Search Publications
Relativistic Lines and Reflection from the Inner Accretion Disks Around Neutron Stars
Miller, Jon M.; Cackett, Edward M.; Wijnands, Rudy +6 more
A number of neutron star low-mass X-ray binaries (LMXBs) have recently been discovered to show broad, asymmetric Fe K emission lines in their X-ray spectra. These lines are generally thought to be the most prominent part of a reflection spectrum, originating in the inner part of the accretion disk where strong relativistic effects can broaden emis…
Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A
Ozaki, M.; Caraveo, P. A.; Frailis, M. +195 more
We present γ-ray observations with the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope of the nearby radio galaxy Centaurus A (Cen A). The previous EGRET detection is confirmed, and the localization is improved using data from the first 10 months of Fermi science operation. In previous work, we presented the detection of th…
Discovery of Ultra-fast Outflows in a Sample of Broad-line Radio Galaxies Observed with Suzaku
Cappi, M.; Ballo, L.; Tombesi, F. +5 more
We present the results of a uniform and systematic search for blueshifted Fe K absorption lines in the X-ray spectra of five bright broad-line radio galaxies observed with Suzaku. We detect, for the first time in radio-loud active galactic nuclei (AGNs) at X-rays, several absorption lines at energies greater than 7 keV in three out of five sources…
Efficient Cosmic Ray Acceleration, Hydrodynamics, and Self-Consistent Thermal X-Ray Emission Applied to Supernova Remnant RX J1713.7-3946
Raymond, John; Slane, Patrick; Ellison, Donald C. +1 more
We model the broadband emission from supernova remnant (SNR) RX J1713.7-3946 including, for the first time, a consistent calculation of thermal X-ray emission together with non-thermal emission in a nonlinear diffusive shock acceleration model. Our model tracks the evolution of the SNR including the plasma ionization state between the forward shoc…
``Comets'' orbiting a black hole
Maiolino, R.; Elvis, M.; Fabbiano, G. +6 more
We use a long (300 ks), continuous Suzaku X-ray observation of the active nucleus in NGC 1365 to investigate the structure of the circumnuclear broad line region (BLR) clouds through their occultation of the X-ray source. The variations of the absorbing column density and of the covering factor indicate that the clouds surrounding the black hole a…
Suzaku Observation of A1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-scale Structure
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Ohashi, Takaya +7 more
We present results of new, deep Suzaku X-ray observations (160 ks) of the intracluster medium (ICM) in A1689 out to its virial radius, combined with complementary data sets of the projected galaxy distribution obtained from the SDSS catalog and the projected mass distribution from our recent comprehensive weak and strong lensing analysis of Subaru…
X-Ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
Hoshino, Akio; Sato, Kosuke; Fukazawa, Yasushi +14 more
We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A 1413 with Suzaku, whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions. We excised 15 point sources superimposed on the image above a flux of 1 × 10-14erg cm-2s-1
Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission
Katsuda, Satoru; Kunieda, Hideyo; Makishima, Kazuo +10 more
We show that the expansion of ejecta in Tycho's supernova remnant (SNR) is consistent with a spherically symmetric shell, based on Suzaku measurements of the Doppler broadened X-ray emission lines. All of the strong Kα line emissions show broader widths at the center than at the rim, while the centroid energies are constant across the remnant (exc…
3D models of radiatively driven colliding winds in massive O + O star binaries - III. Thermal X-ray emission
Pittard, J. M.; Parkin, E. R.
The X-ray emission from the wind-wind collision in short-period massive O + O star binaries is investigated. The emission is calculated from 3D hydrodynamical models which incorporate gravity, the driving of the winds, orbital motion of the stars and radiative cooling of the shocked plasma. Changes in the amount of stellar occultation and circumst…
White dwarf masses in intermediate polars observed with the Suzaku satellite
Yamada, S.; Makishima, K.; Ebisawa, K. +5 more
Context. White dwarfs (WDs) in cataclysmic variables (CVs) are important experimental laboratories where the electron degeneracy is taking place on a macroscopic scale. Magnetic CVs increase in number especially in the hard X-ray band (≳ 10 keV) thanks to sensitive hard X-ray missions.
Aims: From X-ray spectroscopy, we estimate the masses of …