Results 101 to 110 of about 512 (184)

Are “Changing-look” Active Galactic Nuclei Special in the Coevolution of Supermassive Black Holes and their Hosts? II. The Case of Changing-look Narrow-line Seyfert 1 Galaxies

The Astrophysical Journal
The evolutionary role of the so-called “changing-look” (CL) active galactic nucleus (AGN), which is characterized by spectral-type transitions within ∼10 yr, has been suggested in the past few years. By focusing on CL-AGNs having spectra similar to those
J. Wang, S. Jin, D. W. Xu, WeiKang Zheng, Thomas G. Brink, S. Komossa, Alexei V. Filippenko, J. Y. Wei   +7 more
doaj   +1 more source

RAD@home Citizen Science Discovery of Two Spiral Galaxies Where the 30–220 kpc Radio Lobes Are Possibly Shaped by Ram Pressure Stripping

Galaxies
We report the RAD@home citizen science discovery of two rare spiral-host radio galaxies (NGC 3898 and WISEA J221656.57-132042434.1 or RAD-“Thumbs up” galaxy), both exhibiting asymmetric radio lobes extending over 30 to 220 kiloparsec scales. We present a
Prakash Apoorva, Ananda Hota, Pratik Dabhade, P. K. Navaneeth, Dhruv Nayak, Arundhati Purohit   +5 more
doaj   +1 more source

BASS

Astronomy & Astrophysics
X-ray variability is a well-established characteristic of active galactic nuclei (AGNs) known to correlate inversely with both the supermassive black hole mass (MBH) and luminosity, although the degree of each remains a topic of debate.
Signorini Matilde, Ricci Federica, Tortosa Alessia, Bianchi Stefano, La Franca Fabio, Bauer Franz E., Harrison Fiona A., Ichikawa Kohei, Jana Arghajit, Koss Michael J., Liu Tingting, Oh Kyuseok, Peca Alessandro, Powell Meredith, Ricci Claudio, Sanders David B., Serafinelli Roberto, Stern Daniel, Trakhtenbrot Benny, Treister Ezequiel, Urry Megan   +20 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

Neutrino Signal from a Population of Seyfert Galaxies

Physical Review Letters
IceCube collaboration has previously reported an evidence for neutrino signal from a Seyfert galaxy NGC 1068. This may suggest that all Seyfert galaxies emit neutrinos. To test this hypothesis, we identify the best candidate neutrino sources among nearby Seyfert galaxies, based on their hard X-ray properties.
A. Neronov, D. Savchenko, D. V. Semikoz   +2 more
openaire   +3 more sources

SIFTING FOR SAPPHIRES: SYSTEMATIC SELECTION OF TIDAL DISRUPTION EVENTS IN iPTF. [PDF]

Astrophys J Suppl Ser, 2018
Hung T, Gezari S, Cenko SB, van Velzen S, Blagorodnova N, Yan L, Kulkarni SR, Lunnan R, Kupfer T, Leloudas G, Kong AKH, Nugent PE, Fremling C, Laher RR, Masci FJ, Cao Y, Roy R, Petrushevska T.   +17 more
europepmc   +1 more source

Testing The Lamp-Post and Wind Reverberation Models with XMM-Newton Observations of NGC 5506. [PDF]

Astrophys J, 2020
Zoghbi A, Kalli S, Miller JM, Mizumoto M.   +3 more
europepmc   +1 more source

Galaxy Evolution with Manifold Learning. [PDF]

Entropy (Basel)
Takeuchi TT, Cooray S, Kano RR.
europepmc   +1 more source

Variable Nature of Magnetically-Driven Ultra-Fast Outflows. [PDF]

Astrophys J Lett, 2018
Fukumura K, Kazanas D, Shrader C, Behar E, Tombesi F, Contopoulos I.   +5 more
europepmc   +1 more source

The polarization of Seyfert galaxies

The Astrophysical Journal, 1983
P. G. Martin, I. B. Thompson, J. Maza, J. R. P. Angel   +3 more
openaire   +1 more source