Results 101 to 110 of about 50,208 (269)

X-raying the Winds of Luminous Active Galaxies

, 2009
We briefly describe some recent observational results, mainly at X-ray wavelengths, on the winds of luminous active galactic nuclei (AGNs). These winds likely play a significant role in galaxy feedback.
Brandt, W. N., Chartas, G., Gallagher, S. C., Gibson, R. R., Miller, B. P.   +4 more
core   +1 more source

On the Extended Soft X-Ray and Fe Kα Emission in NGC 1068

The Astrophysical Journal
The soft X-ray excess and Fe K α emission lines are widely observed in Seyfert galaxies, with their origin still in debate. We present a detailed spatially resolved image and spectral analysis of the Seyfert 2 galaxy NGC 1068 using high-resolution ...
Songbo Gao, Hongxing Yin, Shaoming Hu
doaj   +1 more source

X-ray astronomical spectroscopy [PDF]

The current status of the X-ray spectroscopy of celestial X-ray sources, ranging from nearby stars to distant quasars, is reviewed. Particular emphasis is placed on the role of such spectroscopy as a useful and unique tool in the elucidation of the ...
Holt, S. S.
core   +1 more source

Discovery of Changing-look Behavior in AGN NGC 3822: A Long-term Multiwavelength Study

The Astrophysical Journal
We present a comprehensive long-term multiwavelength study of the active galactic nucleus NGC 3822, based on 17 yr (2008–2025) of X-ray, ultraviolet (UV), and optical observations. The data set includes observations from Swift , XMM - Newton, and NuSTAR,
Narendranath Layek, Prantik Nandi, Sachindra Naik, Birendra Chhotaray, Arghajit Jana, Priyadarshee P. Dash, Neeraj Kumari, C. S. Stalin, Srikanth Bandari, S. Muneer   +9 more
doaj   +1 more source

Demography of obscured and unobscured AGN: prospects for a Wide Field X-ray Telescope

, 2010
We discuss some of the main open issues in the evolution of Active Galactic Nuclei which can be solved by the sensitive, wide area surveys to be performed by the proposed Wide Field X-ray Telescope mission.Comment: Proceedings of "The Wide Field X-ray ...
A. Comastri, C. Vignali, E. Lusso, F. Marulli, M. Brusa, P. Rosati, P. Tozzi, PAOLILLO, MAURIZIO, R. Gilli, S. Borgani, the WFXT team   +10 more
core  

Force Multiplier Calculations for X-ray Binaries and Active Galactic Nuclei

, 2018
Motivated by the work done to explore the winds from hot stars (Lamers & Cassinelli 1999), we develop a method for self consistently calculating force multipliers for Type 1 and Type 2 active galactic nuclei (AGN), soft and hard start X-ray binaries ...
Dannen, Randall Cody
core   +1 more source

Active galactic nuclei with ultrasoft X-ray emission

The Astrophysical Journal Supplement Series, 1992
The discovery of a class of AGN with clearly distinguishable soft X-ray components below 0.5 keV is reported. These AGN were detected through equivalent hydrogen column densities that are less than a few times 10 exp 20/sq cm. At least three kinds of AGN comprise this sample: low-redshift quasars and Seyfert galaxies that have only ultrasoft emission ...
F. A. Cordova, J. F. Kartje, R. J., Jr. Thompson, K. O. Mason, E. M. Puchnarewicz, F. R., Jr. Harnden   +5 more
openaire   +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

INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources

, 2010
This paper is the second in a series devoted to the hard X-ray (17-60 keV) whole sky survey performed by the INTEGRAL observatory over seven years. Here we present a catalog of detected sources which includes 521 objects, 449 of which exceed a 5 sigma ...
Abdo, Ajello, Aleksandrovich, Altamirano, Augello, Barlow, Barlow, Barthelmy, Bassa, Bassani, Bassani, Bassani, Bassani, Bazzano, Beckmann, Beckmann, Bikmaev, Bikmaev, Bikmaev, Bikmaev, Bird, Bird, Bird, Bird, Bodaghee, Brandt, Brandt, Brandt, Brandt, Brunschweiger, Burenin, Burenin, Burenin, Burenin, Burenin, Butler, Butters, Bykov, Bykov, Bélanger, Cackett, Cadol le Bel, Chaty, Chelovekov, Chelovekov, Chelovekov, Chelovekov, Chernyakova, Chernyakova, Chernyakova, Cornelisse, Courvoisier, Crawford, Cusumano, Dean, Den Hartog, den Hartog, den Hartog, Donato, E. Churazov, Enya, Fiocchi, Fisher, Galloway, Gehrels, Gotz, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Gros, Gänsicke, Halpern, Hannikainen, Im, in ’t Zand, in ’t Zand, Jauncey, Karasev, Karasev, Keek, Kniazev, Kniazev, Kretschmar, Krivonos, Krivonos, Krivonos, Krivonos, Krivonos, Krivonos, Kuiper, Kuiper, Kuiper, Kuiper, Kuulkers, Kuulkers, Landi, Landi, Landi, Landi, Leyder, Liu, Liu, Lubinski, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, M. Revnivtsev, Malizia, Malizia, Markwardt, Markwardt, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Mescheryakov, Molkov, Molkov, Molkov, Morelli, Negueruela, Negueruela, Nespoli, Paizis, Palmer, Parisi, Patel, Pavlinskii, Potter, Produit, R. Krivonos, R. Sunyaev, Ratti, Rea, Reig, Reig, Renaud, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Rodriguez, Rodriguez, Rodriguez, Rodriguez, Rodriguez, S. Grebenev, S. Tsygankov, Sazonov, Sazonov, Sazonov, Sguera, Sguera, Sidoli, Smith, Soldi, Soldi, Steeghs, Sunyaev, Sunyaev, Sunyaev, Terrier, Tomsick, Tomsick, Tomsick, Tomsick, Tomsick, Tomsick, Torrejón, Torres, Torres, Tueller, Tueller, Turler, Ubertini, Ubertini, Walter, Walter, Watson, Wijnands, Winkler, Winter, Zhou, Zurita Heras   +220 more
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