Search Results - "Madejski, Greg"

On the significance of relativistically hot pairs in the jets of FR II radio galaxies by Sikora, Marek, Nalewajko, Krzysztof, Madejski, Greg M

“…ABSTRACT The energetic composition of radio lobes in the FR II galaxies – estimated by comparing their radio luminosities with the powers required to inflate…”
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Comparison of hard X-ray spectra of luminous radio galaxies and their radio-quiet counterparts by Gupta, Maitrayee, Sikora, Marek, Rusinek, Katarzyna, Madejski, Greg M

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MERGER-DRIVEN FUELING OF ACTIVE GALACTIC NUCLEI: SIX DUAL AND OFFSET AGNs DISCOVERED WITH CHANDRA AND HUBBLE SPACE TELESCOPE OBSERVATIONS by Comerford, Julia M, Pooley, David, Barrows, R Scott, Greene, Jenny E, Zakamska, Nadia L, Madejski, Greg M, Cooper, Michael C

“…Dual active galactic nuclei (AGNs) and offset AGNs are kpc-scale separation supermassive black holes pairs created during galaxy mergers, where both or one of…”
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Gamma-Ray Observations of Active Galactic Nuclei by Madejski, Grzegorz (Greg), Sikora, Marek

“…This article reviews the recent observational results regarding γ-ray emission from active galaxies. The most numerous discrete extragalactic γ-ray sources are…”
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SYSTEMATIC STUDY OF GAMMA-RAY-BRIGHT BLAZARS WITH OPTICAL POLARIZATION AND GAMMA-RAY VARIABILITY by Itoh, Ryosuke, Nalewajko, Krzysztof, Fukazawa, Yasushi, Uemura, Makoto, Tanaka, Yasuyuki T., Kawabata, Koji S., Madejski, Greg M., Schinzel, Frank. K., Kanda, Yuka, Shiki, Kensei, Akitaya, Hiroshi, Kawabata, Miho, Moritani, Yuki, Nakaoka, Tatsuya, Ohsugi, Takashi, Sasada, Mahito, Takaki, Katsutoshi, Takata, Koji, Ui, Takahiro, Yamanaka, Masayuki, Yoshida, Michitoshi

“…ABSTRACT Blazars are highly variable active galactic nuclei that emit radiation at all wavelengths from radio to gamma rays. Polarized radiation from blazars…”
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Constraining Jet Production Scenarios by Studies of Narrow-Line-Radio-Galaxies by Sikora, Marek, Stasinska, Grazyna, Koziel-Wierzbowska, Dorota, Madejski, Greg M., Asari, Natalia V.

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DISCOVERY OF GeV EMISSION FROM THE CIRCINUS GALAXY WITH THE FERMI LARGE AREA TELESCOPE by Hayashida, Masaaki, Stawarz, Lukasz, Cheung, Chi C, Bechtol, Keith, Madejski, Greg M, Ajello, Marco, Massaro, Francesco, Moskalenko, Igor V, Strong, Andrew, TIBALDO, LUIGI

“…We report the discovery of gamma -ray emission from the Circinus galaxy using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope…”
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ON THE ORIGIN OF X-RAY SPECTRA IN LUMINOUS BLAZARS by Sikora, Marek, Janiak, Mateusz, NALEWAJKO, KRZYSZTOF, Madejski, Greg M, MODERSKI, RAFAL

“…Gamma-ray luminosities of some quasar-associated blazars imply jet powers reaching values comparable to the accretion power even if assuming very strong…”
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3C 454.3 REVEALS THE STRUCTURE AND PHYSICS OF ITS BLAZAR ZONE by SIKORA, Marek, MODERSKI, Rafal, MADEJSKI, Greg M

“…Recent multiwavelength observations of…”
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Constraining Emission Models of Luminous Blazar Sources by Sikora, Marek, Stawarz, Łukasz, Moderski, Rafał, Nalewajko, Krzysztof, Madejski, Greg M

“…Many luminous blazars which are associated with quasar-type active galactic nuclei display broadband spectra characterized by a large luminosity ratio of their…”
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ON THE ORIGIN OF THE γ-RAY/OPTICAL LAGS IN LUMINOUS BLAZARS by JANIAK, Mateusz, SIKORA, Marek, NALEWAJKO, Krzysztof, MODERSKI, Rafał, MADEJSKI, Greg M

