Results 81 to 90 of about 40,102 (196)

Accretion Disk Model of Short-Timescale Intermittent Activity in Young Radio Sources

, 2009
We associate the existence of short-lived compact radio sources with the intermittent activity of the central engine caused by a radiation pressure instability within an accretion disk.
Agnieszka Janiuk, Agol, Aneta Siemiginowska, Blundell, Bożena Czerny, Brocksopp, Błażej Nikiel-Wroczyński, Carvalho, Carvalho, Cheung, Clarke, Czerny, Done, Fabian, Fanti, Giroletti, Gopal-Krishna, Grupe, Grupe, Gugliucci, Gugliucci, Hatziminaoglou, Hawley, Hirose, Hopkins, Janiuk, Janiuk, Janiuk, Jeyakumar, Lal, Liu, Meyer, Misra, Morganti, Murgia, Nagai, Nayakshin, Netzer, Osaki, Owsianik, Owsianik, Polatidis, Pringle, Reynolds, Ruszkowski, Saripalli, Shakura, Shakura, Siemiginowska, Siemiginowska, Siemiginowska, Siemiginowska, Sikora, Smak, Spergel, Stawarz, Stawarz, Szuszkiewicz, Taylor, Tengstrand, Tschager, Turner, Vestergaard, Woo, Łukasz Stawarz   +64 more
core   +2 more sources

A multi-wavelength polarimetric study of the blazar CTA 102 during a Gamma-ray flare in 2012

, 2015
We perform a multi-wavelength polarimetric study of the quasar CTA 102 during an extraordinarily bright $\gamma$-ray outburst detected by the {\it Fermi} Large Area Telescope in September-October 2012 when the source reached a flux of F$_{>100~\mathrm ...
Agudo, Iván, Arkharov, Arkady A., Bala, Vishal, Blinov, Dmitry A., Borman, George A., Casadio, Carolina, Di Paola, Andrea, Grishina, Tatiana S., Gurwell, Mark A., Gómez, José L., Hagen-Thorn, Vladimir A., Itoh, Ryosuke, Jorstad, Svetlana G., Joshi, Manasvita, Kopatskaya, Evgenia N., Larionov, Valeri M., Larionova, Elena G., Larionova, Liudmila V., Lähteenmäki, Anne, Marscher, Alan P., Molina, Sol N., Morozova, Daria A., Rastorgueva-Foi, Elizaveta, Sergeev, Sergey G., Smith, Paul S., Taylor, Brian, Thum, Clemens, Tornikoski, Merja, Troitsky, Ivan S., Wiesemeyer, Helmut, Williamson, Karen E.   +30 more
core   +1 more source

A review on coal and gas outburst prediction based on machine learning

Meitan xuebao
The safety in the coal-producing mines in China is continuously improving, but coal and gas outburst accidents still occur. The prediction of coal and gas outbursts allows the scientific application of outburst prevention measures, which can ensure the ...
Sheng XUE, Xiaoliang ZHENG, Liang YUAN, Wenhao LAI, Yuting ZHANG   +4 more
doaj   +1 more source

New insights on accretion in Supergiant Fast X-ray Transients from XMM-Newton and INTEGRAL observations of IGR J17544$-$2619

, 2014
XMM-Newton observations of the supergiant fast X-ray transient IGR$~$J17544$-$2619 are reported and placed in the context of an analysis of archival INTEGRAL/IBIS data that provides a refined estimate of the orbital period at 4.9272$\pm$0.0004 days.
Bazzano, A., Bird, A. J., Drave, S. P., Goossens, M. E., Hill, A. B., Sguera, V., Sidoli, L.   +6 more
core   +1 more source

ABOUT THE PRE-OUTBURST STATE OF THE COAL AND SANDSTONE AND THE POSSIBLE MECHANISM OF COAL AND GAS OUTBURST PROCESS

Мінеральні ресурси України, 2018
The paper aims to examine the suitability of A. S. Balankin brittle fracture criterion in predicting the of large-scale coal and gas outbursts in underground coal mines under compression load. Formation of dissipative structures as cracks and clusters of local microcracking occurs under the influence of the rock pressure.
Yu. I. Voitenko, А. V. Kovtun
openaire   +2 more sources

On Gas Seepage Regularity in Different Structural Bituminous Coal and Its Influence on Outburst-Coal Breaking

Applied Sciences
Coal and gas outburst remains a critical and persistent challenge in coal extraction, posing a profound threat for mine safety. The underlying mechanisms of such disaster, particularly the gas-driven coal fragmentation, continue to elude comprehensive ...
Jie Zheng, Linfan Chen, Gun Huang, Jun Wang, Weile Geng   +4 more
doaj   +1 more source

Quasi-periodic pulse amplitude modulation in the accreting millisecond pulsar IGR J00291+5934

, 2017
We introduce a new method for analysing the aperiodic variability of coherent pulsations in accreting millisecond X-ray pulsars. Our method involves applying a complex frequency correction to the time-domain light curve, allowing for the aperiodic ...
Bult, Peter, van der Klis, Michiel, van Doesburgh, Marieke   +2 more
core   +1 more source

Dissecting accretion and outflows in accreting white dwarf binaries [PDF]

, 2015
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of accreting white dwarfs.
Balman, S., Bernardini, F., Bianchini, A., Bode, M., Bonnet-Bidaud, J. -M., de Martino, D., Falanga, M., Greiner, J., Groot, P., Hernanz, M., Israel, G., Jose, J., Motch, C., Mouchet, M., Norton, A. J., Nucita, A., Orio, M., Osborne, J., Ramsay, G., Rodriguez-Gil, P., Sala, G., Scaringi, S., Schwope, A., Tamburini, F., Traulsen, I.   +24 more
core   +1 more source

An Energetic AGN Outburst Powered by a Rapidly Spinning Supermassive Black Hole or an Accreting Ultramassive Black Hole

, 2009
Powering the 10^62 erg nuclear outburst in the MS0735.6+7421 cluster central galaxy by accretion implies that its supermassive black hole (SMBH) grew by ~6x10^8 solar masses over the past 100 Myr.
Birzan, L., Kazemzadeh, F., Kirkpatrick, C. C., McNamara, B. R., Nulsen, P. E. J., Rafferty, D. A., Wise, M. W.   +6 more
core   +1 more source

The hard quiescent spectrum of the neutron-star X-ray transient EXO 1745-248 in the globular cluster Terzan 5

, 2003
We present a Chandra observation of the globular cluster Terzan 5 during times when the neutron-star X-ray transient EXO 1745-248 located in this cluster was in its quiescent state.
Edmonds, Peter D., Grindlay, Jonathan E., Heinke, Craig O., Jonker, Peter G., Lewin, Walter H. G., Miller, Jon M., Pooley, David, Wijnands, Rudy   +7 more
core   +3 more sources