Results 191 to 200 of about 289,816 (297)

A Deeper Look into eFEDS AGN Candidates in Dwarf Galaxies with Chandra

The Astrophysical Journal
The ability to accurately discern active massive black holes (BHs) in nearby dwarf galaxies is paramount to understanding the origins and processes of “seed” BHs in the early Universe.
Adonis A. Sanchez, Amy E. Reines, Ákos Bogdán, Ralph P. Kraft   +3 more
doaj   +1 more source

Testing a model of variability of X-ray reprocessing features in active galactic nuclei [PDF]

, 2001
P. T. Życki, A. Roza ska
openalex   +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

KISS Active Galactic Nuclei in the Soft X-Ray Band: Correlation with the [ITAL]ROSAT[/ITAL] All-Sky Survey [PDF]

, 2002
Samantha L. Stevenson, John J. Salzer, Vicki L. Sarajedini, Edward C. Moran   +3 more
openalex   +1 more source

Very High Redshift X-Ray–selected Active Galactic Nuclei in the Chandra Deep Field–North [PDF]

, 2003
A. J. Barger, L. L. Cowie, P. Capak, D. M. Alexander, F. E. Bauer, W. N. Brandt, G. P. Garmire, A. E. Hornschemeier   +7 more
openalex   +1 more source

X-ray spectra and time variability of active galactic nuclei [PDF]

The X-ray spectra of broad line active galactic nuclei (AGN) of all types (Seyfert I's, NELG's, broadline radio galaxies) are well fit by a power law in the .5 to 100 keV band of man energy slope alpha = .68 + or - .15.
Mushotzky, R. F.
core   +1 more source

A New Interpretation for the Hot Corona in Active Galactic Nuclei

The Astrophysical Journal
This work attempts to provide a new interpretation for the hot corona in active galactic nuclei (AGNs). A thin parabolic magnetic reconnection layer, anchored at the innermost disk and extending along the boundary of the magnetic tower for a few tens of ...
Yu Zhao, Yan-Rong Li, Jian-Min Wang
doaj   +1 more source

X-ray Constraints on Wandering Black Holes in Stripped Galaxy Nuclei in the Halo of NGC 5128 [PDF]

arXiv
A subset of galaxies have dense nuclei, and when these galaxies are accreted and tidally stripped, the nuclei can masquerade as globular clusters in the halos of large galaxies. If these nuclei contain massive central black holes, some may accrete gas and become observable as active galactic nuclei.
arxiv  

Obscured active galactic nuclei from the ELAIS Deep X-ray Survey [PDF]

, 2003
Chris J. Willott, C. Simpson, O. Almaini, James Manners, O. Johnson, A. Lawrence, J. S. Dunlop, R. J. Ivison, Steve Rawlings, E. González-Solares, I. Pérez-Fournón, S. Serjeant, Seb Oliver, N. Roche, R. G. Mann, M. Rowan‐Robinson   +15 more
openalex   +1 more source

Swift-XRT and NuSTAR Monitoring of Obscuration Variability in Mrk 477

The Astrophysical Journal
We present the analysis of 15 X-ray observations of Mrk 477, a nearby Seyfert 2 active galactic nucleus, with the objective to monitor its obscuring column density variability.
N. Torres-Albà, Z. Hu, I. Cox, S. Marchesi, M. Ajello, A. Pizzetti, I. Pal, R. Silver, X. Zhao   +8 more
doaj   +1 more source