Evidence for a Massive Black Hole in the Active Galaxy NGC 4261 from Hubble Space Telescope Images and Spectra

1996 ◽  
Vol 470 ◽  
pp. 444 ◽  
Author(s):  
Laura Ferrarese ◽  
Holland C. Ford ◽  
Walter Jaffe
Keyword(s):  
Black Hole ◽  
Hubble Space Telescope ◽  
Active Galaxy ◽  
Massive Black Hole ◽  
Space Telescope

scholarly journals Circum-nuclear molecular disks: Role in AGN fueling and feedback

2019 ◽  
Vol 15 (S359) ◽  
pp. 312-317
Author(s):  
Francoise Combes
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
High Resolution ◽  
Large Scale ◽  
Active Galaxy ◽  
Small Scale ◽  
Massive Black Hole ◽  
Molecular Outflows ◽  
Molecular Outflow

AbstractGas fueling AGN (Active Galaxy Nuclei) is now traceable at high-resolution with ALMA (Atacama Large Millimeter Array) and NOEMA (NOrthern Extended Millimeter Array). Dynamical mechanisms are essential to exchange angular momentum and drive the gas to the super-massive black hole. While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent observations reaching 10pc scale (50mas), may bring smoking gun evidence of fueling, within a randomly oriented nuclear gas disk. AGN feedback is also observed, in the form of narrow and collimated molecular outflows, which point towards the radio mode, or entrainment by a radio jet. Precession has been observed in a molecular outflow, indicating the precession of the radio jet. One of the best candidates for precession is the Bardeen-Petterson effect at small scale, which exerts a torque on the accreting material, and produces an extended disk warp. The misalignment between the inner and large-scale disk, enhances the coupling of the AGN feedback, since the jet sweeps a large part of the molecular disk.

scholarly journals 11.16. On the origin of density cusp in galactic nuclei by central black hole

1998 ◽  
Vol 184 ◽  
pp. 487-488
Author(s):  
T. Nakano ◽  
T. Fukushige ◽  
J. Makino
Keyword(s):  
Black Hole ◽  
Hubble Space Telescope ◽  
Outer Region ◽  
Elliptical Galaxies ◽  
Heating Process ◽  
Massive Black Hole ◽  
Weak Density ◽  
The Galaxy ◽  
Galaxy Model ◽  
Inner Region

We investigated the dynamical reaction of the central region of galaxies to a falling massive black hole by N-body simulations. As the initial galaxy model, we used an isothermal King model and placed a massive black hole at around the half-mass radius of the galaxy. We found that the central core of the galaxy is destroyed by the heating due to the black hole and a very weak density cusp (ρ ∝ r−α, with α ∼ 0.5) is formed around the center. This result is consistent with recent observations of large elliptical galaxies by Hubble Space Telescope (Lauer et al. 1995; Byun et al. 1996; Gebhardt et al. 1996; Faber et al. 1996; Kormendy et al. 1996). The radius of the weak cusp region is large for large black hole mass. The velocity of the stars become tangentially anisotropic in the inner region, while in the outer region the stars have radially anisotropic velocity dispersion. Our result naturally explains the mechanism of the formation of the weak cusp found in the previous simulations of galaxy merging, and implies that the weak cusp observed in large elliptical galaxies may be formed by the heating process by sinking black holes during merging events.

scholarly journals [ITAL]Hubble Space Telescope[/ITAL] Evidence for an Intermediate-Mass Black Hole in the Globular Cluster M15. I. STIS Spectroscopy and WFPC2 Photometry

2002 ◽  
Vol 124 (6) ◽  
pp. 3255-3269 ◽  
Author(s):  
Roeland P. van der Marel ◽  
Joris Gerssen ◽  
Puragra Guhathakurta ◽  
Ruth C. Peterson ◽  
Karl Gebhardt
Keyword(s):  
Black Hole ◽  
Globular Cluster ◽  
Hubble Space Telescope ◽  
Intermediate Mass ◽  
Space Telescope

scholarly journals 10.8. A massive black hole in the active galaxy NGC6251

1998 ◽  
Vol 184 ◽  
pp. 445-446
Author(s):  
Laura Ferrarese ◽  
Holland C. Ford ◽  
Walter Jaffe
Keyword(s):  
Black Hole ◽  
Active Galaxy ◽  
Host Galaxy ◽  
Radio Sources ◽  
Massive Black Hole ◽  
Heliocentric Velocity

NGC 6251 is an E2 galaxy with mB = 13.6 mag (RC3) and heliocentric velocity 7400 km s−1(=106 Mpc for H0 = 70 km s−1Mpc−1). It is the host galaxy of one of the largest known radio sources in the sky: the radio lobes extend for 1°.2 (over 2 Mpc, Waggett et al. 1977, Readhead et al. 1978, Cohen and Readhead 1979, Jones et al. 1986, Jones and Wehrle 1994).

scholarly journals Space Telescope Observations of Globular Clusters

1985 ◽  
Vol 113 ◽  
pp. 481-498
Author(s):  
John N. Bahcall
Keyword(s):  
Black Hole ◽  
Globular Clusters ◽  
Luminosity Function ◽  
Elliptical Galaxies ◽  
Core Collapse ◽  
Massive Black Hole ◽  
Space Telescope ◽  
Galactic Clusters ◽  
Mass Segregation

Six proposed Space Telescope programs involving globular clusters are described. The projects appropriate for galactic clusters are: the detection of white dwarfs, the study of the faint end of the Population II luminosity function, the measurement of mass segregation, and the search for a cusp in the density distribution caused by core collapse or by a massive black hole. The two programs that involve extragalactic globular clusters are: the determination of the luminosity function of clusters around different galaxies and the measurement of tidal radii of clusters surrounding elliptical galaxies.

[ITAL]Hubble Space Telescope[/ITAL] Evidence for an Intermediate-Mass Black Hole in the Globular Cluster M15. II. Kinematic Analysis and Dynamical Modeling

2002 ◽  
Vol 124 (6) ◽  
pp. 3270-3288 ◽  
Author(s):  
Joris Gerssen ◽  
Roeland P. van der Marel ◽  
Karl Gebhardt ◽  
Puragra Guhathakurta ◽  
Ruth C. Peterson ◽  
...  
Keyword(s):  
Black Hole ◽  
Globular Cluster ◽  
Kinematic Analysis ◽  
Hubble Space Telescope ◽  
Intermediate Mass ◽  
Dynamical Modeling ◽  
Space Telescope

[ITAL]Hubble Space Telescope[/ITAL] Spectroscopic Evidence for a 1 × 10[TSUP]9[/TSUP] [ITAL]M[/ITAL][TINF]⊙[/TINF] Black Hole in NGC 4594

1996 ◽  
Vol 473 (2) ◽  
pp. L91-L94 ◽  
Author(s):  
John Kormendy ◽  
Ralf Bender ◽  
Edward A. Ajhar ◽  
Alan Dressler ◽  
S. M. Faber ◽  
...  
Keyword(s):  
Black Hole ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Spectroscopic Evidence
Sign in / Sign up

Export Citation Format

Share Document