THE FUNDAMENTAL PLANE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI [PDF]
, 2016 Pu Du +5 more
openalex +1 more source
The Astrophysical Journal LettersThe high-energy-peaked BL Lacertae objects (HBLs) are the main targets of the Imaging X-ray Polarimetry Explorer (IXPE) for investigating the mechanisms of radiation and particle acceleration in jets. In this Letter, we report the first IXPE observations
Xin-Ke Hu +7 more
doaj +1 more source
The optical/near-infrared broad-line emission and hard X-ray continuum of active galactic nuclei and ultraluminous infrared galaxies [PDF]
, 1999 Masatoshi Imanishi, Shiro Ueno
openalex +1 more source
A Long-term Study of Mrk 50: Appearance and Disappearance of Soft Excess
The Astrophysical JournalWe present an extensive temporal and spectral study of the Seyfert 1 AGN Mrk 50 using 15 yr (2007–2022) of multiwavelength observations from XMM-Newton, Swift, and NuSTAR for the first time.
Narendranath Layek +3 more
doaj +1 more source
THE DIFFERENCES IN THE TORUS GEOMETRY BETWEEN HIDDEN AND NON-HIDDEN BROAD LINE ACTIVE GALACTIC NUCLEI [PDF]
, 2015 Kohei Ichikawa +15 more
openalex +1 more source
On the two states of CYG X-1 and related sources [PDF]
A model for active galactic nuclei (AGN), employing quasi-spherical accretion onto a black hole, when scaled down to solar mass objects, provides a straightforward account of the bimodal spectral behavior of Cyg X-1 and the other galactic black hole ...
Kazanas, D.
core +1 more source
Discovery of Changing-look Behavior in AGN NGC 3822: A Long-term Multiwavelength Study
The Astrophysical JournalWe present a comprehensive long-term multiwavelength study of the active galactic nucleus NGC 3822, based on 17 yr (2008–2025) of X-ray, ultraviolet (UV), and optical observations. The data set includes observations from Swift , XMM - Newton, and NuSTAR,
Narendranath Layek +9 more
doaj +1 more source
The collisional acceleration of relativistic electrons in the central regions of active galactic nuclei [PDF]
, 1991 Matthew G. Baring
openalex +1 more source
A Systematic Search for Active Galactic Nuclei Obscuration Variability in the Chandra Archive
The Astrophysical JournalThe nature of the obscuring material in active galactic nuclei (AGN) can be studied by measuring changes in the line-of-sight column density, N _H,LOS , over time. This can be accomplished by monitoring AGN over long periods of time and at all timescales.
Isaiah S. Cox +7 more
doaj +1 more source
The environment of active galactic nuclei – I. A two-component broad emission line model [PDF]
, 1988 S. Collin-Souffrin +3 more
openalex +1 more source