Results 111 to 120 of about 1,919 (235)

The X-Ray Luminosity Function of Active Galactic Nuclei

, 1999
We derive an X-ray luminosity function for active galactic nuclei (AGN) that accounts for the X-ray source counts in the 0.5-2.0 and 2-10 keV energy ranges, the redshift distribution of AGNs in the ROSAT Deep Survey (RDS), as well as the X-ray background (XRB) from 1-10 keV.
Schmidt, M., Giacconi, R., Hasinger, G., Truemper, J., Zamorani, G.   +4 more
openaire   +2 more sources

X-Ray Constraints on Wandering Black Holes in Stripped Galaxy Nuclei in the Halo of NGC 5128

The Astrophysical Journal
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.
Samuel L. Feyan, Ryan Urquhart, Jay Strader, Anil C. Seth, David J. Sand, Nelson Caldwell, Denija Crnojević, Antoine Dumont, Karina Voggel   +8 more
doaj   +1 more source

Cosmic ray feedback in galaxies and galaxy clusters: A pedagogical introduction and a topical review of the acceleration, transport, observables, and dynamical impact of cosmic rays. [PDF]

Astron Astrophys Rev, 2023
Ruszkowski M, Pfrommer C.
europepmc   +1 more source

X/γ-rays from Active Galactic Nuclei [PDF]

, 2000
Roger Svensson
openalex   +1 more source

Connecting the X-Ray/UV Variability of Fairall 9 with NICER: A Possible Warm Corona

The Astrophysical Journal
The Seyfert 1 active galactic nucleus Fairall 9 was targeted by NICER, Swift, and ground-based observatories for a ∼1000 day long reverberation mapping campaign.
Ethan R. Partington, Edward M. Cackett, Rick Edelson, Keith Horne, Jonathan Gelbord, Erin Kara, Christian Malacaria, Jake A. Miller, James F. Steiner, Andrea Sanna   +9 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

ABSTRACTS

Precision Radiation Oncology, EarlyView.
wiley   +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

Hydrogen Column Density Variability in a Sample of Local Compton-thin AGN II

The Astrophysical Journal
We present the multiepoch analysis of 13 variable, nearby ( z ≲ 0.1), and Compton-thin (10 ^22 < N _H < 1.5 × 10 ^24 cm ^−2 ) active galactic nuclei (AGN) selected from the 105-month BAT catalog.
A. Pizzetti, N. Torres-Albà, S. Marchesi, J. Buchner, I. Cox, X. Zhao, S. Neal, D. Sengupta, R. Silver, M. Ajello   +9 more
doaj   +1 more source