Results 21 to 30 of about 152,801 (176)

Is There a Metallicity-Luminosity Relationship in Active Galactic Nuclei? The Case of Narrow-Line Seyfert 1 Galaxies [PDF]

, 2002
This article discusses the relationship between metallicity and luminosity in active galactic nuclei by introducing new metallicity measurements for a sample of narrow-line Seyfert 1 ...
Netzer, Hagai, Ohad Shemmer, Shemmer, Ohad, Hagai Netzer   +3 more
core   +1 more source

Reverberation Mapping and Implications for Narrow-Line Seyfert 1 Galaxies [PDF]

, 2018
Reverberation mapping is the principal method for determining the masses of the central black holes that power AGNs. I will discuss recent reverberation mapping results in the context of how these affect our understanding of narrow-line Seyfert 1 ...
Dalla Bontà, Elena, Peterson, B., Dalla Bontà, Elena (5114189), Bradley Peterson, Elena Dalla Bontà, Dalla Bontà, E., Peterson, Bradley, Peterson, Bradley (5114186)   +7 more
core   +1 more source

Intermediate Seyfert: optical spectroscopic characteristics [PDF]

, 2022
openActive Galactic Nuclei (AGN) are a particular class of galaxies characterized by a pretty luminous central region produced by an accreting disk. According to the Unified Model (UM) around this central structure we can recognize three regions: the ...
DALLA BARBA, BENEDETTA
core  

Optical polarimetry studies of Seyfert galaxies [PDF]

, 1999
Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
core   +1 more source

What We Talk about When We Talk about Blazars?

Frontiers in Astronomy and Space Sciences, 2017
After the discovery of powerful relativistic jets from Narrow-Line Seyfert 1 Galaxies, and the understanding of their similarity with those of blazars, a problem of terminology was born.
Luigi Foschini
doaj   +1 more source

Spatially Resolved BPT Mapping of Nearby Seyfert 2 Galaxies

, 2021
We present spatially resolved Baldwin–Phillips–Terlevich (BPT) mapping of the extended narrow-line regions (ENLRs) of seven nearby Seyfert 2 galaxies, using Hubble Space Telescope narrowband filter imaging.
Fabbiano, Giuseppina, Storchi-Bergmann, Thaisa, Karovska, Margarita, Wang, Junfeng, Ma, Jingzhe, Maksym, W. Peter, Travascio, Andrea, Elvis, Martin   +7 more
core   +1 more source

Large-Scale Environment Properties of Narrow-Line Seyfert 1 Galaxies at z < 0.4

Frontiers in Astronomy and Space Sciences, 2017
The large-scale environment is believed to affect the evolution and intrinsic properties of galaxies. It offers a new perspective on narrow-line Seyfert 1 galaxies (NLS1) which have not been extensively studied in this context before.
Emilia Järvelä, Emilia Järvelä, A. Lähteenmäki, A. Lähteenmäki, A. Lähteenmäki, H. Lietzen   +5 more
doaj   +1 more source

Broad line emission from iron K- and L-shell transitions in the active galaxy 1H 0707-495

, 2009
Since the 1995 discovery of the broad iron K-line emission from the Seyfert galaxy MCG-6-30-15 (ref. 1), broad iron K lines have been found in emission from several other Seyfert galaxies, from accreting stellar-mass black holes and even from accreting ...
T. Boller, Reynolds, C., Tanaka, Y, Larsson, J., Reynolds, C.S., Boller, T., Zoghbi, A., Y. Tanaka, G. Miniutti, Brandt, W.N., Zoghbi, A, Blustin, A., Reis, R.C., W. N. Brandt, Ponti, G, Ross, R., Uttley, P., Cadallero-Garcia, M., C. S. Reynolds, Blustin, A. J., Caballero-Garcia, M.D., Young, A.J., P. Uttley, Reynolds, C.S, Miller, J.M., Ross, R.R., A. C. Fabian, Uttley, P, Tanaka, Y., Young, A.J, L. C. Gallo, J. M. Miller, Miniutti, G, Brandt, W. N., G. Ponti, Fabian, A.C., Brandt, W, Blustin, A.J, Reis, R., Reis, R. C., Blustin, A.J., A. J. Blustin, J. Larsson, Ross, R. R., Miller, J.M, A. Zoghbi, R. C. Reis, M. D. Caballero-Garcia, A. J. Young, Ross, R.R, Miller, Jon M., Brandt, W., Gallo, L. C., Fabian, A., Caballero-Garcia, M. D., Ponti, G., Miniutti, G., Larsson, J, R. R. Ross, Gallo, L., Young, A., Fabian, A.C, Fabian, Andy C., Caballero-Garcia, M.D, Boller, T, Reynolds, Christopher S., Miniutti, Giovanni, Gallo, L.C., Miller, J., Reis, R.C, Young, A. J.   +70 more
core   +1 more source

Narrow Line Seyfert 1s in the IBISCO Sample [PDF]

, 2018
financial support from NuSTAR (NARO16)/ASI/INAF agreement F.O. 1.05.05.95 and ASI/INTEGRAL agreement F.O. 1.05.04.20.04We present the broad-band soft and hard X-ray spectral analysis of 8 Narrow Line Seyfert 1 galaxies extracted from the IBISCO Sample ...
Fabrizio Fiore, Molina, M., Manuela Molina, Angela Malizia, Fiore, F., Feruglio, C., MALIZIA, ANGELA, Chiara Feruglio   +7 more
core   +1 more source

Growth of Accreting Supermassive Black Hole Seeds and Neutrino Radiation

Journal of Astrophysics, Volume 2015, Issue 1, 2015., 2015
In the framework of microscopic theory of black hole (MTBH), which explores the most important processes of rearrangement of vacuum state and spontaneous breaking of gravitation gauge symmetry at huge energies, we have undertaken a large series of numerical simulations with the goal to trace an evolution of the mass assembly history of 377 plausible ...
Gagik Ter-Kazarian, Gary Wegner
wiley   +1 more source