnetic neutron stars). Employing WKB techniques, we obtain the eige
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5f54f36c70d01757f5e0a84bd8c6c3e
https://doi.org/10.1080/03091920701462130
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10
Do Magnetic Fields Destroy Black Hole Accretion Disk g-Modes?
Autor: Adam Levine, Hugo Solís-Sánchez, Manuel Ortega-Rodríguez, J. Agustín Arguedas-Leiva, Robert V. Wagoner
Publikováno v: The Astrophysical Journal, vol. 809(15), pp. 1-6
Kérwá
Universidad de Costa Rica
instacron:UCR
Diskoseismology, the theoretical study of normal mode oscillations in geometrically thin, optically thick accretion disks, is a strong candidate to explain some QPOs in the power spectra of many black hole X-ray binary systems. The existence of g-mod
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a374c1fea948db0526ad0f33762a2a53
https://iopscience.iop.org/article/10.1088/0004-637X/809/1/15/meta
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