Results 111 to 120 of about 50,261 (220)

NuSTAR Detection of an Absorption Feature in ESP 39607: Evidence for an Ultrafast Inflow?

The Astrophysical Journal
We report the serendipitous discovery of an absorption feature at 4.8 keV in the NuSTAR spectra of ESP 39607, a Seyfert 2 galaxy at z = 0.201, observed in 2023 May and 2024 August. The feature is detected in both observations with individual significance
Alessandro Peca, Michael J. Koss, Roberto Serafinelli, Claudio Ricci, C. Megan Urry, Giulia Cerini, Peter G. Boorman   +6 more
doaj   +1 more source

Ensemble spectral variability study of Active Galactic Nuclei from the XMM-Newton serendipitous source catalogue

, 2016
The variability of the X-ray spectra of active galactic nuclei (AGN) usually includes a change of the spectral slope. This has been investigated for a small sample of local AGNs by Sobolewska and Papadakis, who found that slope variations are well ...
Middei, Riccardo, Serafinelli, Roberto, Vagnetti, Fausto   +2 more
core   +1 more source

Stripe 82-XL: The ∼54.8 deg2 and ∼18.8 Ms Chandra and XMM-Newton Point-source Catalog and Number of Counts

The Astrophysical Journal
We present an enhanced version of the publicly available Stripe 82X catalog (S82-XL), featuring a comprehensive set of 22,737 unique X-ray point sources identified with a significance ≳4 σ .
Alessandro Peca, Nico Cappelluti, Stephanie LaMassa, C. Megan Urry, Massimo Moscetti, Stefano Marchesi, David Sanders, Connor Auge, Aritra Ghosh, Tonima Tasnim Ananna, Núria Torres-Albà, Ezequiel Treister   +11 more
doaj   +1 more source

Origin of ultra-high energy cosmic rays in the era of Auger and Telescope Array

, 2008
The origin of ultra-high energy cosmic rays is discussed in light of the latest observational results from the Pierre Auger Observatory, highlighting potential astrophysical sources such as active galactic nuclei, gamma-ray bursts, and clusters of ...
Inoue, Susumu
core   +1 more source

First X-Ray Polarimetric View of a Low-luminosity Active Galactic Nucleus: The Case of NGC 2110

The Astrophysical Journal
Low-luminosity active galactic nuclei (LLAGN) provide a unique view of Comptonization and nonthermal emission from accreting black holes in the low accretion rate regime.
Sudip Chakraborty, Ajay Ratheesh, Daniele Tagliacozzo, Philip Kaaret, Jakub Podgorný, Frédéric Marin, Francesco Tombesi, Steven R. Ehlert, Chien-Ting J. Chen, Dawoon E. Kim, Ioannis Liodakis, Francesco Ursini, Riccardo Middei, Alessandro Di Marco, Fabio La Monaca, Srimanta Banerjee, Keigo Fukumura, W. Peter Maksym, Romana Mikušincová, Rodrigo Nemmen, Pierre-Olivier Petrucci, Paolo Soffitta, Jiří Svoboda, Wenda Zhang   +23 more
doaj   +1 more source

ABSTRACTS

Precision Radiation Oncology, EarlyView.
wiley   +1 more source

X-ray properties of Red Active Galactic Nuclei

, 2001
The Two Micron All Sky Survey (2MASS) is finding previously unidentified, luminous red active galactic nuclei (AGN). This new sample has a space density similar to, or greater than, previously known AGN, suggesting that a large fraction of the overall population has been missed. Chandra observations of a well-defined subset of these objects reveal that
Wilkes, Belinda J., Schmidt, Gary D., Cutri, Roc M., Ghosh, Himel, Hines, Dean C., Nelson, Brant, Smith, Paul   +6 more
openaire   +2 more sources

XRISM/Resolve Reveals the Complex Iron Structure of NGC 7213: Evidence for Radial Stratification between Inner Disk and Broad-line Region

The Astrophysical Journal Letters
We present the first high-resolution X-ray spectrum of NGC 7213 obtained with XRISM/Resolve, supported by simultaneous XMM-Newton, NuSTAR, and SOAR optical data.
E. Kammoun, T. Kawamuro, K. Murakami, S. Bianchi, F. Nicastro, A. Luminari, E. Aydi, M. Eracleous, O. K. Adegoke, E. Bertola, P. G. Boorman, V. Braito, G. Bruni, A. Comastri, P. Condò, M. Dadina, T. Enoto, J. A. García, V. E. Gianolli, F. A. Harrison, G. Lanzuisi, M. Laurenti, A. Marinucci, G. Mastroserio, H. Matsumoto, G. Matt, G. Matzeu, R. Middei, E. Nardini, H. Noda, H. Odaka, S. Ogawa, F. Panessa, E. Piconcelli, C. Pinto, J. M. Piotrowska, G. Ponti, C. Ricci, R. Ricci, R. Serafinelli, F. Shi, D. Stern, A. Tanimoto, Y. Terashima, R. Tomaru, F. Tombesi, A. Tortosa, Y. Ueda, F. Ursini, C. Vignali, S. Yamada, S. Yamada   +51 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

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