Results 1 to 10 of about 125,183 (220)
Estimate of SMBH Spin for Narrow-Line Seyfert 1 Galaxies
Universe, 2023 We estimated the spin values of the supermassive black holes (SMBHs) of the active galactic nuclei (AGN) for a large set of Narrow Line Seyfert 1 (NLS1) galaxies assuming the inclination angle between the line of sight and the axis of the accretion disk ...
Mikhail Piotrovich +2 more
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Seyfert Galaxies Astrophysics [PDF]
Universe, 2020 Looking back in time, it is somehow surprising to see the enormous advancement made by astrophysics in just about one century [...]
Luigi Foschini
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A spectropolarimetric atlas of Seyfert 1 galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We present optical spectropolarimetry of the nuclei of 36 Seyfert 1 galaxies, obtained with the William Herschel and the Anglo-Australian Telescopes from 1996 to 1999. In 20 of these, the optical emission from the active nucleus is intrinsically polarized.
J H Hough, Hough J H, Young S
exaly +3 more sources
Narrow-line Seyfert 1 galaxies and the evolution of galaxies and active galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 Narrow Line Seyfert 1 galaxies (NLS1s) are intriguing due to their continuum as well as emission line properties. The observed peculiar properties of the NLS1s are believed to be due to accretion rate close to Eddington limit. As a consequence, for a given luminosity, NLS1s have smaller black hole (BH) masses compared to normal Seyfert galaxies.
Smita Mathur, Mathur Smita
exaly +3 more sources
HNC, HCN and CN in Seyfert galaxies [PDF]
Astronomy and Astrophysics, 2007 Accepted for publication in A&A. A selection of this paper will be presented as a poster in the FIR workshop 2007, held at Bad Honnef, Germany. High resolution figures in original paper.
J P Perez-Beaupuits
exaly +4 more sources
Iraqi Journal of Physics, 2021 An optical spectroscopic study is reported in this article to study the correlation between the supermassive black hole (SMBH) and the star formation rate (SFR) for a sample of Seyfert galaxies type (I and II).
Salwa H. Kareem, Yasir Ezzuldeen Rashed
doaj +1 more source
Morphology of Seyfert Galaxies [PDF]
Astronomy Reports, 2017 We probed the relation between properties of Seyfert nuclei and morphology of their host galaxies. We selected Seyfert galaxies from the Sloan Digital Sky Survey with redshifts less 0.2 identified by the Véron Catalog (13th). We used the "{\it{FracDev}}" parameter from SDSS galaxy fitting models to represent the bulge fractions of the Seyfert host ...
Chen, Yen-Chen, Hwang, Chorng-Yuan
openaire +2 more sources
Nested and Single Bars in Seyfert and Non‐Seyfert Galaxies [PDF]
The Astrophysical Journal, 2002 33 pages, including 23 postscript figures, fixed a problem with deprojected position angle profiles and the resulting bar classifications and statistics numbers and figures and tables, to appear in ...
Laine, Seppo +3 more
openaire +4 more sources
Does Feedback from Supermassive Black Holes Coevolve with the Host in Type 2 Quasars?
The Astrophysical Journal, 2023 The feedback from the accretion of central supermassive black holes (SMBHs) is a hot topic in the coevolution of SMBHs and their host galaxies. By tracing the large-scale outflow using the line profile and bulk velocity shift of [O iii ] λ 5007, the ...
S. Jin +7 more
doaj +1 more source
Helical Structures in Seyfert Galaxies [PDF]
International Astronomical Union Colloquium, 2002 Abstract Seyfert galaxies with Z-shaped emission filaments in the Narrow Line Region (NLR) are considered. We assume that observable Z-shaped structures and the velocity pattern of the NLR may be explained as tri-dimensional helical waves in the ionization cone.
Moiseev, A. V. +4 more
openaire +2 more sources