Search Publications
Suzaku X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301
Kaastra, J. S.; van Weeren, R. J.; Brüggen, M. +7 more
Context. We present the results from Suzaku observations of the merging cluster of galaxies
Aims: To study the physics of gas heating and particle acceleration in cluster mergers, we investigated the X-ray emission from
A possible cyclotron resonance scattering feature near 0.7 keV in X1822-371
Sanna, A.; Robba, N. R.; Ferrigno, C. +9 more
Context. The source X1822-371 is a low-mass X-ray binary system (LMXB) viewed at a high inclination angle. It hosts a neutron star with a spin period of ~0.59 s, and recently, the spin period derivative was estimated to be (-2.43 ± 0.05) × 10-12 s/s.
Aims: Our aim is to address the origin of the large residuals below 0.8 keV previo…
Redshifted Fe Kα line from the unusual γ-ray source PMN J1603-4904
Stawarz, Ł.; Dauser, T.; Wilms, J. +13 more
Context. Multiwavelength observations have revealed the highly unusual properties of the γ-ray source PMN J1603-4904, which are difficult to reconcile with any other well-established γ-ray source class. The object is either a very atypical blazar or a compact jet source seen at a larger angle to the line of sight.
Aims: To determine the physi…
A variable-density absorption event in NGC 3227 mapped with Suzaku and Swift
Guainazzi, M.; Elvis, M.; Miniutti, G. +15 more
Context. The morphology of the circumnuclear gas accreting onto supermassive black holes in Seyfert galaxies remains a topic of much debate. As the innermost regions of active galactic nuclei (AGN) are spatially unresolved, X-ray spectroscopy, and in particular line-of-sight absorption variability, is a key diagnostic to map out the distribution o…
An X-ray variable absorber within the broad line region in Fairall 51
Guainazzi, M.; Piconcelli, E.; Wilms, J. +3 more
Context. Fairall 51 is a polar-scattered Seyfert 1 galaxy, a type of active galaxy believed to represent a bridge between unobscured type-1 and obscured type-2 objects. Fairall 51 has shown complex and variable X-ray absorption, but little is known about its origin.
Aims: In our research, we observed Fairall 51 with the X-ray satellite Suzaku…
Revealing a hard X-ray spectral component that reverberates within one light hour of the central supermassive black hole in Ark 564
Turner, T. J.; Kraemer, S. B.; Reeves, J. N. +4 more
Context. Arakelian 564 (Ark 564, z = 0.0247) is an X-ray-bright narrow-line Seyfert 1 galaxy. By using advanced X-ray timing techniques, an excess of "delayed" emission in the hard X-ray band (4-7.5 keV) following about 1000 s after "flaring" light in the soft X-ray band (0.4 - 1 keV) was recently detected.
Aims: We report on the X-ray spectr…