Suzaku Wide Band Analysis of the X-ray Variability of TeV Blazar Mrk 421 in 2006 (2009)
Ushio, Masayoshi, Tanaka, Takaaki, Madejski, Grzegorz, Takahashi, Tadayuki, Hayashida, Masaaki, Kataoka, Jun, ...
We present the results of X-ray observations of the well-studied TeV blazar Mrk 421 with the Suzaku satellite in 2006 April 28. During the observation, Mrk 421 was undergoing a large flare and the...
Prevalence of High X-ray Obscuring Columns among AGN that Host H$_2$O Masers (2008)
Greenhill, Lincoln J., Tilak, Avanti, Madejski, Grzegorz
Of 104 AGN known to exhibit H$_2$O maser emission, X-ray data that enable estimation of column densities, or lower limits, are available for 42. Contributing to this, we report analysis of new and...
A Deep 0.3-10 keV Spectrum of the H$_{2}$O Maser Galaxy IC 2560 (2008)
Tilak, Avanti, Greenhill, Lincoln, Done, Chris, Madejski, Grzegorz
We present a new XMM-Newton spectrum of the Seyfert 2 nucleus of IC 2560, which hosts H$_{2}$O maser emission from an inclined Keplerian accretion disk. The X-ray spectrum shows soft excess due to...
PoGOLite - A High Sensitivity Balloon-Borne Soft Gamma-ray Polarimeter (2007)
Kamae, Tuneyoshi, Andersson, Viktor, Arimoto, Makoto, Axelsson, Magnus, Bettolo, Cecilia Marini, Björnsson, Claes-Ingvar, ...
We describe a new balloon-borne instrument (PoGOLite) capable of detecting 10% polarisation from 200mCrab point-like sources between 25 and 80keV in one 6 hour flight. Polarisation measurements in...
Suzaku wide-band X-ray Spectroscopy of the Seyfert 2 AGN in NGC 4945 (2007)
Itoh, Takeshi, Done, Chris, Makishima, Kazuo, Madejski, Grzegorz, Awaki, Hisamitsu, Isobe, Naoki, ...
Suzaku observed a nearby Seyfert 2 galaxy NGC4945, which hosts one of the brightest active galactic nuclei above 20 keV. Combining data from the X-ray CCD camera (XIS) and the Hard X-ray Detector...
INTEGRAL and RXTE observations of Centaurus A (2006)
Rothschild, Richard E., Wilms, Jörn, Tomsick, John, Staubert, Rüdiger, Benlloch, Sara, Collmar, Werner, ...
INTEGRAL and RXTE Observations of Centaurus A (2005)
Rothschild, Richard E., Wilms, Joern, Tomsick, John, Staubert, Ruediger, Benlloch, Sara, Collmar, Werner, ...
INTEGRAL and RXTE performed three simultaneous observations of the nearby radio galaxy Cen A in 2003 March, 2004 January, and 2004 February with the goals of investigating the geometry and emission...
Gamma-ray Polarimetry with Compton Telescope (2004)
Tajima, Hiroyasu, Madejski, Grzegorz, Mitani, Takefumi, Tanaka, Takaaki, Nakamura, Hidehito, Nakazawa, Kazuhiro, ...
Compton telescope is a promising technology to achieve very high sensitivity in the soft gamma-ray band (0.1-10 MeV) by utilizing Compton kinematics. Compton kinematics also enables polarization...
BL Lac X-ray Spectra: simpler than we thought (2004)
Perlman, Eric S., Daugherty, Timothy, Koratkar, Anuradha, Madejski, Grzegorz, Andersson, Karl, Krolik, Julian H., ...
We report results from {\it XMM-Newton} observations of thirteen X-ray bright BL Lacertae objects, selected from the {\it Einstein} Slew Survey sample. The spectra are generally well fit by power-law...