Results 111 to 120 of about 80,128 (249)

THE DIFFERENCES IN THE TORUS GEOMETRY BETWEEN HIDDEN AND NON-HIDDEN BROAD LINE ACTIVE GALACTIC NUCLEI [PDF]

, 2015
Kohei Ichikawa, C. Packham, C. Ramos Almeida, A. Asensio Ramos, A. Alonso‐Herrero, O. González-Martín, Enrique López-Rodríguez, Yoshihiro Ueda, T. Díaz-Santos, Moshe Elitzur, S. F. Hönig, Masatoshi Imanishi, N. A. Levenson, Rachel Mason, Eric S. Perlman, Crystal D. Alsip   +15 more
openalex   +1 more source

ABSTRACTS

Precision Radiation Oncology, EarlyView.
wiley   +1 more source

A Long-term Study of Mrk 50: Appearance and Disappearance of Soft Excess

The Astrophysical Journal
We 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, Prantik Nandi, Sachindra Naik, Arghajit Jana   +3 more
doaj   +1 more source

On the Extended Soft X-Ray and Fe Kα Emission in NGC 1068

The Astrophysical Journal
The soft X-ray excess and Fe K α emission lines are widely observed in Seyfert galaxies, with their origin still in debate. We present a detailed spatially resolved image and spectral analysis of the Seyfert 2 galaxy NGC 1068 using high-resolution ...
Songbo Gao, Hongxing Yin, Shaoming Hu
doaj   +1 more source

A Search for Short‐Timescale Microvariability in Active Galactic Nuclei in the Ultraviolet [PDF]

, 2004
Joseph F. Dolan, L. Lee Clark
openalex   +1 more source

Discovery of Changing-look Behavior in AGN NGC 3822: A Long-term Multiwavelength Study

The Astrophysical Journal
We 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, Prantik Nandi, Sachindra Naik, Birendra Chhotaray, Arghajit Jana, Priyadarshee P. Dash, Neeraj Kumari, C. S. Stalin, Srikanth Bandari, S. Muneer   +9 more
doaj   +1 more source

DUSTY STRUCTURE AROUND TYPE-I ACTIVE GALACTIC NUCLEI: CLUMPY TORUS NARROW-LINE REGION AND NEAR-NUCLEUS HOT DUST [PDF]

, 2009
Rivay Mor, Hagai Netzer, Moshe Elitzur
openalex   +1 more source

A Systematic Search for Active Galactic Nuclei Obscuration Variability in the Chandra Archive

The Astrophysical Journal
The 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, Núria Torres-Albà, Stefano Marchesi, Vittoria E. Gianolli, Xiurui Zhao, Marco Ajello, Indrani Pal, Ross Silver   +7 more
doaj   +1 more source

"Fermi" bubbles are bursting from our galaxy. Their origins remain a mystery. [PDF]

Proc Natl Acad Sci U S A, 2023
Mann A.
europepmc   +1 more source

An Excess of Active Galactic Nuclei Triggered by Galaxy Mergers in MaNGA Galaxies of Stellar Mass ∼1011 M ⊙

The Astrophysical Journal
To facilitate new studies of galaxy-merger-driven fueling of active galactic nuclei (AGNs), we present a catalog of 387 AGNs that we have identified in the final population of over 10,000 z < 0.15 galaxies observed by the Sloan Digital Sky Survey-IV ...
Julia M. Comerford, Rebecca Nevin, James Negus, R. Scott Barrows, Michael Eracleous, Francisco Müller-Sánchez, Namrata Roy, Aaron Stemo, Thaisa Storchi-Bergmann, Dominika Wylezalek   +9 more
doaj   +1 more source