Results 1 to 10 of about 167,780 (260)

The ngEHT’s Role in Measuring Supermassive Black Hole Spins [PDF]

Galaxies, 2022
While supermassive black-hole masses have been cataloged across cosmic time, only a few dozen of them have robust spin measurements. By extending and improving the existing Event Horizon Telescope (EHT) array, the next-generation Event Horizon Telescope (
Angelo Ricarte, Paul Tiede, Razieh Emami, Aditya Tamar, Priyamvada Natarajan   +4 more
doaj   +2 more sources

The NANOGrav 12.5 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries [PDF]

The Astrophysical Journal Letters, 2023
Pulsar timing array collaborations, such as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), are seeking to detect nanohertz gravitational waves emitted by supermassive black hole binaries formed in the aftermath of galaxy ...
Zaven Arzoumanian, Paul T. Baker, Laura Blecha, Harsha Blumer, Adam Brazier, Paul R. Brook, Sarah Burke-Spolaor, Bence Bécsy, J. Andrew Casey-Clyde, Maria Charisi, Shami Chatterjee, Siyuan Chen, James M. Cordes, Neil J. Cornish, Fronefield Crawford, H. Thankful Cromartie, Megan E. DeCesar, Paul B. Demorest, Timothy Dolch, Brendan Drachler, Justin A. Ellis, E. C. Ferrara, William Fiore, Emmanuel Fonseca, Gabriel E. Freedman, Nathan Garver-Daniels, Peter A. Gentile, Joseph Glaser, Deborah C. Good, Kayhan Gültekin, Jeffrey S. Hazboun, Ross J. Jennings, Aaron D. Johnson, Megan L. Jones, Andrew R. Kaiser, David L. Kaplan, Luke Zoltan Kelley, Joey Shapiro Key, Nima Laal, Michael T. Lam, William G Lamb, T. Joseph W. Lazio, Natalia Lewandowska, Tingting Liu, Duncan R. Lorimer, Jing Luo, Ryan S. Lynch, Dustin R. Madison, Alexander McEwen, Maura A. McLaughlin, Chiara M. F. Mingarelli, Cherry Ng, David J. Nice, Stella Koch Ocker, Ken D. Olum, Timothy T. Pennucci, Nihan S. Pol, Scott M. Ransom, Paul S. Ray, Joseph D. Romano, Brent J. Shapiro-Albert, Xavier Siemens, Joseph Simon, Magdalena Siwek, Renée Spiewak, Ingrid H. Stairs, Daniel R. Stinebring, Kevin Stovall, Joseph K. Swiggum, Jessica Sydnor, Stephen R. Taylor, Jacob E. Turner, Michele Vallisneri, Sarah J. Vigeland, Haley M. Wahl, Gregory Walsh, Caitlin A. Witt, Olivia Young, The NANOGrav Collaboration   +78 more
doaj   +2 more sources

Mass Functions of Supermassive Black Holes across Cosmic Time [PDF]

Advances in Astronomy, 2012
The black hole mass function of supermassive black holes describes the evolution of the distribution of black hole mass. It is one of the primary empirical tools available for mapping the growth of supermassive black holes and for constraining ...
Brandon C. Kelly, Andrea Merloni
doaj   +4 more sources

Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets [PDF]

Galaxies, 2020
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research topic in astrophysics, owing to the fact that many questions remain open on ...
Matteo Cerruti
doaj   +2 more sources

Stellar Collisions in Galactic Nuclei: Impact on Destructive Events Near a Supermassive Black Hole [PDF]

The Astrophysical Journal, 2023
The centers of galaxies host both a supermassive black hole and a dense stellar cluster. Such an environment should lead to stellar collisions, possibly at very high velocities so that the total energy involved is of the same order as supernova ...
Shmuel Balberg, Gilad Yassur
doaj   +2 more sources

The Proper Motion of Sagittarius A*. III. The Case for a Supermassive Black Hole [PDF]

Astrophysical Journal, 2020
We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 yr. The apparent motion of Sgr A* is −6.411 ± 0.008 mas yr−1 along the Galactic plane and −0.219 ± 0.007 mas ...
M. J. Reid, A. Brunthaler, M. J. Reid, A. Brunthaler   +3 more
openalex   +3 more sources

Formation of supermassive black hole seeds [PDF]

