Results 101 to 110 of about 32,039 (196)

No Supermassive Black Hole in M33?

Science, 2001
We observed the nucleus of M33, the third-brightest galaxy in the Local Group, with the Space Telescope Imaging Spectrograph at a resolution at least a factor of 10 higher than previously obtained. Rather than the steep rise expected within the radius of gravitational influence of a supermassive black hole, the random stellar velocities showed a ...
Merritt, David, Ferrarese, Laura, Joseph, Charles L.   +2 more
openaire   +3 more sources

Tidal disruption flares from stars on eccentric orbits

EPJ Web of Conferences, 2012
We study tidal disruption and subsequent mass fallback for stars approaching supermassive black holes on bound orbits, by performing three dimensional Smoothed Particle Hydrodynamics simulations with a pseudo-Newtonian potential.
Loeb A., Stone N., Hayasaki K.
doaj   +1 more source

Supermassive black holes at high redshifts [PDF]

, 2019
MeV blazars are the most luminous persistent sources in the Universe and emit most of their energy in the MeV band. These objects display very large jet powers and accretion luminosities and are known to host black holes with a mass often exceeding $10^9
Agudo, Ivan, Ajello, Marco, Baring, Matthew, Beckmann, Volker, Bozhilov, Vladimir, Buson, Sara, Castro, Daniel, Coppi, Paolo, D'Ammando, Filippo, De Angelis, Alessandro, Dominguez, Alberto, Doro, Michele, Gasparrini, Dario, Guiriec, Sylvain, Guiriec, Sylvain, Harding, J. Patrick, Hartmann, Dieter, Hays, Elizabeth, Hewitt, John W., Li, Hui, Longo, Francesco, Marcotulli, Lea, Marcowith, Alexandre, McEnery, Julie, Ojha, Roopesh, Orlando, Elena, Paliya, Vaidehi S., Perkins, Jeremy S., Petropoulou, Maria, Prandini, Elisa, The, Lih-Sin, Thompson, David, Tomsick, John, Venters, Tonia, Wadiasingh, Zorawar   +34 more
core   +1 more source

A Comparison of the X-Ray Polarimetric Properties of Stellar and Supermassive Black Holes

The Astrophysical Journal
X-ray polarization provides a new way to probe accretion geometry in black hole systems. If the accretion geometry of black holes is similar regardless of mass, we should expect the same to be true of their polarization properties.
M. Lynne Saade, Philip Kaaret, Ioannis Liodakis, Steven R. Ehlert   +3 more
doaj   +1 more source

Observational Constraints on the Self Interacting Dark Matter Scenario and the Growth of Supermassive Black Holes

, 2001
We consider the consequences of SIDM for a velocity dependent cross section per unit mass. Accretion of SIDM onto seed black holes can produce supermassive black holes that are too large for certain combinations of parameters,which is used to obtain a ...
Dalcanton J. J., de Blok W. J. G., Lacey C., Lynden-Bell D., Padmanabhan T., Persic M., Richstone D., Zhao H. S.   +7 more
core   +1 more source

Supermassive black holes then and now [PDF]

AIP Conference Proceedings, 1998
7 pages, to appear in The Proceedings of the Second International LISA Symposium on Graviational Waves, ed.
openaire   +3 more sources

Bayesian Black Hole Photogrammetry

The Astrophysical Journal
We propose an analytic dual-cone accretion model for horizon-scale images of the cores of low-luminosity active galactic nuclei, including those observed by the Event Horizon Telescope (EHT).
Dominic O. Chang, Michael D. Johnson, Paul Tiede, Daniel C. M. Palumbo   +3 more
doaj   +1 more source

Supermassive black holes from primordial black hole seeds [PDF]

Physical Review D, 2004
The observational evidence for a population of quasars powered by supermassive black holes of mass \geq 10^9 M_sun at redshifts z\geq 6 poses a great challenge for any model describing the formation of galaxies. Assuming uninterrupted accretion at the Eddington limit, seed black holes of at least 1000 M_sun are needed at z \approx 15.
openaire   +2 more sources

A population of luminous accreting black holes with hidden mergers

, 2018
Major galaxy mergers are thought to play an important part in fuelling the growth of supermassive black holes. However, observational support for this hypothesis is mixed, with some studies showing a correlation between merging galaxies and luminous ...
A DasGupta, A Sesana, AD Goulding, AK Weigel, Anna Weigel, B Groves, Benny Trakhtenbrot, C Leitherer, C Ricci, C Ricci, C Villforth, C-L Hung, Chao-Ling Hung, Claudio Ricci, D Kocevski, D Narayanan, D Patton, David B. Sanders, E Bertin, E Glikman, E Massaro, Ezequiel Treister, G Kauffmann, G Vaucouleurs de, GF Snyder, H Fu, J Brinchmann, J Kormendy, Jessica R. Lu, JL Donley, JPW Verbiest, Kevin Schawinski, KN Abazajian, L Blecha, L Mayer, Laura Blecha, Lia F. Sartori, LK Hunt, M Barden, M Koss, M Koss, M Koss, Michael J. Koss, MP Véron-Cetty, MR Blanton, MR Blanton, NA Grogin, P Jonsson, P Jonsson, PF Hopkins, PF Hopkins, Phillip Bernhard, PR Capelo, R Chary, R Narayan, RI Davies, Richard Mushotzky, RN Lang, RS Barrows, S Haan, S Wassenhove Van, Sylvain Veilleux, T Matteo Di, U Vivian, V Springel, V Springel, WH Baumgartner, Y Ohyama, Y Tang, Y-Y Chang   +69 more
core   +1 more source

87th Annual Meeting of the Meteoritical Society 2025: Abstracts

Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley   +1 more source