Results 131 to 140 of about 9,238,867 (222)

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

On the Extremely X-Ray Variable Active Galactic Nuclei in the XMM-LSS Field

The Astrophysical Journal
We present a systematic investigation of extremely X-ray variable active galactic nuclei (AGNs) in the ≈5.3 deg ^2 XMM-SERVS XMM-LSS region. Eight variable AGNs are identified with rest-frame 2 keV flux density variability amplitudes around 6–12.
Zijian Zhang, Bin Luo, Linhua Jiang, W. N. Brandt, Jian Huang, Qingling Ni   +5 more
doaj   +1 more source

Disk Reflection as the Origin of the X-Ray Polarization of NGC4151 with IXPE

The Astrophysical Journal
We present an X-ray spectropolarimetric study of the nearby type 1 active galactic nucleus NGC 4151 using two long IXPE observations obtained in 2022 and 2024, supported by simultaneous XMM-Newton and NuSTAR spectroscopy.
E. Kammoun, M. Dovčiak, J. Podgorný, I. E. Papadakis, V. Binas-Valavanis, S. Bianchi, V. E. Gianolli, F. Ursini, J. A. García   +8 more
doaj   +1 more source

First Evidence for a Quasiperiodic Oscillation Triplet and Its Relativistic Precession Origin in RE J1034+396

The Astrophysical Journal
Quasiperiodic oscillations (QPOs) in active galactic nuclei (AGNs) provide a powerful tool for probing the structure of the innermost accretion flow and corona around supermassive black holes.
Ruisong Xia, Yongquan Xue, Jialai Wang, Hao Liu   +3 more
doaj   +1 more source

XRISM Spectroscopy of Accretion-driven Wind Feedback in NGC 4151

The Astrophysical Journal Letters
The hottest, most ionized, and fastest winds driven by accretion onto massive black holes have the potential to reshape their host galaxies. Calorimeter-resolution X-ray spectroscopy is the ideal tool to understand this feedback mode, as it enables ...
Xin Xiang, Jon M. Miller, Ehud Behar, Rozenn Boissay-Malaquin, Laura Brenneman, Margaret Buhariwalla, Doyee Byun, Chris Done, Luigi Gallo, Dimitra Gerolymatou, Scott Hagen, Jelle Kaastra, Stephane Paltani, Frederick S. Porter, Richard Mushotzky, Hirofumi Noda, Missagh Mehdipour, Takeo Minezaki, Makoto Tashiro, Abderahmen Zoghbi   +19 more
doaj   +1 more source

X-ray detections of submillimetre galaxies: active galactic nuclei versus starburst contribution

, 2013
We present a large-scale study of the X-ray properties and near-IR-to-radio spectral energy distributions (SEDs) of submillimetre galaxies (SMGs) detected at 1.1 mm with the AzTEC instrument across a ∼1.2 square degree area of the sky. Combining deep 2–4
Itziar Aretxaga, David Hughes
core  

In the Eye of the Storm: The Third Giant X-Ray Outburst of the Extreme Changing-look AGN IC 3599

The Astrophysical Journal Letters
We report the discovery and multiwavelength follow-up observations of a giant (factor >100) X-ray outburst of the exceptional changing-look active galactic nucleus (AGN) IC 3599.
D. Grupe, S. Komossa, W. Zheng, A. V. Filippenko, T. G. Brink, N. Schartel, J. Wang, V. Oknyansky, A. V. Dodin, S. Wolsing, E. Elien, C. Tapper, P. Lynam   +12 more
doaj   +1 more source

Black hole masses and Doppler factors of gamma-ray active galactic nuclei

, 2004
The sizes of the broad-line regions (BLRs) in gamma-ray active galactic nuclei (AGNs) are estimated from their optical continuum luminosity by using the empirical relation between R-BLR and L-lambda,L-opt.
Fan, ZH, Cao, XW
core  

Redshifted Iron Emission and Absorption Lines in the Chandra X-Ray Spectrum of Centaurus A

The Astrophysical Journal
Cen A hosts the closest active galactic nucleus to the Milky Way, which makes it an ideal target for investigating the dynamical processes in the vicinity of accreting supermassive black holes.
David Bogensberger, Jon Miller, Elias Kammoun, Richard Mushotzky, Laura Brenneman, W. N. Brandt, Edward M. Cackett, Andrew Fabian, Jelle Kaastra, Shashank Dattathri, Ehud Behar, Abderahmen Zoghbi   +11 more
doaj   +1 more source

Active galactic nuclei and X-ray observations [PDF]

Journal of Physical Studies, 2016
A. A. Vasylenko, V. I. Zhdanov, E. V. Fedorova   +2 more
openaire   +1 more source