Results 111 to 120 of about 6,380 (236)

X-rays and soft gamma-rays from Seyferts, radio galaxies, and black-hole binaries [PDF]

, 1998
A. A. Zdziarski
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Polarization echoes from past nuclear activity in the quasi-periodic eruption source GSN 069

Astronomy & Astrophysics
Context. X-ray quasi-periodic eruptions (QPEs) are repeating, high-amplitude, soft X-ray bursts observed from the nuclei of a dozen nearby low-mass galaxies. Their origin remains a major puzzle in the physics of accretion variability.
Agís-González B., Hutsemékers D., Liodakis I., Cazzoli S., Sluse D., Miniutti G., Márquez I., Masegosa J., Marin F., Acosta-Pulido J. A., Ramos Almeida C.   +10 more
doaj   +1 more source

Unification Model of Seyfert Galaxies: Are All Seyfert 2 Galaxies Created Equal?

, 2002
2 pages, 2 figures to be published in the proceedings of "Active Galactic Nuclei: From Central Engine to Host Galaxy", Meudon, France, 23-27 July, 2002, ASP Conference Series, Eds. S. Collin, F.
openaire   +2 more sources

Cluster membership of Seyfert galaxies [PDF]

Symposium - International Astronomical Union, 1978
I would like to comment on very preliminary results concerning the cluster membership of Seyfert galaxies. Two years ago van den Bergh stated in a discussion of the bright classical Seyfert galaxies that these objects were mainly field galaxies. We extend this discussion to about seventy objects in the list of Drs Khachikian and Weedman (Astrophys. J.,
openaire   +1 more source

Velocity-resolved Reverberation Mapping of Five Bright Seyfert 1 Galaxies [PDF]

, 2018
G. De Rosa, M. M. Fausnaugh, C. J. Grier, B. M. Peterson, K. D. Denney, Keith Horne, M. C. Bentz, S. Ciroi, E. Dalla Bontà, M. D. Joner, S. Kaspi, C. S. Kochanek, R. W. Pogge, S. G. Sergeev, M. Vestergaard, S. M. Adams, J. Antognini, C. Araya Salvo, E. Armstrong, J. Bae, A. J. Barth, T. G. Beatty, A. Bhattacharjee, G. A. Borman, T. A. Boroson, M. C. Bottorff, J. E. Brown, J. S. Brown, M. S. Brotherton, C. T. Coker, C. Clanton, V. Cracco, S. M. Crawford, K. V. Croxall, S. Eftekharzadeh, M. Eracleous, S. L. Fiorenza, A. Frassati, K. Hawkins, C. B. Henderson, T. W.-S. Holoien, T. Hutchison, J. Kellar, E. Kilerci-Eser, S. Kim, A. L. King, G. La Mura, C. D. Laney, M. Li, C. Lochhaas, Z. Ma, F. MacInnis, E. R. Manne-Nicholas, M. Mason, S. M. McGraw, K. Mogren, C. Montouri, J. W. Moody, A. M. Mosquera, D. Mudd, R. Musso, S. V. Nazarov, M. L. Nguyen, P. Ochner, D. N. Okhmat, C. A. Onken, B. Ou-Yang, A. Pancoast, L. Pei, M. Penny, R. Poleski, E. Portaluri, J.-L. Prieto, A. M. Price-Whelan, N. G. Pulatova, S. Rafter, R. M. Roettenbacher, E. Romero-Colmenero, J. Runnoe, J. S. Schimoia, B. J. Shappee, N. Sherf, G. V. Simonian, A. Siviero, D. M. Skowron, J. Skowron, G. Somers, M. Spencer, D. A. Starkey, D. J. Stevens, R. Stoll, E. Tamajo, J. Tayar, J. L. van Saders, S. Valenti, S. Villanueva, Jr., C. Villforth, Y. Weiss, H. Winkler, J. Zastrow   +99 more
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Observations of the γ-ray-emitting narrow-line Seyfert 1, SBS 0846+513, and its host galaxy [PDF]

, 2021
Timothy S. Hamilton, M. Berton, Sonia Antón, Lorenzo Busoni, A. Caccianiga, S. Ciroi, W. Gässler, Iskren Y. Georgiev, E. Järvelä, S. Komossa, Smita Mathur, S. Rabien   +11 more
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Gas dynamics in the barred Seyfert galaxy NGC 4151 -- II. High-resolution HI study [PDF]

, 1999
C. G. Mundell, A. Pedlar, D. L. Shone, A. Robinson   +3 more
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Seyfert galaxies with Swift: giant flares, rapid drops, and other surprises [PDF]

, 2015
S. Komossa, D. Grupe, R. D. Saxton, Luigi Gallo   +3 more
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The Chandra High Energy Transmission Grating Spectrometer probes the dusty warm absorber in the Seyfert 1 galaxy MCG--6-30-15 [PDF]

, 2001
J. C. Lee, C. R. Canizares, Herman L. Marshall, A. C. Fabian, M. López‐Chicano, Norbert S. Schulz, K. Iwasawa   +6 more
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Two 100 TeV Neutrinos Coincident with the Seyfert Galaxy NGC 7469

The Astrophysical Journal
In 2013, the IceCube collaboration announced the detection of a diffuse high-energy astrophysical neutrino flux. The origin of this flux is still largely unknown. The most significant individual source is the close-by Seyfert galaxy NGC 1068 at the 4.2 σ
Giacomo Sommani, Anna Franckowiak, Massimiliano Lincetto, Ralf-Jürgen Dettmar   +3 more
doaj   +1 more source