Results 21 to 30 of about 40,120 (302)

The Radiative Transfer in Accretion Discs with Linear Plank Function: Role of Scattering Effect [PDF]

Iranian Journal of Astronomy and Astrophysics, 2020
Radiative transfer in a geometrically thin accretion disc with fnite optical depth is considered under the plane-parallel approximation. The Eddington factor that is defned as the ratio of the mean intensity to radiation stress tensor, is assumed be ...
Fahimeh Habibi, Maryam Samadi
doaj   +1 more source

Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System

Acta Polytechnica CTU Proceedings, 2015
CAL83 is a close binary supersoft X-ray source in the Large Magellanic Cloud. A ~67 s periodicity detected in supersoft X-rays is most probably associated with the spin period of a highly spun-up white dwarf (WD).
A. Odendaal, P. J. Meintjes, P. A. Charles, A. F. Rajoelimanana   +3 more
doaj   +1 more source

Fountain-driven gas accretion by the Milky Way

EPJ Web of Conferences, 2012
Accretion of fresh gas at a rate of ∼ 1M☉yr−1 is necessary in star-forming disc galaxies, such as the Milky Way, in order to sustain their star-formation rates.
Ciotti L., Nipoti C., Binney J., Fraternali F., Marinacci F., Londrillo P.   +5 more
doaj   +1 more source

Quasiperiodic Oscillations and Dynamics of Test Particles around Quasi- and Non-Schwarzschild Black Holes

Universe, 2023
One of the open problems in black hole physics is testing spacetime around black holes through astrophysical observations in the strong field regime. In fact, black holes cannot produce radiation themselves in the electromagnetic spectrum.
Sardor Murodov, Javlon Rayimbaev, Bobomurat Ahmedov, Eldor Karimbaev   +3 more
doaj   +1 more source

Accretion Disc Wind Variability in the States of the Microquasar GRS 1915+105

, 2011
Continuing our study of the role and evolution of accretion disc winds in the microquasar GRS 1915+105, we present high-resolution spectral variability analysis of the beta and gamma states with the Chandra High Energy Transmission Grating Spectrometer ...
Andrew J. Petschek, Begelman, Belloni, Belloni, Blum, Brandt, Canizares, Draine, Ebisawa, Eikenberry, Fender, Fender, Fender, Fender, Frank, Hannikainen, Houck, Houck, Joseph Neilsen, Julia C. Lee, Kallman, Kallman, Klein-Wolt, Kotani, Kotani, Lee, Luketic, Markwardt, Meier, Migliari, Mikles, Miller, Miller, Miller, Miller, Miller, Mirabel, Mirabel, Nayakshin, Neilsen, Neilsen, Ponti, Pooley, Proga, Proga, Reynolds, Rodriguez, Rodriguez, Rothstein, Schulz, Shields, Soleri, Steiner, Tagger, Ueda, Ueda, Ueda, Verner, Wilms, Xiang, Zdziarski, Zimmerman, Życki   +62 more
core   +1 more source

The Accretion Disc Particle Method for Simulations of Black Hole Feeding and Feedback

, 2010
Black holes grow by accreting matter from their surroundings. However, angular momentum provides an efficient natural barrier to accretion and so only the lowest angular momentum material will be available to feed the black holes.
Andrew King, Bate, Bate, Bondi, Bondi, Booth, Bower, Chris Power, Croton, Cuadra, Cuadra, Di Matteo, Fabian, Ferrarese, Frank, Gebhardt, Goodman, Greene, Gültekin, Häring, King, King, King, King, Magorrian, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Paczyński, Paumard, Sazonov, Sazonov, Schartmann, Sergei Nayakshin, Shlosman, Silk, Springel, Springel, Toomre, Tremaine   +41 more
core   +1 more source

The truncated and evolving inner accretion disc of the black hole GX 339-4 [PDF]

, 2014
The nature of accretion onto stellar mass black holes in the low/hard state remains unresolved, with some evidence suggesting that the inner accretion disc is truncated and replaced by a hot flow.
Coriat, M., Fender, R. P., Muñoz-Darias, T., Plant, D. S., Ponti, G.   +4 more
core   +2 more sources

Accretion disc around black hole in Einstein-SU(N) non-linear sigma model

European Physical Journal C: Particles and Fields, 2023
The accretion of matter onto celestial bodies like black holes and neutron stars is a natural phenomenon that releases up to $$40\%$$ 40 % of the matter’s rest-mass energy, which is considered a source of radiation.
G. Abbas, Hamza Rehman, M. Usama, Tao Zhu   +3 more
doaj   +1 more source

Observational Implications of OJ 287’s Predicted 2022 Disk Impact in the Black Hole Binary Model

Galaxies, 2023
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary model because the major axis of the precessing binary happens to lie almost ...
Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar, Staszek Zola, Anne Lähteenmäki, Merja Tornikoski, Alok C. Gupta, Tapio Pursimo, Emil Knudstrup, Jose L. Gomez, Rene Hudec, Martin Jelínek, Jan Štrobl, Andrei V. Berdyugin, Stefano Ciprini, Daniel E. Reichart, Vladimir V. Kouprianov, Katsura Matsumoto, Marek Drozdz, Markus Mugrauer, Alberto Sadun, Michal Zejmo, Aimo Sillanpää, Harry J. Lehto, Kari Nilsson, Ryo Imazawa, Makoto Uemura   +26 more
doaj   +1 more source

Searching for Jet Emission in LMXBs: A Polarimetric View

Galaxies, 2017
We present results taken from a study aiming at detecting the emission from relativistic particles jets in neutron star-low mass X-ray binaries using optical polarimetric observations.
Maria Cristina Baglio, Paolo D’Avanzo, Sergio Campana, Dave M. Russell   +3 more
doaj   +1 more source