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HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES by NALEWAJKO, Krzysztof, SIKORA, Marek, MADEJSKI, Greg M, EXTER, Katrina, SZOSTEK, Anna, SZCZERBA, Ryszard, KIDGER, Mark R, LORENTE, Rosario

“…We present the results of observations of blazar PKS 1510-089 with the Herschel Space Observatory PACS and SPIRE instruments, together with multiwavelength…”
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The high energy X-ray probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye by Lea Marcotulli, Lea Marcotulli, Marco Ajello, Markus Böttcher, Paolo Coppi, Luigi Costamante, Laura Di Gesu, Manel Errando, Javier A. García, Javier A. García, Andrea Gokus, Ioannis Liodakis, Ioannis Liodakis, Greg Madejski, Kristin Madsen, Alberto Moretti, Riccardo Middei, Riccardo Middei, Felicia McBride, Maria Petropoulou, Bindu Rani, Bindu Rani, Tullia Sbarrato, Daniel Stern, Georgios Vasilopoulos, Michael Zacharias, Michael Zacharias, Haocheng Zhang, Haocheng Zhang, the HEX-P Collaboration

“…A fraction of the active supermassive black holes at the centers of galaxies in our Universe are capable of launching extreme kiloparsec-long relativistic…”
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ON THE ORIGIN OF THE [gamma]-RAY/OPTICAL LAGS IN LUMINOUS BLAZARS by Janiak, Mateusz, Sikora, Marek, NALEWAJKO, KRZYSZTOF, MODERSKI, RAFAL, Madejski, Greg M

“…Blazars are strongly variable sources that occasionally show spectacular flares visible in various energy bands. These flares are often, but not always,…”
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CONSTRAINING JET PRODUCTION SCENARIOS BY STUDIES OF NARROW-LINE RADIO GALAXIES by Sikora, Marek, Stasinska, Grazyna, KOZIEL-WIERZBOWSKA, DOROTA, Madejski, Greg M, Asari, Natalia V

“…We study a large sample of narrow-line radio galaxies (NLRGs) with extended radio structures. Using 1.4 GHz radio luminosities L sub(1.4), narrow optical…”
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Characteristic X-Ray Variability of TeV Blazars: Probing the Link between the Jet and the Central Engine by Kataoka, Jun, Takahashi, Tadayuki, Wagner, Stefan J, Iyomoto, Naoko, Edwards, Philip G, Hayashida, Kiyoshi, Inoue, Susumu, Madejski, Greg M, Takahara, Fumio, Tanihata, Chiharu, Kawai, Nobuyuki

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Learning about Active Galactic Nucleus Jets from Spectral Properties of Blazars by Sikora, Marek, Madejski, Greg, Moderski, RafaŁ, Poutanen, Juri

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Intrinsic Curvature in the X-Ray Spectra of BL Lacertae Objects by Perlman, Eric S, Madejski, Greg, Georganopoulos, Markos, Andersson, Karl, Daugherty, Timothy, Krolik, Julian H, Rector, Travis, Stocke, John T, Koratkar, Anuradha, Wagner, Stefan, Aller, Margo, Aller, Hugh, Allen, Mark G

“…We report results from XMM-Newton observations of 13 X-ray bright BL Lacertae objects, selected from the Einstein Slew Survey sample (SSS). The survey was…”
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Are Quasar Jets Dominated by Poynting Flux? by Sikora, Marek, Begelman, Mitchell C, Madejski, Greg M, Lasota, Jean-Pierre

“…The formation of relativistic astrophysical jets is presumably mediated by magnetic fields threading accretion disks and central, rapidly rotating objects. As…”
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Evolution of the Synchrotron Spectrum in Markarian 421 during the 1998 Campaign by Tanihata, Chiharu, Kataoka, Jun, Takahashi, Tadayuki, Madejski, Greg M

“…The uninterrupted 7 day ASCA observations of the TeV blazar Mrk 421 in 1998 have clearly revealed that X-ray flares occur repeatedly. In this paper, we present…”
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