X-Ray Polarization Variability of High Spectral Peak BL Lacertaes: Cases of 1ES 1959+650 and PKS 2155–304 by Xin-Ke Hu, Yu-Wei Yu, Jin Zhang, Tan-Zheng Wu, Ji-Shun Lian, Xiang-Gao Wang, Hai-Ming Zhang, En-Wei Liang

Subjects: “…Active galactic nuclei…”
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A Reemerging Bright Soft X-Ray State of the Changing-look Active Galactic Nucleus 1ES 1927+654: A Multiwavelength View by Ritesh Ghosh, Sibasish Laha, Eileen Meyer, Agniva Roychowdhury, Xiaolong Yang, J. A. Acosta–Pulido, Suvendu Rakshit, Shivangi Pandey, Josefa Becerra González, Ehud Behar, Luigi C. Gallo, Francesca Panessa, Stefano Bianchi, Fabio La Franca, Nicolas Scepi, Mitchell C. Begelman, Anna Lia Longinotti, Elisabeta Lusso, Samantha Oates, Matt Nicholl, S. Bradley Cenko, Brendan O’Connor, Erica Hammerstein, Jincen Jose, Krisztina Éva Gabányi, Federica Ricci, Sabyasachi Chattopadhyay

Subjects: “…Active galactic nuclei…”
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AMUSE-Antlia. I. Nuclear X-Ray Properties of Early-type Galaxies in a Dynamically Young Galaxy Cluster by Zhensong Hu, Yuanyuan Su, Zhiyuan Li, Kelley M. Hess, Ralph P. Kraft, William R. Forman, Paul E. J. Nulsen, Sarrvesh S. Sridhar, Andra Stroe, Junhyun Baek, Aeree Chung, Dirk Grupe, Hao Chen, Jimmy A. Irwin, Christine Jones, Scott W. Randall, Elke Roediger

Subjects: “…X-ray active galactic nuclei…”
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Narrow Fe–Kα Reverberation Mapping Unveils the Deactivated Broad-line Region in a Changing-look Active Galactic Nucleus by Hirofumi Noda, Taisei Mineta, Takeo Minezaki, Hiroaki Sameshima, Mitsuru Kokubo, Taiki Kawamuro, Satoshi Yamada, Takashi Horiuchi, Hironori Matsumoto, Makoto Watanabe, Kumiko Morihana, Yoichi Itoh, Koji S. Kawabata, Yasushi Fukazawa

Subjects: “…X-ray active galactic nuclei…”
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A Simple Method for Predicting N H Variability in Active Galactic Nuclei by Isaiah S. Cox, Núria Torres-Albà, Stefano Marchesi, Xiurui Zhao, Marco Ajello, Andrealuna Pizzetti, Ross Silver

Subjects: “…X-ray active galactic nuclei…”
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The Structure Function of Mid-infrared Variability in Low-redshift Active Galactic Nuclei by Suyeon Son, Minjin Kim, Luis C. Ho

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A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei by Luigi Foschini, Matthew L. Lister, Heinz Andernach, Stefano Ciroi, Paola Marziani, Sonia Antón, Marco Berton, Elena Dalla Bontà, Emilia Järvelä, Maria J. M. Marchã, Patrizia Romano, Merja Tornikoski, Stefano Vercellone, Amelia Vietri

“…We considered the fourth catalog of gamma-ray point sources produced by the <i>Fermi</i> Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. …”
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Active Galactic Nuclei as Potential Sources of Ultra-High Energy Cosmic Rays by Frank M. Rieger

“…Active Galactic Nuclei (AGNs) and their relativistic jets belong to the most promising class of ultra-high-energy cosmic ray (UHECR) accelerators. …”
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How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured? by Xu-Fan Hu, Zhen-Yi Cai, Jun-Xian Wang

“…The variability of active galactic nuclei (AGNs) is ubiquitous, but has not yet been understood. …”
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A New Version of the Bibliography Catalog of VLBI Maps of Active Galactic Nuclei by Bychkova V., Gurvits L., Tsarevsky G.

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Inherent and Local Magnetic Field Structures in Jets from Active Galactic Nuclei by Denise C. Gabuzda

Subjects: “…active galactic nuclei…”
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A High Fraction of Heavily X-Ray-obscured Active Galactic Nuclei by Christopher M. Carroll, Tonima T. Ananna, Ryan C. Hickox, Alberto Masini, Roberto J. Assef, Daniel Stern, Chien-Ting J. Chen, Lauranne Lanz

Subjects: “…Active galactic nuclei…”
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Two-dimensional correlation analysis of periodicity in active galactic nuclei time series by Kovačević Andjelka B., Popović Luka Č., Ilić Dragana

“…The active galactic nuclei (AGN) are among the most powerful sources with an inherent, pronounced and random variation of brightness. …”
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Observable Signature of Merging Stellar-mass Black Holes in Active Galactic Nuclei by Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman, Rosalba Perna, Imre Bartos

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A New Photoionization Model of the Narrow-line Region in Active Galactic Nuclei by Peixin Zhu, Lisa J. Kewley, Ralph S. Sutherland

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Probing the Large Faraday Rotation Measure Environment of Compact Active Galactic Nuclei by Alice Pasetto, Carlos Carrasco-González, Shane O’Sullivan, Aritra Basu, Gabriele Bruni, Alex Kraus, Salvador Curiel, Karl-Heinz Mack

“…Knowing how the ambient medium in the vicinity of active galactic nuclei (AGNs) is shaped is crucial to understanding generally the evolution of such cosmic giants as well as AGN jet formation and launching. …”
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On measuring the Hubble constant with X-ray reverberation mapping of active galactic nuclei by Ingram, Adam, Mastroserio, Guglielmo, van der Klis, Michiel, Nathan, Edward, Connors, Riley, Dauser, Thomas, García, Javier A, Kara, Erin, König, Ole, Lucchini, Matteo, Wang, Jingyi

“…<jats:title>ABSTRACT</jats:title> <jats:p>We show that X-ray reverberation mapping can be used to measure the distance to type 1 active galactic nuclei (AGNs). This is because X-ray photons originally emitted from the ‘corona’ close to the black hole irradiate the accretion disc and are reemitted with a characteristic ‘reflection’ spectrum that includes a prominent ∼6.4 keV iron emission line. …”
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Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei by Collaboration, TPA

“…Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the positions of relatively nearby active galactic nuclei (AGN) \cite{science}. The correlation has maximum significance for cosmic rays with energy greater than ~ 6x10^{19}$ eV and AGN at a distance less than ~ 75 Mpc. …”

THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE by Abdo, A, Ackermann, M, Ajello, M, Allafort, A, Antolini, E, Atwood, W, Axelsson, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Baughman, B, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R, Bloom, E, Bogart, JR, Bonamente, E, Borgland, A, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P

“…We present the first catalog of active galactic nuclei (AGNs) detected by the Large Area Telescope (LAT), corresponding to 11 months of data collected in scientific operation mode. …”

Emission-line ratios in a radio-selected sample of active galactic nuclei by Simpson, C, Ward, M, Clements, D, Rawlings, S