Results 161 to 170 of about 50,208 (269)

X-ray bright active galactic nuclei in massive galaxy clusters – I. Number counts and spatial distribution [PDF]

, 2012
Steven R. Ehlert, S. W. Allen, W. N. Brandt, Yongquan Xue, Bin Luo, Anja von der Linden, A. Mantz, R. Glenn Morris   +7 more
openalex   +1 more source

X-ray reverberation in Active Galactic Nuclei

, 2016
Narrow Line Type-1 Seyfert active galaxies can exhibit a high degree of variability in the X-ray regime. This thesis examines that variability in the context of reverberation models, in which a flare in activity has an extended, energy dependent, response. A novel method is developed for estimating the response function in different energy bands.
openaire   +1 more source

The Hard X-Ray Sky: Recent Observational Progress [PDF]

The last fifty years have witnessed the birth, development, and maturation to full potential of hard X-ray astrophysics. The primary force driving the history of the field has been the development of space-based instrumentation optimized for getting the ...
Cannizzo, John K., Gehrels, Neil
core   +1 more source

Infrared colours and spectral energy distributions of hard X-ray selected obscured and Compton-thick active galactic nuclei [PDF]

, 2020
Ece Kilerci, Tomotsugu Goto, Tolga Güver, Aysun Kara Tuncer, O H Ataş   +4 more
openalex   +1 more source

Extragalactic Science with the Orbiting Astronomical Satellite Investigating Stellar Systems (OASIS) Observatory. [PDF]

Space Sci Rev, 2023
Aalto S, Battersby C, Chin G, Hunt LK, Rigopoulou D, Stark AA, Viti S, Walker CK.   +7 more
europepmc   +1 more source

The Luminosity Function of X‐Ray–selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift [PDF]

, 2008
J. D. Silverman, Paul Green, Wayne Barkhouse, D.‐W. Kim, Minsun Kim, B. J. Wilkes, R. A. Cameron, G. Hasinger, Buell T. Jannuzi, M. G. Smith, Paul S. Smith, H. Tananbaum   +11 more
openalex   +1 more source

Intrinsic disc emission and the soft X-ray excess in active galactic nuclei [PDF]

, 2012
Chris Done, Shane W. Davis, Chichuan Jin, Omer Blaes, M. J. Ward   +4 more
openalex   +1 more source

X-Ray Coronal Properties of Swift/BAT-selected Seyfert 1 Active Galactic Nuclei

, 2022
Nikita Kamraj, Murray Brightman, Fiona A. Harrison, Daniel Stern, Javier A. García, Mislav Baloković, Cláudio Ricci, Michael Koss, Julián E. Mejía-Restrepo, Kyuseok Oh, Meredith C. Powell, C. M. Urry   +11 more
openalex   +1 more source

The average soft X-ray spectra of eROSITA active galactic nuclei

Shi-Jiang Chen, Johannes Büchner, Teng Liu, Scott Hagen, Sophia G. H. Waddell, K. Nandra, M. Salvato, Zsofi Igo, Catarina Aydar, A. Merloni, Qingling Ni, Jia-Lai Kang, Zhen-Yi Cai, Junxian Wang, Ruancun Li, M. E. Ramos-Ceja, J. S. Sanders, A. Georgakakis, Yi Zhang   +18 more
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Exploring the active galactic nuclei population with extreme X-ray-to-optical flux ratios (fx/fo > 50) [PDF]

, 2015
R. Della Ceca, F. J. Carrera, A. Caccianiga, P. Severgnini, L. Ballo, V. Braito, A. Corral, A. Del Moro, S. Mateos, A. Ruiz, M. G. Watson   +10 more
openalex   +1 more source