scholarly journals Polarized Broad‐Line Emission from Low‐Luminosity Active Galactic Nuclei

1999 ◽  
Vol 525 (2) ◽  
pp. 673-684 ◽  
Author(s):  
Aaron J. Barth ◽  
Alexei V. Filippenko ◽  
Edward C. Moran
Keyword(s):  
Active Galactic Nuclei ◽  
Line Emission ◽  
Galactic Nuclei ◽  
Broad Line

scholarly journals SDSS J0159 as an outlier in the MBH–σ space: further clues to support a central tidal disruption event?

2019 ◽  
Vol 490 (1) ◽  
pp. L81-L85 ◽  
Author(s):  
Xue-Guang Zhang ◽  
Min Bao ◽  
QiRong Yuan
Keyword(s):  
Active Galactic Nuclei ◽  
Line Emission ◽  
Galactic Nuclei ◽  
Host Galaxy ◽  
Broad Line ◽  
Tidal Disruption ◽  
Stellar Velocity ◽  
Interesting Object ◽  
Absorption Features ◽  
Disruption Event

ABSTRACT In this Letter, properties of black hole (BH) mass are well checked for the interesting object SDSS J0159, a changing-look active galactic nuclei and also a host galaxy of a tidal disruption event (TDE). Through spectral absorption features, the stellar velocity dispersion of SDSS J0159 can be well measured as $\sigma \sim 81~{\rm km\, s}^{-1}$, leading to SDSS J0159 being an apparent outlier in the MBH–σ space, because of the BH mass estimated through the MBH–σ relation about two magnitudes lower than the reported virial BH mass of about 108 M⊙. After considerations of contributions of stellar debris from the central TDE to broad line emission clouds, the overestimated virial BH mass could be well explained in SDSS J0159. Therefore, overestimated virial BH masses through broad-line properties in the MBH–σ space could be treated as interesting clues to support central TDEs.

scholarly journals Evolution of broad-line emission from active galactic nuclei

2014 ◽  
Vol 438 (4) ◽  
pp. 3340-3351 ◽  
Author(s):  
Moshe Elitzur ◽  
Luis C. Ho ◽  
Jonathan R. Trump
Keyword(s):  
Active Galactic Nuclei ◽  
Line Emission ◽  
Galactic Nuclei ◽  
Broad Line

Neutrino-heated stars and broad-line emission from active galactic nuclei

1991 ◽  
Vol 378 ◽  
pp. 30 ◽  
Author(s):  
James MacDonald ◽  
Todor Stanev ◽  
Peter L. Biermann
Keyword(s):  
Active Galactic Nuclei ◽  
Line Emission ◽  
Galactic Nuclei ◽  
Broad Line

scholarly journals Anisotropic line emission and the geometry of the broad-line region in active galactic nuclei

1992 ◽  
Vol 387 ◽  
pp. 95 ◽  
Author(s):  
G. J. Ferland ◽  
B. M. Peterson ◽  
K. Horne ◽  
W. F. Welsh ◽  
S. N. Nahar
Keyword(s):  
Active Galactic Nuclei ◽  
Line Emission ◽  
Galactic Nuclei ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region

SDSS J154751.94+025550 with double-peaked broad H β but single-peaked broad H α: a candidate for central binary black hole system?

2021 ◽  
Vol 507 (4) ◽  
pp. 5205-5213
Author(s):  
XueGuang Zhang
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Emission Lines ◽  
Broad Line ◽  
Line Profiles ◽  
Physical Conditions ◽  
Binary Black Hole ◽  
Sinusoidal Function

ABSTRACT In this manuscript, an interesting blue active galactic nuclei (AGNs) SDSS J154751.94+025550 (=SDSS J1547) is reported with very different line profiles of broad Balmer emission lines: double-peaked broad H β but single-peaked broad H α. SDSS J1547 is the first AGN with detailed discussions on very different line profiles of the broad Balmer emission lines, besides the simply mentioned different broad lines in the candidate for a binary black hole (BBH) system in SDSS J0159+0105. The very different line profiles of the broad Balmer emission lines can be well explained by different physical conditions to two central BLRs in a central BBH system in SDSS J1547. Furthermore, the long-term light curve from CSS can be well described by a sinusoidal function with a periodicity about 2159 d, providing further evidence to support the expected central BBH system in SDSS J1547. Therefore, it is interesting to treat different line profiles of broad Balmer emission lines as intrinsic indicators of central BBH systems in broad line AGN. Under assumptions of BBH systems, 0.125 per cent of broad-line AGN can be expected to have very different line profiles of broad Balmer emission lines. Future study on more broad line AGN with very different line profiles of broad Balmer emission lines could provide further clues on the different line profiles of broad Balmer emission lines as indicator of BBH systems.

scholarly journals Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. X. Variability of Fairall 9 from Optical Data

1997 ◽  
Vol 112 (2) ◽  
pp. 271-283 ◽  
Author(s):  
M. Santos‐Lleo ◽  
E. Chatzichristou ◽  
C. Mendes de Oliveira ◽  
C. Winge ◽  
D. Alloin ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Optical Data ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region ◽  
Size And Structure
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