Results 1 to 10 of about 40,120 (302)

Long-term evolution of accretion discs in Be/X-ray binaries [PDF]

, 2006
We numerically study the long-term evolution of the accretion disc around the neutron star in a coplanar Be/X-ray binary with a short period and a moderate eccentricity. From three dimensional Smoothed Particle Hydrodynamics simulations, we find that the
Hayasaki, K., Okazaki, Atsuo T.
core   +5 more sources

Potential impact of the Sagittarius dwarf galaxy on the formation of young O-rich stars [PDF]

Nature Communications
The Milky Way underwent significant transformations in its early history, characterised by violent mergers and satellite galaxy accretion. However, recent observations reveal notable star formation events over the past 4 Gyr, likely triggered by ...
Tiancheng Sun, Shaolan Bi, Xunzhou Chen, Yuqin Chen, Yuxi Lucy Lu, Chao Liu, Tobias Buck, Xianfei Zhang, Tanda Li, Yaguang Li, Yaqian Wu, Zhishuai Ge, Lifei Ye   +12 more
doaj   +2 more sources

Low strength and a shared size distribution connect the hot and cold Kuiper belt populations [PDF]

Nature Communications
Understanding how the observed size distribution of Kuiper Belt objects emerged from the primordial planetesimal population remains a major challenge in planetary science.
P. G. Benavidez, A. Campo Bagatin, V. Serra Cardoso, T. Santana-Ros   +3 more
doaj   +2 more sources

The gravitational microlens influence on X-ray spectral line generated by an AGN accretion disc [PDF]

Serbian Astronomical Journal, 2001
The influence of gravitational microlensing on the X-ray spectral line profiles originated from a relativistic accretion disc has been studied. Using a disc model, we show that microlensing can induce noticeable changes in the line shapes when the ...
Popović L.Č., Mediavilla E.G., Munoz J.A., Dimitrijević M.S., Jovanović P.   +4 more
doaj   +1 more source

Intensity and Polarization of Radiation Emerging from Rotating Accretion Disc with Increasing Height

Universe, 2020
We consider the radiation emission in continuum and spectral lines from rotating accretion disc with the progressive increasing height. It is known that for the plane accretion disc with homogeneous atmosphere the wave electric field E is perpendicular ...
Nikolai Silant’ev, Galina Alekseeva, Yulia Ananjevskaja, Viktor Novikov   +3 more
doaj   +1 more source

ACCRETION DISCS AROUND BLACK HOLES: DEVELOPEMENT OF THEORY

Odessa Astronomical Publications, 2017
Standard accretion disk theory is formulated which is based on the local heat balance. The energy produced by a turbulent viscous heating is supposed to be emitted to the sides of the disc.
G. S. Bisnovatyi-Kogan
doaj   +1 more source

Phase-resolved optical and X-ray spectroscopy of low-mass X-ray binary X1822-371 [PDF]

, 2012
(Abridged) X1822-371 is the prototypical accretion disc corona X-ray source, a low-mass X-ray binary viewed at very high inclination, thereby allowing the disc structure and extended disc coronal regions to be visible.
A. Somero, Appenzeller, Armitage, Baptista, Bayless, Burderi, Casares, Cowley, den Herder, Griffiths, Hakala, Hakala, Harlaftis, Heinz, Hellier, Hellier, Hutchings, Iaria, Ji, Jimenez-Garate, Jonker, Marsh, Mason, Mason, Muñoz-Darias, O. Vilhu, P. Charles, P. Hakala, P. Muhli, Parmar, Porquet, Puchnarewicz, Schandl, Schneider, Shafter, Steeghs, Steeghs, Strüder, White   +38 more
core   +3 more sources

THREE-DIMENSIONAL NUMERICAL HYDRODYNAMICAL SIMULATION OF LOW/HARD AND HIGH/SOFT STATES IN ACCRETION DISCS OF MICROQUASARS AND QUASARS ON BASE OF UNDEFINED PRECESSION

Odessa Astronomical Publications, 2016
In this study, the models of slaved precession of accretion disc and donors radiationdriven wind were performed using three-dimensional numerical astrophysical methods by the example of microquasar Cyg X-1. As is shown, in the course of precession of the
V. V. Nazarenko, S. V. Nazarenko
doaj   +1 more source

Accretion Disc Thermal Reverberation in the Lamp Post Geometry

Proceedings, 2019
We present results regarding the disc response functions and the corresponding time lags assuming a standard Novikov--Thorne accretion disc illuminated by a point-like X-ray source.
Iossif E. Papadakis, Elias S. Kammoun, Michal Dovciak   +2 more
doaj   +1 more source

Accretion Disc Theory: From the Standard Model Until Advection [PDF]

, 1998
Accretion disc 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 disc.
AC Fabian, AM Cherepashchuk, B Paczynsci, B Paczynsci, BA Trubnikov, D Lynden-Bell, EP Velikhov, EPT Liang, G Gamov, GS Bisnovatyi-Kogan, GS Bisnovatyi-Kogan, GS Bisnovatyi-Kogan, GS Bisnovatyi-Kogan, GS Bisnovatyi-Kogan, GS Bisnovatyi-Kogan, H Bondi, H Bondi, H Riffert, ID Novikov, IV Artemova, JE Pringle, L Spitzer, LD Landau, M Schmidt, MA Abramovicz, NI Shakura, R Matsumoto, R Narayan, R. Hö, S Tsuneta, SA Balbus, SK Chakrabarti, SK Chakrabarti, SL Shapiro, VF Schwartsman, W Chen   +35 more
core   +3 more sources