Search Publications
Suzaku observation of the Phoenix galaxy
Bianchi, S.; Guainazzi, M.; Comastri, A. +5 more
Context: In recent years, several Seyfert 2 galaxies have been discovered that change state when observed in X-rays a few years apart, switching from Compton-thin to reflection-dominated or viceversa.
Aims: We observed a member of this class of "Changing-look" sources, the Phoenix galaxy, with {Suzaku}, with the aim of better understanding the…
Suzaku-WAM, Konus-Wind, and Swift-BAT Observations of Prompt Emission of the High-Redshift GRB 050904
Yamaoka, Kazutaka; Nakagawa, Yujin E.; Ohno, Masanori +12 more
We present the results of the high-redshift GRB 050904 at z = 6.295 from joint spectral analysis among Swift-BAT, Konus-Wind, and Suzaku-WAM, covering a wide energy range of 15--5000keV. The νFu spectrum peak energy, Epeak, was measured at 314+173-89 keV, corresponding to 2291+1263-634
Magnetosphere response to the 2005 and 2006 extreme solar events as observed by the Cluster and Double Star spacecraft
Cao, Jinbin; Escoubet, Philippe; Rème, Henri +1 more
The four identical Cluster spacecraft, launched in 2000, orbit the Earth in a tetrahedral configuration and on a highly eccentric polar orbit (4-19.6 RE). This allows the crossing of critical layers that develop as a result of the interaction between the solar wind and the Earth’s magnetosphere. Since 2004 the Chinese Double Star TC-1 a…
A New Way to Infer Variations of the Seismic Solar Radius
Hill, F.; González Hernández, I.; Scherrer, P.
We show that the mean phase of waves propagating all the way from the far side of the Sun to the front side, as measured by seismic holography, varies with time. The change is highly anticorrelated with solar cycle activity and is consistent with other recent results on the variation of the seismic radius of the Sun. The phase change that we obser…
Characterization of the emitting and absorbing media around the nucleus of the active galaxy UGC 11763 using XMM-Newton data
Santos-Lleó, M.; Krongold, Y.; Rodríguez-Pascual, P. +3 more
Aims: The detailed analysis of all data taken by the XMM-Newton satellite of UGC 11763 to characterize the different components that are emitting and absorbing radiation in the vicinity of the active nucleus.
Methods: The continuum emission was studied through the EPIC spectra taking profit of the spectral range of these cameras. The high reso…
Chandra Observation of Quiescent Low-Mass X-Ray Binaries in the Globular Cluster NGC 6304
Pavlov, George G.; Guillot, Sebastien; Zavlin, Vyacheslav E. +2 more
This paper presents the analysis of candidate low-mass X-ray binaries in quiescence (qLMXBs) observed during a short Chandra/ACIS observation of the globular cluster (GC) NGC 6304. Two out of the three candidate qLMXBs of this cluster, XMMU 171433-292747 and XMMU 171421-292917, lie within the field of view. This permits comparison with the discove…
Direct measurement of the formation height difference of the 630 nm Fe I solar lines
Faurobert, M.; Uitenbroek, H.; Ricort, G. +4 more
Context: Spectral lines formed over a limited height range in either a stellar or planetary atmosphere provide us with information about the physical conditions within this height range. In this context, an important quantity is the so-called line formation depth. It is usually determined from numerical calculation of the atmospheric opacity in th…
X-ray Emission from the Base of a Current Sheet in the Wake of a Coronal Mass Ejection
Krucker, S.; Lin, R. P.; Saint-Hilaire, P.
Following a coronal mass ejection (CME) which started on 2002 November 26, RHESSI observed for 12 hr an X-ray source above the solar limb, at altitudes between 0.1 and 0.3 RS above the photosphere. The Geostationary Operational Environmental Satellite baseline was remarkably high throughout this event. The X-ray source's temperature pea…
Magnetosheath fluctuations at Venus for two extreme orientations of the interplanetary magnetic field
Zhang, T. L.; Wang, C.; Baumjohann, W. +3 more
Using the magnetosheath crossings of Venus Express on two consecutive days, we investigate magnetic fluctuations in the same locations for two extreme interplanetary magnetic field orientations, i.e., nearly along and nearly perpendicular to the solar wind flow. It is shown that the properties of the fluctuations are drastically different at basic…
Small-scale composition and haze layering in Titan’s polar vortex
Irwin, P. G. J.; Teanby, N. A.; de Kok, R.
Fine scale layering of haze and composition in Titan's stratosphere and mesosphere was investigated using visible/UV images from Cassini's Imaging Science Sub-system (ISS) and IR spectra from Cassini's Composite Infra-Red Spectrometer (CIRS). Both ISS and CIRS independently show fine layered structures in haze and composition, respectively, in the…