Results 91 to 100 of about 22,530 (230)

Gas Motion Mapping for Three Seyfert Galaxies

Open Astronomy, 2011
We report the preliminary results of a kinematical study of three Seyfert galaxies selected from a sample of nearby active galactic nuclei observed using 3D spectroscopy.
Smirnova A., Moiseev A., Katkov I., Afanasiev V.   +3 more
doaj   +1 more source

Survey of Bare Active Galactic Nuclei in the Local Universe (z < 0.2). I. On the Origin of Soft Excess

The Astrophysical Journal Supplement Series, 2023
We analyze a sample of 21 “bare” Seyfert 1 active galactic nuclei, a subclass of Seyfert 1 galaxies, with intrinsic absorption N _H ∼ 10 ^20 cm ^−2 , in the local Universe ( z < 0.2) using XMM-Newton and Swift/XRT observations.
Prantik Nandi, Arka Chatterjee, Arghajit Jana, Sandip K. Chakrabarti, Sachindra Naik, Samar Safi-Harb, Hsiang-Kuang Chang, Jeremy Heyl   +7 more
doaj   +1 more source

Understanding AGN-host connection in partially obscured active galactic nuclei. Part III: Properties of ROSAT-selected SDSS AGNs

, 2010
As the third paper of our serial studies that are aim at examining the AGN-host coevolution by using partially obscured AGNs, we extend the broad-line composite galaxies (composite AGNs) into ROSAT-selected Seyfert 1.8/1.9 galaxies basing upon the RASS ...
Anderson, Antonucci, Bentz, Boller, Boroson, Brandt, Brinkmann, Bromley, Canalizo, Canalizo, Chen, Cid Femandes, Constantin, Daddi, Davies, Desroches, Elitzur, Ferrarese, Flohic, Glazebrook, González Delgado, Granato, Greene, Greene, Greene, Greene, Grupe, Grupe, Grupe, Haring, Heckman, Hickox, Hopkins, Hopkins, Izotov, Izotov, J. Wang, J. Y. Wei, Kaspi, Kaspi, Kauffmann, Kawaguchi, Kewley, Kriss, Laor, Leighly, Magorrian, Mao, Nandra, Parejko, Pounds, Reichard, Rinn, Schartel, Schawinski, Schlegel, Shankar, Shemmer, Silverman, Silverman, Silverman, Spergel, Stasinska, Stockton, Treister, Tremaine, Voges, Walter, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Watabe, Xu, Yuan, Zhou, Zhu   +79 more
core   +1 more source

Mid-infrared Ensemble Variability of Broad-line and Narrow-line Seyfert 1 Galaxies

The Astrophysical Journal
We utilized multiepoch archival data from the Wide-field Infrared Survey Explorer to compare the variability at 3.4 μ m (W1 band) and 4.6 μ m (W2 band) of broad-line Seyfert 1 (BLSy1) galaxies and narrow-line Seyfert 1 (NLSy1) galaxies by employing the ...
Zhipeng Hu, Lisheng Mao
doaj   +1 more source

Very high energy gamma-ray emission of NGC 1275 and 3c382 and the possible activity nature of the Seyfert Galaxies

EPJ Web of Conferences, 2013
Galaxy NGC 1275 is the central dominant galaxy of the Perseus Cluster of Galaxies and is of Seyfert galaxy class. NGC 1275 is known as powerful X-ray and radio source.
Sinitsyna V.Y., Sinitsyna V.G.
doaj   +1 more source

ROSAT Results on Narrow-Line Seyfert 1 Galaxies

, 2000
The excellent soft X-ray sensitivity of the PSPC detector onboard the ROSAT satellite provided the first chance to study precisely the spectral and timing properties of Narrow-Line Seyfert 1 galaxies.
Boller, Boller, Boroson, Brandt, Brandt, Comastri, Guilbert, Halpern, Puchnarewicz, Stephens, Sunyaev, Th. Boller, Trümper, Voges, Walter   +14 more
core   +2 more sources

EVN observations of Seyfert galaxies [PDF]

Proceedings of The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting — PoS(IX EVN Symposium), 2009
In this contribution, we report on dual-frequency EVN observations of six nuclei of Seyfert galaxies imaged previously at arcsecond resolution with the VLA. These galaxies are part of a distancelimited sample of Seyferts, for which VLBI observations are available only for the brightest objects.
Marcello Giroletti, Francesca Panessa
openaire   +2 more sources

Jetted Seyfert Galaxies at z = 0: Simulating Feedback Effects on Galactic Morphology and Beyond

The Astrophysical Journal
We use high-resolution cosmological zoom-in simulations to model feedback from Seyfert-type supermassive black hole (SMBH) jets onto galaxies with identical dark matter (DM) halos of log M / M _⊙  ∼ 11.8. The low-mass,  ∼10 ^6 M _⊙ , seed SMBHs have been
Julianne Goddard, Isaac Shlosman, Emilio Romano-Diaz   +2 more
doaj   +1 more source

Relativistic reflection spectra of super-spinning black holes

European Physical Journal C: Particles and Fields, 2020
We construct a relativistic reflection model in a non-Kerr spacetime in which, depending on the value of the deformation parameter of the metric, there are black hole solutions with spin parameter $$|a_*| > 1$$ |a∗|>1 .
Biao Zhou, Ashutosh Tripathi, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Sourabh Nampalliwar, Menglei Zhou   +6 more
doaj   +1 more source

Low-Mass Seyfert 2 Galaxies in the Sloan Digital Sky Survey

, 2008
(Abridged) We describe a sample of low-mass Seyfert 2 galaxies selected from the Sloan Digital Sky Survey, having a median absolute magnitude of M_g = -19.0 mag.
Aaron J. Barth, Abazajian, Anderson, Barth, Barth, Barth, Barth, Bianchi, Binggeli, Blanton, Boller, Carollo, Condon, Dong, Elitzur, Ferrarese, Filippenko, Gebhardt, Gebhardt, Greene, Greene, Greene, Greene, Greene, Greene, Grupe, Hao, Hao, Heckman, Ho, Ho, Ho, Jenny E. Greene, Kewley, Kim, Kniazev, Kormendy, Kraemer, Laor, Luis C. Ho, Malkan, Mathewson, Miller, Moran, Nicastro, Nicastro, Osterbrock, Peterson, Rigby, Salviander, Satyapal, Schlegel, Seth, Shields, Strateva, Strauss, Thim, Thornton, Tran, Tremaine, Ulvestad, Valluri, Voges, Whittle, Zakamska, Zhou   +65 more
core   +1 more source