Seyferts and Radio Galaxies (2007)
Neil Johnson Andrzej, W. Neil Johnson, Andrzej A. Zdziarski, Greg M. Madejski, William S. Paciesas, Ying-chi Lin
. Observations with Compton Gamma Ray Observatory have provided key insights to the high energy emission mechanisms in Active Galactic Nuclei (AGN) and clearly separate them into a class of Blazars,...
Fl-Ray Spectra, Andrzej A. Zdziarski, David Smith, Greg M. Madejski, W. Neil Johnson
We study X-ray and soft fl-ray spectral properties of nearby Broad-Line Radio Galaxies (BLRGs) using data from Ginga, ASCA, OSSE and EXOSAT. The X-ray spectra are well fitted by an intrinsic...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Probing the disk-jet connection of the radio galaxy 3C 120 observed with Suzaku (2007)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
Probing the Disk-jet Connection of the Radio Galaxy 3C120 Observed with Suzaku (2006)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
Broad line radio galaxies (BLRGs) are a rare type of radio-loud AGN, in which the broad optical permitted emission lines have been detected in addition to the extended jet emission. Here we report on...
Are Quasar Jets Matter or Poynting Flux Dominated? (2005)
Sikora, Marek, Madejski, Greg M., Lasota, Jean-Pierre, Begelman, Mitchell C.
If quasar jets are accelerated by magnetic fields but terminate as matter dominated, where and how does the transition occur between the Poynting-dominated and matter-dominated regimes? To address...
Are quasar jets dominated by Poynting flux? (2005)
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 it is accelerated by magnetic stresses,...
Evolution of the Synchrotron Spectrum in Mrk421 during the 1998 Campaign (2003)
Tanihata, Chiharu, Takahashi, Tadayuki, Kataoka, Jun, Madejski, Greg M.
The uninterrupted 7-day ASCA observations of the TeV blazar Mrk421 in 1998 have clearly revealed that X-ray flares occur repeatedly. In this paper, we present the results of the time-resolved...
Simultaneous Chandra and RXTE observations of the nearby bright Seyfert 2 galaxy NGC4945 (2003)
Done, Chris, Madejski, Greg M., Zycki, Piotr T., Greenhill, Lincoln J.
We analyze recent simultaneous Chandra/RXTE observations of the Seyfert 2 galaxy NGC 4945. The unprecedented spatial resolution of Chandra means we are able to separate the spectra of the nucleus,...
Tanihata, Chiharu, Takahashi, Tadayuki, Kataoka, Jun, Madejski, Greg M.
The recent long look X-ray observations of TeV blazars have revealed many important new features concerning their time variability. In this paper, we suggest a physical interpretation for those...
Tanihata, Chiharu, Urry, C. Megan, Takahashi, Tadayuki, Kataoka, Jun, Wagner, Stefan J., Madejski, Greg M., ...
Three uninterrupted, long (lasting respectively 7, 10, and 10 days) ASCA observations of the well-studied TeV-bright blazars Mrk 421, Mrk 501 and PKS 2155-304 all show continuous strong X-ray...
Kataoka, Jun, Takahashi, Tadayuki, Wagner, Stefan J., Iyomoto, Naoko, Edwards, Philip G., Hayashida, Kiyoshi, ...
We have studied the rapid X-ray variability of three extragalactic TeV gamma-ray sources; Mrk 421, Mrk 501 and PKS 2155-304. Analyzing the X-ray light curves obtained from ASCA and/or RXTE...
Black holes in Active Galactic Nuclei: observations (1999)
This paper summarizes the observations which provide the best evidence for the presence of black holes in active galactic nuclei. This includes: X-ray variability; kinematical studies using optical...
X-ray and soft gamma-ray spectra of Broad-Line Radio Galaxies (1998)
Wozniak, Przemyslaw R., Zdziarski, Andrzej A., Smith, David, Madejski, Greg M., Johnson, W. Neil
We study X-ray and soft gamma-ray spectral properties of BLRGs using data from Ginga, ASCA, OSSE and EXOSAT. The X-ray spectra are well fitted by an intrinsic power-law continuum with an energy index...