Results 71 to 80 of about 34,507 (229)

Supermassive black holes in galactic nuclei

AIP Conference Proceedings, 2001
We review the motivation and search for supermassive black holes (BHs) in galaxies. Energetic nuclear activity provides indirect but compelling evidence for BH engines. Ground-based dynamical searches for central dark objects are reviewed in Kormendy & Richstone (1995, ARA&A, 33, 581). Here we provide an update of results from the HST.
John Kormendy, Karl Gebhardt
openaire   +3 more sources

Why are AGN found in High Mass Galaxies?

, 2008
We use semi-analytic models implemented in the Millennium Simulation to analyze the merging histories of dark matter haloes and of the galaxies that reside in them.
Barger, Bower, Boylan-Kolchin, Colless, Croton, De Lucia, De Lucia, De Lucia, Duschl, Ferrarese, Gebhardt, Guinevere Kauffmann, Haehnelt, Hasan, Hasinger, Heckman, Ho, Hopkins, Hopkins, Hopkins, Jiang, Kang, Kauffmann, Kauffmann, Kormendy, Lan Wang, Li, Magorrian, McCarthy, Merloni, Mihos, Richards, Spergel, Springel, Springel, Steffen, Volonteri, Wang, Weinmann, Wyithe, Zheng   +40 more
core   +1 more source

Nuclear Spirals and Supermassive Black Holes [PDF]

Symposium - International Astronomical Union, 2004
We have performed SPH simulations for the response of the gaseous disks to the imposed potentials including those from bars and SMBHs. Evolution of the nuclear regions of gaseous disks depends critically on the masses of SMBHs as well as the sound speed in the gas.
Hong Bae Ann, Parijat Thakur
openaire   +3 more sources

Rotating scalarized supermassive black holes

European Physical Journal C: Particles and Fields
In this study, we investigate rotating black hole solutions within a scalar-Gauss–Bonnet gravity framework that incorporates a squared Gauss–Bonnet term. By employing a quadratic–exponential coupling function between the scalar field and the Gauss–Bonnet
Shoupan Liu, Yunqi Liu, Yan Peng, Cheng-Yong Zhang   +3 more
doaj   +1 more source

Measuring spin of a supermassive black hole at the Galactic centre -- Implications for a unique spin

, 2010
We determine the spin of a supermassive black hole in the context of discseismology by comparing newly detected quasi-periodic oscillations (QPOs) of radio emission in the Galactic centre, Sagittarius A* (Sgr A*), as well as infrared and X-ray emissions ...
Abramowicz, Baganoff, Bardeen, Bardeen, Beskin, Blandford, Bélanger, Gammie, Genzel, Ghez, Gierliński, Gillessen, H. Negoro, Hamaus, Hawley, Hirose, Homan, Kato, Kato, Kato, Kato, Kato, King, M. Miyoshi, Machida, Markowitz, McKinney, Moderski, Novikov, Nowak, Okazaki, Orosz, Page, R. Matsumoto, R. Takahashi, Remillard, Schödel, Shakura, Shapiro, Takahashi, Volonteri, Wilson, Y. Kato, Yuan, Yusef-Zadeh   +44 more
core   +1 more source

Observational evidence for a connection between SMBHs and dark matter haloes [PDF]

, 2004
We investigate the relation between circular velocity vc and bulge velocity dispersion sigma in spiral galaxies, based on literature data and new spectroscopic observations. We find a strong, nearly linear vc-sigma correlation with a negligible intrinsic
Baes, Maarten, Buyle, Pieter, Dejonghe, Herwig, Ferrarese, Laura, Gentile, Gianfranco   +4 more
core   +2 more sources

Dark energy and supermassive black holes [PDF]

Physical Review D, 2004
This paper deals with a cosmological model in which the universe is filled with tachyon dark energy in order to describe current and future accelerating expansion. We obtain that the simplest condition for the regime of phantom energy to occur in this scenario is that the scalar field be Wick rotated to imaginary values which correspond to an axionic ...
openaire   +4 more sources

Supermassive black holes in the early Universe [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015
The recent discovery of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.3 has exacerbated the time compression problem implied by the appearance of supermassive black holes only approximately 900 Myr after the big bang, and only approximately 500 Myr beyond the formation of Pop II and III stars.
F. Melia, T. M. McClintock
openaire   +3 more sources

Probing the formation of the seeds of supermassive black holes with gravitational waves

, 2018
The existence of black holes in the intermediate mass interval between one hundred and ten thousand solar masses, filling the gap between the stellar and the supermassive black holes is a key prediction to explain the origin of luminous QSOs at redshifts
Colpi, Monica
core   +1 more source

Mechanism for the Suppression of Intermediate-Mass Black Holes

, 2010
A model for the formation of supermassive primordial black holes in galactic nuclei with the simultaneous suppression of the formation of intermediate-mass black holes is presented. A bimodal mass function for black holes formed through phase transitions
A. D. Dolgov, A. Dolgov, A. Dolgov, A. King, A. Starobinsky, B. J. McNamara, B. Lanzoni, D. A. Samarchenko, E. Noyola, G. Illingworth, H. Baumgardt, H. Mii, K. Gebhardt, K. J. Mack, L. M. Ozernoy, M. C. Begelman, M. C. Miller, M. G. Haehnelt, M. J. Rees, M. Mapelli, M. Yu. Khlopov, M. Yu. Khlopov, N. Kawakatu, R. R. Islam, R. R. J. Antonucci, S. G. Rubin, S. G. Rubin, S. G. Rubin, S. G. Rubin, S.-J. Rey, T. P. Roberts, V. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, V. I. Dokuchaev, Yu. N. Eroshenko   +39 more
core   +1 more source