Results 71 to 80 of about 168,088 (243)

Black Holes, Mergers, and the Entropy Budget of the Universe

, 2002
Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the entropy free in the rest of the universe.
Abrahams A M (Binary Black Hole Grand Challenge Alliance Collaboration), Anninos P, Anninos P, Barr S M, Baumgarte T W, Flanagan E E, Holman R, Janka H T, Kamionkowski M, Macchetto E D, Postnov K A, Rees M J, Saijo M, Shibata M, Silk J, Starkman G D, Thomas W Kephart, Tinto M, Totani T, Valageas P, Wilson J R, Y Jack Ng, Yungelson L   +22 more
core   +2 more sources

Spectroscopy of the near-nuclear regions of Cygnus A: estimating the mass of the supermassive black hole [PDF]

, 2003
We use a combination of high spatial resolution optical and near-IR spectroscopic data to make a detailed study of the kinematics of the NLR gas in the near-nuclear regions of the powerful, FRII radio galaxy Cygnus A (z=0.0560), with the overall goal of ...
A. Marconi, Antonucci, Bach, Barth, Barthel, Blanco, Bower, Bruzual, C. Tadhunter, Carilli, Carilli, Conway, Corbett, D. Axon, Djorgovski, Elvis, Faber, Fabian, Ferrarese, Fosbury, Franceschini, Gebhardt, Ghisellini, Jackson, K. Wills, Kaspi, Kellerman, Kormendy, Krichbaum, Maloney, Marconi, Marconi, Marconi, McLean, McLure, McLure, N. Jackson, Ogle, Osterbrock, Owen, Reynolds, Silk, Simkin, Sorathia, Spinrad, Stockton, T. G. Robinson, Tadhunter, Tadhunter, Tadhunter, Tadhunter, Tadhunter, Taylor, Thornton, Tremaine, Ueno, van der Marel, Verdoes Kleijn, Verdoes Kleijn, Ward, Young   +60 more
core   +3 more sources

Supermassive Black Holes [PDF]

Journal of High Energy Physics, Gravitation and Cosmology, 2019
In the following black hole model, electrons and positrons form a neutral gas which is confined by gravitation. The smaller masses are supported against gravity by electron degeneracy pressure. Larger masses are supported by ideal gas and radiation pressure. In each case, the gas is a polytrope which satisfies the Lane-Emden equation.
openaire   +2 more sources

Cold, clumpy accretion onto an active supermassive black hole [PDF]

Nature, 2016
The so-called accretion flow that powers the growth of supermassive black holes in galaxy centres is assumed to be dominated by a smooth, steady flow of very hot plasma, but now observations instead reveal a clumpy accretion of very cold molecular clouds
Grant R. Tremblay, Grant R. Tremblay, J. Oonk, J. Oonk, F. Combes, P. Salomé, C. O’Dea, C. O’Dea, S. Baum, S. Baum, G. Voit, M. Donahue, B. McNamara, T. A. Davis, T. A. Davis, Michael McDonald, A. Edge, T. Clarke, Roberto Galván-Madrid, Roberto Galván-Madrid, M. Bremer, L. O. V. Edwards, A. C. Fabian, S. Hamer, Yuan Li, A. Maury, H. Russell, A. Quillen, C. Urry, J. Sanders, M. Wise   +30 more
semanticscholar   +1 more source

Circumbinary discs from tidal disruption events

, 2017
Tidal disruption events, which occur when a star is shredded by the tidal field of a supermassive black hole, provide a means of fueling black hole accretion. Here we show, using a combination of three body orbit integrations and hydrodynamic simulations,
Armitage, Philip J., Coughlin, Eric R.
core   +1 more source

Supermassive black holes in galactic bulges [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2008
Abstract Growing evidence indicate supermassive black holes (SMBHs) in a mass range of MBH∼ 106–1010 M⊙ lurking in central stellar bulges of galaxies. Extensive observations reveal fairly tight power laws of MBH versus the mean stellar velocity dispersion σ of the host stellar bulge.
Lou, Yu-Qing, Jiang, Yan-Fei
openaire   +2 more sources

