scholarly journals Obscuration and Scattering in Narrow-Line Seyfert 1s

Universe ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 73 ◽  
Author(s):  
Xiang Pan ◽  
Hongyan Zhou ◽  
Peng Jiang
Keyword(s):  
Joint Analysis ◽  
Narrow Line ◽  
High Luminosity ◽  
Host Galaxies ◽  
Broad Emission ◽  
Radiation Properties ◽  
Multi Wavelength ◽  
Broad Emission Line ◽  
Intercomparison Study ◽  
Made In

Narrow-line Seyfert 1s (NLS1s) observed at large inclinations from face-on are important for understanding this amazing AGN subclass. However, progress is slowly being made in the huntings and studies of highly obscured (EB–V ≥ 1) NLS1s. Recently, we discovered that multi-wavelength photometric and polarimetric analysis can be of great help in identifying and studying highly obscured NLS1s. This paper presents an intercomparison study of three typical highly obscured NLS1s. By joint analysis of extinction, absorption lines, and scattered AGN radiation, properties of the nucleus (disk and broad emission line regions) are measured. Physical and geometrical conditions about circum-nucleus obscuring/scattering clouds are also estimated. In addition, the host galaxies which are usually difficult to observe in such high luminosity NLS1s are also revealed in these targets. The results show that obscuration and scattering can be powerful probes to obscured NLS1s. Analogues of these obscured NLS1s are found to widely exist. In addition, they will be followed up in our future works, so as to understand the nuclei, circum-nucleus clouds, and host galaxies of NLS1s.

scholarly journals Near infrared hydrogen emission line ratios as diagnostics of the broad emission line region

2012 ◽  
Vol 372 ◽  
pp. 012069
Author(s):  
Andrea J Ruff ◽  
David J E Floyd ◽  
Kirk T Korista ◽  
Rachel L Webster ◽  
Ryan L Porter ◽  
...  
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Hydrogen Emission ◽  
Broad Emission ◽  
Line Region ◽  
Broad Emission Line ◽  
Hydrogen Emission Line

scholarly journals Broad emission line variability in 3C 273 *

1989 ◽  
Vol 240 (4) ◽  
pp. 741-751 ◽  
Author(s):  
P. T. O'Brien ◽  
W. Zheng ◽  
R. Wilson
Keyword(s):  
Emission Line ◽  
Broad Emission ◽  
Broad Emission Line

A tunable narrow-line-width multi-wavelength Er-doped fiber laser based on a high birefringence fiber ring mirror and an auto-tracking filter

2008 ◽  
Vol 281 (1) ◽  
pp. 90-93 ◽  
Author(s):  
Xiu-jie Jia ◽  
Yan-ge Liu ◽  
Li-bin Si ◽  
Zhan-cheng Guo ◽  
Sheng-gui Fu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Line Width ◽  
Narrow Line ◽  
Fiber Ring ◽  
High Birefringence ◽  
Narrow Line Width ◽  
Multi Wavelength ◽  
Tracking Filter ◽  
Er Doped

Host Galaxies and Environment of Narrow Line Seyfert 1 Nuclei

2001 ◽  
pp. 273-275
Author(s):  
Y. Krongold ◽  
D. Dultzin-Hacyan ◽  
P. Marziani
Keyword(s):  
Narrow Line ◽  
Host Galaxies

scholarly journals The X-SHOOTER/ALMA Sample of Quasars in the Epoch of Reionization. I. NIR Spectral Modeling, Iron Enrichment, and Broad Emission Line Properties

2020 ◽  
Vol 905 (1) ◽  
pp. 51
Author(s):  
Jan-Torge Schindler ◽  
Emanuele Paolo Farina ◽  
Eduardo Bañados ◽  
Anna-Christina Eilers ◽  
Joseph F. Hennawi ◽  
...  
Keyword(s):  
Emission Line ◽  
Spectral Modeling ◽  
Iron Enrichment ◽  
Broad Emission ◽  
Broad Emission Line

scholarly journals Star Clusters in Quasars: Bloated Stars as Broad Emission Line Clouds

1989 ◽  
Vol 134 ◽  
pp. 137-138
Author(s):  
R. C. Puetter
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Star Clusters ◽  
Hole Formation ◽  
Line Radiation ◽  
Black Hole Formation ◽  
Broad Emission ◽  
Broad Emission Line

Many scenarios of the evolution of star clusters in the centers of galaxies involve the formation of a central supermassive object. Since black hole formation is not 100% efficient in mass usage, stars are left over. This paper investigates the properties of such stars and proposes that their externally heated atmospheres become “bloated” due to radiative forces from trapped line radiation. Such stars would swell to many times their normal diameters and acquire densities, sizes, and mean column masses typical of QSO/AGN emission line clouds (ELCs).

scholarly journals Velocity Diagnostics of the Broad Emission-Line Region of Active Galactic Nuclei

1997 ◽  
Vol 159 ◽  
pp. 175-178 ◽  
Author(s):  
Brian Espey
Keyword(s):  
Emission Line ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Nuclear Region ◽  
Driving Mechanisms ◽  
Broad Emission ◽  
Line Region ◽  
Broad Emission Line ◽  
Ongoing Project

AbstractWe present a brief review of emission-line velocity differences, and describe an ongoing project to determine the driving mechanisms responsible. We conclude with a brief outline of the use of velocity differences as probes of the conditions in the nuclear region of AGNs.

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