Publications Astronomical Society of Australia, 2016
The detection of quasars at $z>6$ unveils the presence of supermassive black holes (BHs) of a few billion solar masses. The rapid formation process of these extreme objects remains a fascinating and open issue.
Ferrara, Andrea, Latif, Muhammad A.
core   +3 more sources

Strong deflection gravitational lensing by a modified Hayward black hole

European Physical Journal C: Particles and Fields, 2017
A modified Hayward black hole is a nonsingular black hole. It is proposed that it would form when the pressure generated by quantum gravity can stop matter’s collapse as the matter reaches the Planck density.
Shan-Shan Zhao, Yi Xie
doaj   +3 more sources

A CEERS Discovery of an Accreting Supermassive Black Hole 570 Myr after the Big Bang: Identifying a Progenitor of Massive z > 6 Quasars [PDF]

Astrophysical Journal Letters, 2023
We report the discovery of an accreting supermassive black hole at z = 8.679. This galaxy, denoted here as CEERS_1019, was previously discovered as a Lyα-break galaxy by Hubble with a Lyα redshift from Keck.
R. Larson, S. Finkelstein, D. Kocevski, T. Hutchison, J. Trump, P. Haro, V. Bromm, N. Cleri, M. Dickinson, S. Fujimoto, J. Kartaltepe, A. Koekemoer, C. Papovich, N. Pirzkal, S. Tacchella, J. Zavala, Micaela B. Bagley, P. Behroozi, J. Champagne, Justin W. Cole, I. Jung, Alexa M. Morales, Guang Yang, Haowen Zhang, A. Zitrin, R. Amor'in, D. Burgarella, C. Casey, 'Oscar A. Ch'avez Ortiz, I. Cox, Katherine Chworowsky, A. Fontana, E. Gawiser, A. Grazian, N. Grogin, S. Harish, N. Hathi, M. Hirschmann, B. Holwerda, S. Juneau, G. Leung, R. Lucas, E. McGrath, P. P'erez-Gonz'alez, J. Rigby, L. Seill'e, R. Simons, B. Weiner, S. Wilkins, L. Y. Aaron Yung, The Ceers Team   +50 more
semanticscholar   +1 more source

The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background [PDF]

Astrophysical Journal Letters, 2023
The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gravitational waves, here we analyze the signal as coming from a population of
G. Agazie, A. Anumarlapudi, A. Archibald, P. Baker, B. B'ecsy, L. Blecha, Alexander Bonilla, A. Brazier, P. Brook, S. Burke-Spolaor, R. Burnette, R. Case, J. Casey-Clyde, M. Charisi, S. Chatterjee, K. Chatziioannou, B. Cheeseboro, Siyuan Chen, T. Cohen, J. Cordes, N. Cornish, F. Crawford, H. Cromartie, K. Crowter, C. Cutler, D. D’Orazio, M. DeCesar, D. DeGan, P. Demorest, Heling Deng, T. Dolch, B. Drachler, E. Ferrara, W. Fiore, E. Fonseca, G. Freedman, E. Gardiner, N. Garver-Daniels, P. Gentile, K. Gersbach, J. Glaser, D. Good, K. Gultekin, J. Hazboun, S. Hourihane, K. Islo, R. Jennings, A. Johnson, Megan L. Jones, A. Kaiser, D. Kaplan, L. Kelley, M. Kerr, J. Key, N. Laal, M. Lam, W. Lamb, T. Lazio, N. Lewandowska, T. Littenberg, Tianyu Liu, Jing Luo, R. Lynch, Chung-Pei Ma, D. Madison, A. McEwen, J. Mckee, M. Mclaughlin, N. McMann, B. Meyers, P. Meyers, C. Mingarelli, A. Mitridate, P. Natarajan, C. Ng, D. Nice, S. Ocker, K. Olum, T. Pennucci, B. Perera, P. Petrov, N. Pol, H. Radovan, S. Ransom, P. Ray, J. Romano, J. Runnoe, S. Sardesai, A. Schmiedekamp, C. Schmiedekamp, K. Schmitz, L. Schult, B. Shapiro-Albert, X. Siemens, J. Simon, M. Siwek, I. Stairs, D. Stinebring, K. Stovall, Jerry P. Sun, A. Susobhanan, J. Swiggum, Jacob M. Taylor, S. Taylor, J. Turner, C. Unal, M. Vallisneri, S. Vigeland, Jeremy M. Wachter, H. Wahl, Qiaohong Wang, C. Witt, David Wright, O. Young   +113 more
semanticscholar   +1 more source