Search Publications
M31N 2008-05d: a M 31 disk nova with a dipping supersoft X-ray light curve
Della Valle, M.; Stiele, H.; Pietsch, W. +4 more
Context. Classical novae (CNe) represent a major class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Significantly different SSS properties of CNe in the M 31 bulge and disk were indicated by recent X-ray population studies, which however considered only a small number of disk novae.
Aims: We initiat…
Suzaku observations of charge exchange emission from solar system objects
Futaana, Y.; Mitsuda, K.; Porter, F. S. +9 more
Recent results of charge exchange emission from solar system objects observed with the Japanese Suzaku satellite are reviewed. Suzaku is of great importance to investigate diffuse X-ray emission like the charge exchange from planetary exospheres and comets. The Suzaku studies of Earth's exosphere, Martian exosphere, Jupiter's aurorae, and comets a…
The X-Ray Transient 2XMMi J003833.3+402133: A Candidate Magnetar at High Galactic Latitude
Callingham, J. R.; Farrell, S. A.; Gaensler, B. M. +2 more
We present detailed analysis of the transient X-ray source 2XMMi J003833.3+402133 detected by XMM-Newton in 2008 January during a survey of M31. The X-ray spectrum is well fitted by either a steep power law plus a blackbody model or a double blackbody model. Prior observations with XMM-Newton, Chandra, Swift, and ROSAT spanning 1991-2007, as well …
Model of the magnetic field in the inner heliosphere with regard to radial field strength leveling in the solar corona
Veselovsky, I. S.; Lukashenko, A. T.
On the basis of experimental results from the Ulysses spacecraft, a model is proposed for calculating the magnetic field in the corona and the heliosphere in the potential approximation, which is a modification of the potential-field source-surface model. In addition to the photospheric surface and the source surface, a new demarcated spherical su…
Drift modes of a quasi-two-dimensional current sheet
Popov, V. Yu.; Zelenyi, L. M.; Artemyev, A. V. +1 more
Stability of a plasma configuration consisting of a thin one-dimensional current sheet embedded into a two-dimensional background current sheet is studied. Drift modes developing in plasma as unstable waves along the current direction are considered. Dispersion relations for kink and sausage perturbation modes are obtained depending on the ratio o…
a Multi-Wavelength View of Galaxy Evolution with Akari
White, G. J.; Serjeant, S.; Smith, M. W. L. +2 more
AKARI's all-sky survey resolves the far-infrared emission in many thousands of nearby galaxies, providing essential local benchmarks against which the evolution of high-redshift populations can be measured. This review presents some recent results in the resolved galaxy populations, covering some well-known nearby targets, as well as samples from …
Numerical Simulation of a Solar Active Region. I: Bastille Day Flare
Charbonneau, Paul; Vincent, Alain; Dubé, Caroline
We present three-dimensional unsteady modeling and numerical simulations of a coronal active region, carried out within the compressible single-fluid MHD approximation. We focus on AR 9077 on 14 July 2000, and the triggering of the X5.7 GOES X-ray class "Bastille Day" flare. We simulate only the lower corona, although we include a virtual photosph…
Unusually short period in electrons at Saturn
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +1 more
When subject to Lomb periodogram analyses, fluxes of energetic electrons (27-496 keV) observed during the first 245 days of 2012 exhibit both mono and dual periods depending on energy. For E < 100 keV electrons, dual periods at 9.95 hours and 10.64 hours are evident, with the strongest signal at the shortest period. For higher energy electrons,…
Seyfert's Sextet: where is the gas?
Wolter, A.; Tamburri, S.; Trinchieri, G. +3 more
Aims: Seyfert's Sextet (a.k.a HCG 79) is one of the most compact and isolated galaxy groups in the local Universe. It shows a prominent diffuse light component that accounts for ~50% of the total observed light. This likely indicates that the group is in an advanced evolutionary phase, which would predict a significant hot gaseous component. …
Ionogram inversion for MARSIS topside sounding
Wan, Weixing; Han, Xiuhong
In the present paper, we propose a method of ionogram inversion to retrieve the electron density profile, Ne(h), of the Martian ionosphere from the topside ionogram, which is measured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on board the Mars Express spacecraft. The new inversion technique is…