Zobrazeno 1 - 10
of 83
pro vyhledávání: '"P. Chris Fragile"'
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 1, p 59 (2023)
We present a set of six general relativistic, multifrequency, radiation magnetohydrodynamic simulations of thin accretion disks with different target mass accretion rates around black holes with spins ranging from nonrotating to rapidly spinning. The
Externí odkaz:
https://doaj.org/article/d025c8a03e6f4d6a9a254d1bc34f3c4a
Autor:
Marek A. Abramowicz, P. Chris Fragile
Publikováno v:
Living Reviews in Relativity, Vol 16, p 1 (2013)
This review covers the main aspects of black hole accretion disk theory. We begin with the view that one of the main goals of the theory is to better understand the nature of black holes themselves. In this light we discuss how accretion disks might
Externí odkaz:
https://doaj.org/article/811073d641e74f1ca3f7ccdc5b78cc10
Autor:
Bridget Ierace, Fabio D. Lora-Clavijo, P. Chris Fragile, Oscar M Pimentel Diaz, Deepika A. Bollimpalli
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 505:4278-4288
The magneto-rotational instability (MRI) is the most likely mechanism for transportation of angular momentum and dissipation of energy within hot, ionized accretion discs. This instability is produced through the interactions of a differentially rota
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 497:1066-1079
We perform detailed variability analysis of two-dimensional viscous, radiation hydrodynamic numerical simulations of Shakura-Sunyaev thin disks around a stellar mass black hole. Disk models are initialized on both the gas-, as well as radiation-, pre
Publikováno v:
Nature Astronomy. 4:541-546
Careful observations of X-ray spectra during type I X-ray bursts have hinted at changes occurring in the inner regions of the accretion disks around the neutron-star component of the binary system. Here, we perform a set of numerical experiments stud
Autor:
P. Chris Fragile
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 491:3245-3250
Across black hole (BH) and neutron star (NS) low-mass X-ray binaries (LMXBs), there appears to be some correlation between certain high- and low-frequency quasi-periodic oscillations (QPOs). In a previous paper, we showed that for BH LMXBs, this coul
Autor:
Bhupendra Mishra, P. Chris Fragile, Jessica Anderson, Aidan Blankenship, Hui Li, Krzysztof Nalewajko
Publikováno v:
The Astrophysical Journal. 939:31
We present a set of three-dimensional, global, general relativistic radiation magnetohydrodynamic simulations of thin, radiation-pressure-dominated accretion disks surrounding a non-rotating, stellar-mass black hole. The simulations are initialized u
Autor:
Peter Anninos, P. Chris Fragile
We report on recent upgrades to our general relativistic radiation-magnetohydrodynamics code, Cosmos++, which expands the two-moment, $\bf{M}_1$, radiation treatment from grey to multi-frequency transport, including Doppler and gravitational frequenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf6667c1d363415352a7f9c4f979697e
We present results from general relativistic calculations of nuclear ignition in white dwarf stars triggered by near encounters with rotating intermediate mass black holes with different spin and alignment parameters. These encounters create thermonu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50f7d9e421cee82a09311ee80633c848
Autor:
Nanda Rea, Gabriele Ponti, Frederick K. Baganoff, Joseph Neilsen, M. Nynka, Sera Markoff, Farhad Yusef-Zadeh, Joern Wilms, Geoffrey C. Bower, Nathalie Degenaar, P. Chris Fragile, Daryl Haggard, Michael A. Nowak, Jason Dexter, Lia Corrales, Mark Morris, Noelia de la Cruz Hernandez, Francesco Coti Zelati, Brayden Mon, Craig O. Heinke
Publikováno v:
Astrophysical Journal, 886(2):96. IOP Publishing Ltd.
We analyze the two brightest Chandra X-ray flares detected from Sagittarius A*, with peak luminosities more than 600 x and 245 x greater than the quiescent X-ray emission. The brightest flare has a distinctive double-peaked morphology --- it lasts 5.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dfcf1c2efb7adf8823a0b4bacb05d7b0