Results 11 to 20 of about 6,087 (169)
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 V ron Catalog (13th). We used the "{\it{FracDev}}" parameter from SDSS galaxy fitting models to represent the bulge fractions of the Seyfert host ...
Yen Chen Chen, Chorng Yuan Hwang
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Activity of the Seyfert galaxy neighbours [PDF]
Astronomy & Astrophysics, 2013 Accepted for publication in A&A. 17 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:0910.1355v1 (withdrawn)
I. Georgantopoulos +8 more
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Chemical evolution of Seyfert galaxies [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractWe computed the chemical evolution of Seyfert galaxies, residing in spiral bulges, based on an updated model for the Milky Way bulge with updated calculations of the Galactic potential and of the feedback from the central supermassive black hole (BH) in a spherical approximation. We followed the evolution of bulges of masses 2 × 109 − 1011M⊙ by
S. K. Ballero +2 more
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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.
V. V. Mustsevoi +4 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 [...]
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Unabsorbed Seyfert 2 galaxies [PDF]
Astronomy & Astrophysics, 2002 We present a sample of 17 type 2 Seyfert galaxies which have an X-ray column density lower than 10^{22} cm^{-2}. The Compton thin nature of these sources is strongly suggested by isotropic indicators. We estimate the fraction of these sources to be in the range of 10% - 30% of the population of type 2 Seyfert galaxies.
Francesca Panessa, Loredana Bassani
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Jet Directions in Seyfert Galaxies [PDF]
The Astrophysical Journal, 2000 We present the study of the relative angle between the accretion disk (or radio jet) and the galaxy disk for a sample of Seyfert galaxies selected from a mostly isotropic property, the 60$ $m flux. For each galaxy we have a pair of points ($i$,$ $), which are the inclination of the galaxy relative to the line of sight and the angle between the jet ...
Cathie J. Clarke +6 more
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An Investigation into the Geometry of Seyfert Galaxies [PDF]
The Astrophysical Journal, 1998 We present a new method for the statistical investigation into the distributions of the angle beta between the radio axis and the normal to the galactic disk for a sample of Seyfert galaxies. We discuss how further observations of the sample galaxies can strengthen the conclusions.
A. L. Kinney +6 more
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Symposium - International Astronomical Union, 1982 Observations of sample of Markarian Seyferts with the VLA indicate that a large fraction possess linear radio structure on a scale of a few hundred parsecs to a few kiloparsecs. The radio components generally straddle the optical nucleus and several sources are simple doubles.
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Seyfert galaxies and BeppoSAX [PDF]
Nuclear Physics B - Proceedings Supplements, 1999 The contributions that BeppoSAX is expected to give and, after one and a half year of operation, has already given to our knowledge of both type 1 and type 2 Seyfert galaxies are outlined and reviewed.
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