scholarly journals Determining Central Black Hole Masses in Distant Active Galaxies

2002 ◽  
Vol 571 (2) ◽  
pp. 733-752 ◽  
Author(s):  
M. Vestergaard
Keyword(s):  
Black Hole ◽  
Active Galaxies ◽  
Central Black Hole ◽  
Black Hole Masses

Central Black Hole Masses in Active Galactic Nuclei Inferred from X‐Ray Variability

1998 ◽  
Vol 500 (2) ◽  
pp. 642-659 ◽  
Author(s):  
Kiyoshi Hayashida ◽  
Sigenori Miyamoto ◽  
Shunji Kitamoto ◽  
Hitoshi Negoro ◽  
Hajime Inoue
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Central Black Hole ◽  
X Ray ◽  
Black Hole Masses

Supermassive Black Holes in Active Galactic Nuclei. I. The Consistency of Black Hole Masses in Quiescent and Active Galaxies

2001 ◽  
Vol 555 (2) ◽  
pp. L79-L82 ◽  
Author(s):  
Laura Ferrarese ◽  
Richard W. Pogge ◽  
Bradley M. Peterson ◽  
David Merritt ◽  
Amri Wandel ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Supermassive Black Holes ◽  
Active Galaxies ◽  
Black Hole Masses

The Megamaser Cosmology Project − XII. VLBI imaging of H2O maser emission in three active galaxies and the effect of AGN winds on disc dynamics

2020 ◽  
Vol 498 (2) ◽  
pp. 1609-1627
Author(s):  
C Y Kuo ◽  
J A Braatz ◽  
C M V Impellizzeri ◽  
F Gao ◽  
D Pesce ◽  
...  
Keyword(s):  
Black Hole ◽  
Active Galaxies ◽  
Black Hole Mass ◽  
Rotating Disc ◽  
Maser Emission ◽  
Gas Kinematics ◽  
Long Baseline ◽  
Show Evidence ◽  
Black Hole Masses

ABSTRACT We present very long baseline interferometry (VLBI) images and kinematics of water maser emission in three active galaxies: NGC 5728, Mrk 1, and IRAS 08452–0011. IRAS 08452–0011, at a distance of ∼200 Mpc, is a triple-peaked H2O megamaser, consistent with a Keplerian rotating disc, indicating a black hole mass of (3.3$\pm 0.2)\times 10^{7}\, \mathrm{ M}_{\odot }$. NGC 5728 and Mrk 1 display double-peaked spectra, and VLBI imaging reveals complicated gas kinematics that do not allow for a robust determination of black hole mass. We show evidence that the masers in NGC 5728 are in a wind while the Mrk 1 maser system has both disc and outflow components. We also find that disturbed morphology and kinematics are a ubiquitous feature of all double-peaked maser systems, implying that these maser sources may reside in environments where active galactic nucleus (AGN) winds are prominent at ∼1 pc scale and have significant impact on the masing gas. Such AGNs tend to have black hole masses $M_{\rm BH}\, \lt$ 8 × 106 M⊙ and Eddington ratios $\lambda _{\rm Edd}\, \gtrsim$ 0.1, while the triple-peaked megamasers show an opposite trend.

scholarly journals Black Hole Masses of Active Galaxies with Double‐peaked Balmer Emission Lines

2006 ◽  
Vol 642 (2) ◽  
pp. 711-719 ◽  
Author(s):  
Karen T. Lewis ◽  
Michael Eracleous
Keyword(s):  
Black Hole ◽  
Active Galaxies ◽  
Emission Lines ◽  
Black Hole Masses
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