scholarly journals Black Hole Masses of Weak Emission Line Quasars Based on the Continuum Fit Method

2020 ◽  
Vol 897 (2) ◽  
pp. 117 ◽  
Author(s):  
Marcin Marculewicz ◽  
Marek Nikolajuk
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Black Hole Masses ◽  
The Continuum

scholarly journals An accretion disk laboratory in the Seyfert 1.9 galaxy NGC 2992

2006 ◽  
Vol 2 (S238) ◽  
pp. 123-126
Author(s):  
Tahir Yaqoob ◽  
Kendrah D. Murphy ◽  
Yuichi Terashima
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Accretion Disk ◽  
Large Amplitude ◽  
Gravitational Energy ◽  
Test Bed ◽  
Central Black Hole ◽  
X Ray ◽  
Order Of Magnitude ◽  
The Continuum

AbstractOver twenty five years of X-ray observations of the Seyfert 1.9 galaxy NGC 2992 show that it is a promising test-bed for severely constraining accretion disk models. The previous interpretation of the historical activity of NGC 2992 in terms of the accretion disk slowly becoming dormant over many years and then ‘re-building’ itself is not supported by new data. A recent year-long monitoring campaign with RXTE showed that the X-ray continuum varied by more than an order of magnitude on a timescale of weeks. During the large-amplitude flares the centroid energy of the Fe K emission-line complex became significantly redshifted, indicating that the violent activity was occurring close to the putative central black hole where gravitational energy shifts can be sufficiently large. For the continuum, the Compton-y parameter remains roughly constant despite the large-amplitude luminosity variability, with (kT) τ ∼ 20–50.

scholarly journals Accurate AGN Black Hole Masses and the Scatter in the MBH–Lbulge Relationship

2009 ◽  
Vol 5 (S267) ◽  
pp. 203-203 ◽  
Author(s):  
C. Martin Gaskell
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Velocity Dispersion ◽  
High Luminosity ◽  
Lower Mass ◽  
Reverberation Mapping ◽  
The Masses ◽  
Black Hole Masses ◽  
The Continuum

AbstractA new empirical formulae is given for estimating the masses of black holes in AGNs from the Hβ velocity dispersion and the continuum luminosity at 5100 Å. It is calibrated to reverberation-mapping and stellar-dynamical estimates of black hole masses. The resulting mass estimates are as accurate as reverberation-mapping and stellar-dynamical estimates. The new mass estimates show that there is very little scatter in the MBH–Lbulge relationship for high-luminosity galaxies, and that the scatter increases substantially in lower-mass galaxies.

scholarly journals Black hole masses from emission‐line widths

2021 ◽  
Author(s):  
Elena Dalla Bontà ◽  
Bradley M. Peterson
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Line Widths ◽  
Black Hole Masses

THE RELATIONSHIP AMONG XBLs, RBLs AND FSRQs

2010 ◽  
Vol 19 (06) ◽  
pp. 909-915
Author(s):  
HONG-GUANG WANG ◽  
JUN-HUI FAN ◽  
YONG HUANG ◽  
JING PAN ◽  
JIANG-HE YANG
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Central Black Hole ◽  
Bl Lacertae Objects ◽  
X Ray ◽  
Bolometric Luminosity ◽  
Bl Lacertae ◽  
Spectrum Radio ◽  
The Relationship ◽  
Black Hole Masses

In this work, we revisited the relationship between the subclasses of blazars (X–ray selected BL Lacertae objects (XBLs), radio selected BL Lacertae objects (RBLs), and flat spectrum radio quasars (FSRQs)) based on a sample of blazars. We found that the FSRQs–RBLs–XBLs relationship is clear in their bolometric luminosity, emission line luminosity and the accretion ratio with V FSRQs > V RBLs > V XBLs , where V stands for the three parameters. However, there is no clear difference amongst their central black hole masses. The bolometric luminosity is closely correlated with the emission line luminosity and the accretion ratio.

Estimating Black Hole Masses of AGNs using Ultraviolet Emission Line Properties

2006 ◽  
Vol 6 (4) ◽  
pp. 396-410 ◽  
Author(s):  
Min-Zhi Kong ◽  
Xue-Bing Wu ◽  
Ran Wang ◽  
Jin-Lin Han
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Ultraviolet Emission ◽  
Black Hole Masses
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