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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…
First results of the XI Groups Project: studying an unbiased sample of galaxy groups
Raychaudhury, Somak; Mulchaey, John S.; Ponman, Trevor J. +2 more
X-ray observations of hot, intergalactic gas in galaxy groups provide a useful means of characterizing the global properties of groups. However, X-ray studies of large group samples have typically involved very shallow X-ray exposures or have been based on rather heterogeneous samples. Here we present the first results of the XI (XMM/IMACS) Groups…
On the Feedback from Super Stellar Clusters. I. The Structure of Giant H II Regions and H II Galaxies
Tenorio-Tagle, Guillermo; Muñoz-Tuñón, Casiana; Pérez, Enrique +2 more
We review the structural properties of giant extragalactic H II regions and H II galaxies based on two-dimensional hydrodynamic calculations and propose an evolutionary sequence that accounts for their observed detailed structure. The model assumes a massive and young stellar cluster surrounded by a large collection of clouds. These are thus expos…
XMM-Newton observations of a sample of γ-ray loud active galactic nuclei
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +7 more
Aims.To understand the nature of γ-ray loud active galactic nuclei (AGN) and the mechanisms for the generation of high-energy γ-rays.
Methods: .We performed a homogeneous and systematic analysis of simultaneous X-ray and optical/UV properties of a group of 15 γ-ray loud AGN, using observations performed with XMM-Newton. The sample is composed …
Relationships Among Magnetic Clouds, CMES, and Geomagnetic Storms
Gopalswamy, N.; Lepping, R. P.; Wu, C. C.
During solar cycle 23, 82 interplanetary magnetic clouds (MCs) were identified by the Magnetic Field Investigation (MFI) team using Wind (1995 - 2003) solar wind plasma and magnetic field data from solar minimum through the maximum of cycle 23. The average occurrence rate is 9.5 MCs per year for the overall period. It is found that some of the ano…
The role of the wind-transported dust in slope streaks activity: Evidence from the HRSC data
Mangold, N.; Forget, F.; Neukum, G. +7 more
Slope streaks are gravity-driven albedo features observed on martian slopes since the Viking missions. The debated mechanism of formation could involve alternatively dry granular flow or wet mass wasting. A systematic mapping of slope streaks from the High Resolution Stereo Camera is presented in this paper. Two regions known for their slope strea…
Statistical Analysis of Reconnection Inflows in Solar Flares Observed with SOHO EIT
Shibata, Kazunari; Narukage, Noriyuki
We report observations of reconnection inflows in extreme ultraviolet (EUV) Fe XII λ195 images with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO). Yokoyama and colleagues reported the first example observed on 1999 March 18. We survey the EIT data from 1996 to 2000 and find six new inflow ev…
Wake formation behind positively charged spacecraft in flowing tenuous plasmas
Eriksson, A. I.; Engwall, E.; Forest, J.
Spacecraft in tenuous plasmas become positively charged because of photoelectron emission. If the plasma is supersonically drifting with respect to the spacecraft, a wake forms behind it. When the kinetic energy of the positive ions in the plasma is not sufficient to overcome the electrostatic barrier of the spacecraft potential, they scatter on t…
Saturn lightning recorded by Cassini/RPWS in 2004
Gurnett, D. A.; Kurth, W. S.; Rucker, H. O. +8 more
During 2004 the Cassini/RPWS (Radio and Plasma Wave Science) instrument recorded about 5400 SEDs (Saturn Electrostatic Discharges), which were organized in 4 storm systems and 95 episodes. A computer algorithm with different intensity thresholds was applied to extract the SEDs from the RPWS data, and a statistical analysis on the main characterist…