Search Publications
Cyclotron Resonance Energies at a Low X-Ray Luminosity: A0535+262 Observed with Suzaku
Mukai, K.; Yonetoku, D.; Mihara, T. +28 more
The binary X-ray pulsar A0535+262 was observed with the Suzaku X-ray observatory on 2005 September 14 for a net exposure of 22 ks. The source was in the declining phase of a minor outburst, exhibiting 3-50 keV luminosity of ~3.7×1035 ergs s-1 at an assumed distance of 2 kpc. In spite of the very low source intensity (about 30…
Cosmic-ray diffusion near the Bohm limit in the Cassiopeia A supernova remnant
Stage, M. D.; Allen, G. E.; Houck, J. C. +1 more
The acceleration of cosmic rays in our Galaxy by means of diffusive shock (Fermi) acceleration is believed to occur primarily in supernova remnants (SNRs). Despite considerable theoretical work, the precise details are still unknown, in part because of the difficulty in directly observing nucleons that are accelerated to TeV energies in-and affect…
Suzaku observations of iron lines and reflection in AGN
Kataoka, J.; Fabian, A. C.; Takahashi, T. +8 more
Initial results on the iron K-shell line and reflection component in several AGN observed as part of the Suzaku Guaranteed Time program are reviewed. This paper discusses a small sample of Compton-thin Seyferts observed to date with Suzaku; namely MCG -5-23-16, MCG -6-30-15, NGC 4051, NGC 3516, NGC 2110, 3C 120 and NGC 2992. The broad iron K\alpha…
A short introduction to broad and variable iron lines around black holes
Fabian, A. C.
Accreting black holes often show iron line emission in their X-ray spectra. When this line emission is very broad or variable then it is likely to originate from close to the black hole. The theory and observations of such broad and variable iron lines are briefly reviewed here. In order for a clear broad line to be found, one or more of the follo…
Suzaku Reveals Helium-burning Products in the X-Ray-emitting Planetary Nebula BD +30 3639
Hamaguchi, K.; Matsushita, K.; Hayashida, K. +7 more
BD +30 3639, the brightest planetary nebula at X-ray energies, was observed with Suzaku, an X-ray observatory launched on 2005 July 10. Using the X-ray Imaging Spectrometer, the K lines from C VI, O VII, and O VIII were resolved for the first time, and the C/O, N/O, and Ne/O abundance ratios were determined. The C/O and Ne/O abundance ratios excee…
Suzaku observation of NGC 3516: complex absorption and the broad and narrow Fe K lines
Miniutti, G.; Reeves, J. N.; Yaqoob, T. +9 more
We present preliminary results from a 150 ks Suzaku observation of the Seyfert 1 galaxy NGC 3516. Suzaku's wide bandpass has enabled us to deconvolve the broadband emitting and absorbing components in this object, breaking model degeneracies inherent in previous, smaller-bandpass spectra. The primary power-law continuum is absorbed by an ionized a…
Analysis of the Suzaku/XRS background
Ishisaki, Y.; Mitsuda, K.; Boyce, K. R. +14 more
Background counts on the XRS calorimeter spectrometer of the Suzaku Observatory (formerly Astro-E2) have several sources, including primary cosmic rays and secondary particles interacting with the pixels and with the silicon structure of the array. Using ground data, we identified the types of correlations between events on different pixels, and b…
Neon dewar for the X-ray spectrometer onboard Suzaku
Mitsuda, K.; Kelley, R. L.; Fujimoto, R. +6 more
The X-ray spectrometer (XRS) onboard Suzaku is the first X-ray microcalorimeter array in orbit. The sensor array is operated at 60 mK, which is attained by an adiabatic demagnetization refrigerator and superfluid liquid helium. The neon dewar is a vacuum-insulated container for the XRS. The requirements for the XRS dewar are to maintain the detect…
The Astro-E2/XRS-2 helium insert system
Mitsuda, K.; Fujimoto, R.; McCammon, D. +5 more
The X-ray Spectrometer (XRS-2) instrument on the Japanese Space Agency (JAXA) Astro-E2 spacecraft will measure faint X-ray emissions in the energy range of 0.2-10 keV. A square array of 32 X-ray microcalorimeters used will be able to distinguish individual photons to better than 10 eV at 6 keV, with a quantum efficiency near 100%. The detectors ar…
The broad iron line physics: summary and outlook
Tanaka, Y.
A brief overview of the ESAC/XMM-Newton Science Operations Centre Workshop on ``Variable and Broad Iron Lines around Black Holes" is presented. Following the relativistic disk-line theory of accreting black holes, ASCA discovered such broad iron lines from several AGN. XMM-Newton and Chandra confirmed the ASCA results, but also found more complexi…