The persistent shadow of the supermassive black hole of M 87

Astronomy & Astrophysics
In April 2019, the Event Horizon Telescope (EHT) Collaboration reported the first-ever event-horizon-scale images of a black hole, resolving the central compact radio source in the giant elliptical galaxy M 87. These images reveal a ring with a southerly
K. Akiyama, A. Alberdi, W. Alef, J. Algaba, R. Anantua, K. Asada, R. Azulay, U. Bach, A. Baczko, D. Ball, M. Baloković, B. Bandyopadhyay, J. Barrett, M. Bauböck, B. Benson, D. Bintley, L. Blackburn, R. Blundell, K. Bouman, G. Bower, H. Boyce, M. Bremer, R. Brissenden, S. Britzen, A. Broderick, D. Broguiere, T. Bronzwaer, S. Bustamante, J. Carlstrom, A. Chael, Chi-kwan Chan, Dominic O. Chang, K. Chatterjee, S. Chatterjee, Ming-Tang Chen, Yongjun Chen, Xiaopeng Cheng, I. Cho, P. Christian, N. S. Conroy, J. Conway, T. Crawford, G. Crew, A. Cruz-Osorio, Yuzhu Cui, R. Dahale, J. Davelaar, M. De Laurentis, R. Deane, J. Dempsey, G. Desvignes, J. Dexter, V. Dhruv, I. K. Dihingia, S. Doeleman, S. Dzib, R. Eatough, R. Emami, H. Falcke, J. Farah, V. Fish, E. Fomalont, H. Ford, M. Foschi, R. Fraga-Encinas, W. Freeman, P. Friberg, C. Fromm, A. Fuentes, P. Galison, C. Gammie, Roberto García, O. Gentaz, B. Georgiev, C. Goddi, R. Gold, A. I. Gómez-Ruiz, J. Gómez, Minfeng Gu, M. Gurwell, K. Hada, D. Haggard, R. Hesper, D. Heumann, L. C. Ho, P. Ho, M. Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, C. M. Violette Impellizzeri, Makoto Inoue, S. Issaoun, D. J. James, B. Jannuzi, M. Janssen, B. Jeter, Wu Jiang, A. Jiménez-Rosales, Michael D. Johnson, S. Jorstad, A. C. Jones, A. Joshi, T. Jung, R. Karuppusamy, T. Kawashima, G. Keating, M. Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, M. Kino, J. Koay, Prashant Kocherlakota, Y. Kofuji, P. M. Koch, S. Koyama, C. Kramer, J. Kramer, M. Kramer, T. Krichbaum, C. Kuo, N. La Bella, Sang-Sung Lee, A. Levis, Zhiyuan Li, R. Lico, Greg Lindahl, M. Lindqvist, M. Lisakov, Jun Liu, Kuo Liu, E. Liuzzo, Wen-Ping Lo, A. Lobanov, L. Loinard, C. Lonsdale, A. Lowitz, Ruohan Lu, N. MacDonald, J. Mao, N. Marchili, S. Markoff, D. Marrone, A. Marscher, I. Martí-Vidal, S. Matsushita, L. Matthews, L. Medeiros, K. Menten, I. Mizuno, Y. Mizuno, J. Montgomery, J. M. Moran, K. Moriyama, M. Mościbrodzka, W. Mulaudzi, C. Müller, H. Müller, A. Mus, G. Musoke, I. Myserlis, H. Nagai, N. Nagar, M. Nakamura, G. Narayanan, I. Natarajan, A. Nathanail, S. N. Fuentes, J. Neilsen, C. Ni, M. Nowak, Junghwan Oh, H. Okino, H. Olivares, T. Oyama, F. Özel, D. Palumbo, G. Paraschos, Jongho Park, H. Parsons, N. Patel, U. Pen, D. Pesce, V. Piétu, A. PopStefanija, O. Porth, B. Prather, D. Psaltis, Hung-Yi Pu, V. Ramakrishnan, R. Rao, M. Rawlings, A. Raymond, L. Rezzolla, A. Ricarte, B. Ripperda, F. Roelofs, C. Romero-Cañizales, E. Ros, A. Roshanineshat, H. Rottmann, A. Roy, I. Ruiz, C. Ruszczyk, K. Rygl, S. Sánchez, D. Sánchez-Argüelles, M. Sánchez-Portal, M. Sasada, K. Satapathy, T. Savolainen, F. Schloerb, J. Schonfeld, K. Schuster, Lijing Shao, Z. Shen, D. Small, B. Sohn, J. SooHoo, L. Salas, K. Souccar, J. S. Stanway, He Sun, F. Tazaki, A. Tetarenko, P. Tiede, R. Tilanus, M. Titus, K. Toma, P. Torne, T. Toscano, E. Traianou, T. Trent, S. Trippe, M. Turk, I. van Bemmel, H. V. van Langevelde, D. V. van Rossum, J. Vos, J. Wagner, D. Ward-Thompson, J. Wardle, J. Washington, J. Weintroub, R. Wharton, M. Wielgus, K. Wiik, G. Witzel, M. Wondrak, G. Wong, Qingwen Wu, N. Yadlapalli, P. Yamaguchi, A. Yfantis, D. Yoon, A. Young, Z. Younsi, Wei Yu, F. Yuan, Ye-Fei Yuan, J. Anton Zensus, Shuo Zhang, Guangyao Zhao, Shan-Shan Zhao, Alexander Allardi, Shu-Hao Chang, Chih-Cheng Chang, Song-Chu Chang, Chung-Chen Chen, R. Chilson, A. Faber, David M. Gale, C. Han, Kuo-Chang Han, Y. Hasegawa, J. L. Hernandez-Rebollar, Yau-De Huang, Homin Jiang, Jinchi Hao, K. Kimura, D. Kubo, Chao-Te Li, L. Lin, C. Liu, Kuan-Yu Liu, Li‐Ming Lu, P. Martin-Cocher, Z. Meyer-Zhao, A. Montaña, A. Moraghan, Marcos Emir Moreno-Nolasco, H. Nishioka, T. Norton, G. Nystrom, Hideo Ogawa, P. Oshiro, N. Pradel, G. Principe, P. Raffin, I. Rodríguez-Montoya, P. Shaw, William Snow, Sridharan T. K., R. Srinivasan, T. Wei, Chen-Yu Yu   +308 more
semanticscholar   +1 more source

