Results 91 to 100 of about 512 (184)

Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus. [PDF]

iScience, 2021
Cackett EM, Bentz MC, Kara E.
europepmc   +1 more source

SPECTRAL AND PHOTOMETRIC STUDIES OF MRK6 AND MRK1040 IN THE OPTICAL RANGE

Eurasian Physical Technical Journal
This paper is dedicated to the study of variability in active galactic nuclei, which play a key role in understanding the physical processes occurring in their central regions.
S.A. Shomshekova, E.K. Denissyuk, L.N. Kondratyeva, A.V. Serebryanskiy, G.K. Aimanova, L. Aktay   +5 more
doaj   +1 more source

Spectra of Seyfert galaxies and Seyfert galaxy candidates

The Astrophysical Journal, 1983
D. E. Osterbrock, O. Dahari
openaire   +1 more source

The Disk Wind Contribution to the Gamma-Ray Emission from the Nearby Seyfert Galaxy GRS 1734−292

The Astrophysical Journal
Radio-quiet Seyfert galaxies have been detected in GeV gamma rays by the Fermi Large Area Telescope (LAT), but the origin of much of this emission is unclear.
Nobuyuki Sakai, Tomoya Yamada, Yoshiyuki Inoue, Ellis R. Owen, Tomonari Michiyama, Ryota Tomaru, Yasushi Fukazawa   +6 more
doaj   +1 more source

The Host Galaxy Fluxes of Active Galaxy Nuclei Are Generally Overestimated by the Flux Variation Gradient Method

Universe
In terms of the variable nature of normal active galaxy nuclei (AGN) and luminous quasars, a so-called flux variation gradient (FVG) method has been widely utilized to estimate the underlying non-variable host galaxy fluxes.
Minxuan Cai, Zhen Wan, Zhenyi Cai, Lulu Fan, Junxian Wang   +4 more
doaj   +1 more source

The extent of ionization in simulations of radio-loud AGNs impacting kpc gas discs. [PDF]

Mon Not R Astron Soc, 2022
Meenakshi M, Mukherjee D, Wagner AY, Nesvadba NPH, Morganti R, Janssen RMJ, Bicknell GV.   +6 more
europepmc   +1 more source

Narrow-Line Seyfert 1 Galaxies

, 2007
To appear in the proceedings of "The nuclear region, host galaxy and environment of AGN", E. Benitez, I. Cruz-Gonzalez & Y.
openaire   +3 more sources

Anomalous Narrow Line Seyfert I Galaxies from SDSS DR17

The Astrophysical Journal
We present an analysis of 22,656 narrow-line Seyfert 1 galaxies (NLSy1s) from the Sloan Digital Sky Survey (SDSS) DR17 (0.1 ≤ z ≤ 0.9), identifying a sample of spectroscopically anomalous sources.
Arihant Tiwari, Rachana, M. Vivek, Suvendu Rakshit   +3 more
doaj   +1 more source

An automated activity classification tool for optical galaxy spectra

Astronomy & Astrophysics
Context. Reliable and versatile galaxy activity diagnostic tools are indispensable for comprehending the physical processes that drive galaxy evolution.
Daoutis C., Zezas A., Kyritsis E., Kouroumpatzakis K., Bonfini P.   +4 more
doaj   +1 more source

The SRG/eROSITA all-sky survey: Hard X-ray selected active galactic nuclei

Astronomy & Astrophysics
Context. The eROSITA instrument on board the Spectrum Roentgen Gamma (SRG) satellite performed its first all-sky survey between December 2019 and June 2020.
Waddell S. G. H., Buchner J., Nandra K., Salvato M., Merloni A., Gauger I., Boller Th., Seppi R., Wolf J., Liu T., Brusa M., Comparat J., Dwelly T., Igo Z., Musiimenta B.   +14 more
doaj   +1 more source