Results 41 to 50 of about 63,914 (268)

Active Galactic Nuclei with High-Resolution X-Ray Spectroscopy

, 2023
Invited review chapter for the book High-Resolution X-Ray Spectroscopy: Instrumentation, Data Analysis, and Science (Eds. C. Bambi and J. Jiang, Springer Singapore, expected in 2023).
Gallo, Luigi C., Miller, Jon M., Costantini, Elisa   +2 more
openaire   +2 more sources

Heavy X‐Ray Absorption in Soft X‐Ray–weak Active Galactic Nuclei [PDF]

The Astrophysical Journal, 2001
30 pages, 10 figures, LaTeX, uses aaspp4.sty; submitted to ...
Gallagher, S. C., Brandt, W. N., Laor, A., Elvis, M., Mathur, S., Wills, Beverley J., Iyomoto, N.   +6 more
openaire   +2 more sources

Piecing together the X-ray background : bolometric corrections for active galactic nuclei [PDF]

, 2007
The X-ray background can be used to constrain the accretion history of supermassive black holes (SMBHs) in active galactic nuclei (AGN), with the SMBH mass density related to the energy density due to accretion.
R. Vasudevan, A. Fabian
semanticscholar   +1 more source

X-ray absorption in INTEGRAL active galactic nuclei [PDF]

Astronomy & Astrophysics, 2020
In this work the INTEGRAL hard X-ray selected sample of active galactic nuclei (AGN) has been used to investigate the possible contribution of absorbing material distributed within the host galaxies to the total amount of NH measured in the X-ray band. We collected all the available axial ratio measurements of the galaxies hosting our AGN together with
A. Malizia, L. Bassani, J. B. Stephen, A. Bazzano, P. Ubertini   +4 more
openaire   +1 more source

RefleX: X-ray absorption and reflection in active galactic nuclei for arbitrary geometries [PDF]

, 2019
Reprocessed X-ray radiation carries important information about the structure and physical characteristics of the material surrounding the supermassive black hole (SMBH) in active galactic nuclei (AGN).
S. Paltani, C. Ricci
semanticscholar   +1 more source

X-ray variability of 104 active galactic nuclei [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractWe have performed a uniform analysis of the power spectrum densities (PSDs) of 104 nearby (z<0.4) active galactic nuclei (AGN) using 209 XMM-Newton/pn observations, including several AGN classes. These PSDs span ≃ 3 decades in temporal frequencies, ranging from minutes to days.
O. González-Martín, S. Vaughan
openaire   +1 more source

The TANAMI Program [PDF]

, 2009
TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) is a monitoring program to study the parsec-scale structures and dynamics of relativistic jets in active galactic nuclei (AGN) of the Southern Hemisphere with the Long ...
Boeck, M., Booth, R., Dutka, M. S., Edwardsk, P., Fey, A. L., Fuhrmann, L., Hase, H., Horiuchi, S., Jauncey, D. L., Johnston, K. J., Kadler, Matthias, Katz, U., Lister, M., Lovell, J. E. J., Mueller, Cornelia, Ojha, Roopesh, Ploetz, C., Quick, J. F. H., Ros, E., Taylor, G. B., Thompson, D. J., Tingay, S. J., Tosti, G., Tzioumisk, A. K., Wilms, J., Zensus, J. A.   +25 more
core   +2 more sources

The Correlation between X-ray spectral slope and FeKalpha line energy in radio-quiet active galactic nuclei

, 2002
A significant correlation between FeKalpha line energy and X-ray spectral slope has been discovered among radio-quiet active galactic nuclei. The ionization stage of the bulk of the FeKalpha emitting material is not the same in all active galactic nuclei
Arnaud K. A., Boller T., Brandt W. N., Fabian A. C., George I. M., Grupe D., Guainazzi M., Guilbert P. W., Gulab Chand Dewangan, Koenig M., Mineo T., Pounds K. A., Reynolds C. S., Winkler H., Wisotzki L.   +14 more
core   +1 more source

A Hard Look at NGC 5347: Revealing a Nearby Compton-thick AGN [PDF]

, 2019
Current measurements show that the observed fraction of Compton-thick (CT) active galactic nuclei (AGN) is smaller than the expected values needed to explain the cosmic X-ray background. Prior fits to the X-ray spectrum of the nearby Seyfert-2 galaxy NGC
Barret, D., Behar, E., Brandt, W. N., Brenneman, L. W., Kaastra, J. S., Kammoun, E. S., Koss, M., Lohfink, A. M., Miller, J. M., Muchotzky, R. F., Oh, K., Proga, Daniel, Stern, D., Zoghbi, A.   +13 more
core   +6 more sources

The Contribution of Host Galaxy Properties in X-Ray Active Galactic Nuclei Clusters

American Journal of Astronomy and Astrophysics
In this study, the influence of host galaxy properties on X-ray active galactic nuclei (AGN) clusters was investigated using multiwavelength data. X-ray data from the eFEDS main catalog, optical and near-infrared data from the fourth data release of KiDS/
Gutu Mekonen, Anno Kare
semanticscholar   +1 more source