Do Moderate-Luminosity Active Galactic Nuclei Suppress Star Formation? [PDF]

, 2009
The growth of supermassive black holes and their host galaxies are thought to be linked, but the precise nature of this symbiotic relationship is still poorly understood. Both observations and simulations of galaxy formation suggest that the energy input
Adelman-McCarthy, Anderson, Antonucci, Bronika Kushkuley, Brooke Simmons, Bundy, C. Megan Urry, Conselice, Constantin, Ezequiel Treister, Ferrarese, Gebhardt, Gehrels, Hopkins, Häring, Johansson, Kaviraj, Kaviraj, Kevin Schawinski, Li, Martini, Martini, Nandra, Peng, Salim, Schawinski, Schawinski, Shanil Virani, Silverman, Simmons, Sugata Kaviraj, Treister, Tueller, Voges, Wild, Yi, York   +36 more
core   +4 more sources

A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates [PDF]

, 2016
Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circum-binary discs predict strong periodic modulation of the mass accretion ...
M. Charisi, I. Bartos, Z. Haiman, A. Price-Whelan, M. Graham, E. Bellm, R. Laher, S. Márka   +7 more
semanticscholar   +1 more source

Supermassive black hole ancestors

, 2012
We study a model in which supermassive black holes (SMBHs) can grow by the combined action of gas accretion on heavy seeds and mergers of both heavy (m_s^h=10^5 Msol) and light (m_s^l = 10^2 Msol) seeds.
A. Ferrara, A. Petri, Abel, Abel, Alvarez, Baker, Begelman, Bromm, Bromm, Brusa, Ciardi, Dopcke, Fan, Fan, Fan, Fiore, Greif, Häring, Kuhlen, Lacey, Larson, Leitherer, Lodato, Loeb, Mapelli, Marconi, Marconi, Milosavljević, Mo, Mortlock, Natarajan, Nixon, Oh, Omukai, Omukai, Omukai, Parkinson, Preto, R. Salvaterra, Regan, Ricotti, Schneider, Sesana, Spaans, Springel, Tanaka, Valdés, Valiante, Volonteri, Volonteri, Vázquez, Warren, Willott, Willott, Willott, Wolcott-Green, Yoshida   +56 more
core   +1 more source