Results 141 to 150 of about 189,148 (351)

Optical Monitoring of PKS 1510-089: A Binary Black Hole System?

, 2005
Three deep flux minima were observed with nearly the same time-scales and intervals for the blazar PKS 1510-089 in the past few years. A binary black hole system was proposed to be at the nucleus of this object, and a new minimum was predicted to occur ...
B. Peng, Begelman, Cao, Caproni, Caproni, Conway, Dai, Fan, Fan, Fey, Gómez, Gómez, Hayashida, Homan, Homan, J. Chen, J. Ma, J. Wu, Jorstad, Kellermann, Komossa, Liu, O'Dea, Oke, Ostorero, Peng, Pursimo, Raiteri, Roos, Sillanpää, Sillanpää, Stetson, Tateyama, Tingay, Valtaoja, Vicente, Villata, Villata, Villata, Webb, Webb, Wu, X. Zhou, Xie, Xie, Xie, Xu, Z. Jiang, Zensus, Zhou   +49 more
core   +1 more source

Shadows of exact binary black holes

Physical Review D, 2018
Black hole (BH) shadows in dynamical binary BHs (BBHs) have been produced via ray-tracing techniques on top of expensive fully non-linear numerical relativity simulations. We show that the main features of these shadows are captured by a simple quasi-static resolution of the photon orbits on top of the static double-Schwarzschild family of solutions ...
Cunha, Pedro V. P., Herdeiro, Carlos A. R., Rodriguez, Maria J.   +2 more
openaire   +5 more sources

High‐Performance and Energy‐Efficient Sub‐5 nm 2D Double‐Gate MOSFETs Based on Silicon Arsenide Monolayers

Advanced Electronic Materials, EarlyView.
Sub‐5 nm double‐gate MOSFETs based on 2D SiAs monolayers are investigated using quantum transport simulations. By engineering source‐drain underlap regions, the devices achieve exceptional on‐currents of up to 1206 µA µm−1, surpassing the ITRS 2028 high‐performance targets.
Dogukan Hazar Ozbey, Engin Durgun
wiley   +1 more source

Black Hole Accretion and Spin-up through Stellar Collisions in Dense Star Clusters

The Astrophysical Journal
Dynamical interactions in dense star clusters could significantly influence the properties of black holes, leaving imprints on their gravitational-wave signatures.
Fulya Kıroğlu, Kyle Kremer, Sylvia Biscoveanu, Elena González Prieto, Frederic A. Rasio   +4 more
doaj   +1 more source

Black Hole Accretion in Gamma Ray Bursts

Galaxies, 2017
We study the structure and evolution of the hyperaccreting disks and outflows in the gamma ray bursts central engines. The torus around a stellar mass black hole is composed of free nucleons, Helium, electron-positron pairs, and is cooled by neutrino ...
Agnieszka Janiuk, Michal Bejger, Petra Sukova, Szymon Charzynski   +3 more
doaj   +1 more source

Precursor flares in OJ 287

, 2012
We have studied three most recent precursor flares in the light curve of the blazar OJ 287 while invoking the presence of a precessing binary black hole in the system to explain the nature of these flares.
Baliyan, K. S., Berdyugin, A., Chandra, S., Coggins-Hill, S. A., Drozdz, M., Ganesh, S., Gopakumar, A., Koziel-Wierzbowska, D., Liakos, A., Lindfors, E., Nilsson, K., Ogloza, W., Pihajoki, P., Provencal, J., Reinthal, R., Salo, H., Santangelo, M. M. M., Sillanpää, A., Takalo, L., Valtonen, M., Winiarski, M., Zola, S.   +21 more
core   +1 more source

Toward Complete CO2 Electroconversion: Status, Challenges, and Perspectives

Advanced Energy Materials, EarlyView.
Electrocatalytic CO2 reduction and CO2 batteries face challenges in achieving complete CO2 conversion with high conversion rates and Faradaic efficiency simultaneously. Existing systems compromise one for the other with incomplete CO2 conversion and inefficiencies, hindering practical applications. This perspective highlights state‐of‐the‐art progress,
Changfan Xu, Ping Hong, Yulian Dong, Marc Robert, Guosheng Shao, Yong Lei   +5 more
wiley   +1 more source

Counting Black Holes: The Cosmic Stellar Remnant Population and Implications for LIGO

, 2017
We present an empirical approach for interpreting gravitational wave signals of binary black hole mergers under the assumption that the underlying black hole population is sourced by remnants of stellar evolution.
Bullock, James S., Elbert, Oliver D., Kaplinghat, Manoj   +2 more
core   +1 more source

Device Performance of Emerging Photovoltaic Materials (Version 6)

Advanced Energy Materials, EarlyView.
Efficiency of single junction perovskite (circles), organic (hexagons), dye sensitized (pentagons), kesterite (diamonds), Sb2Se3 (right triangle), and AgBiS2 (left triangles) solar cells at emerging‐pv.org over the last decade. ABSTRACT This 6th annual Emerging PV Report surveys peer‐reviewed advances since August 2024 across perovskite, organic ...
Osbel Almora, Agustin O. Alvarez, Derya Baran, Carlos I. Cabrera, Luigi A. Castriotta, Bruno Ehrler, Sule Erten‐Ela, Kenjiro Fukuda, Fei Guo, Jens Hauch, Anita W.Y. Ho‐Baillie, T. Jesper Jacobsson, Rene A. J. Janssen, Thomas Kirchartz, Maria A. Loi, Richard R. Lunt, Xavier Mathew, Jie Min, David B. Mitzi, Mohammad K. Nazeeruddin, Ana F. Nogueira, Ulrich W. Paetzold, Nam‐Gyu Park, Barry P. Rand, Henry Snaith, Takao Someya, Christian Sprau, Lulu Sun, Karen Forberich, Christoph J. Brabec   +29 more
wiley   +1 more source

Survival Probability for a Hypervelocity Star in Close Neighborhood of a Supermassive Black Hole

Open Astronomy, 2015
We present the results of numerical simulation on the probability of formation of a Hypervelocity Star (HVS) in the scenario of dynamic capture of a close binary system by the central black hole in the Galaxy and on the probability of its survival in the
Dryomova G., Dryomov V., Tutukov A.
doaj   +1 more source