Search Publications
Understanding magnetotail current sheet meso-scale structures using MHD simulations
El-Alaoui, Mostafa; Ashour-Abdalla, Maha; Richard, Robert L. +1 more
Recent Cluster observations have strongly supported the existence of meso-scale structure in the magnetotail current sheet. In our study, a magnetohydrodynamic simulation event study exhibited current sheet behavior comparable to that seen in the Cluster observations. Geotail and DoubleStar observations also show that the simulation is providing a…
Black hole at the center of the globular cluster M15: Estimation of the mass and specific angular momentum
Kiselev, A. A.; Shakht, N. A.; Gnedin, Yu. N. +3 more
Using the technique of determining the sum of the masses of double stars, we have estimated the mass of the central object in the globular cluster M15. The radial velocities of stars at distances up to 1″ from the cluster center have been used. The parameters of circular orbits and the space velocities of 11 selected field stars relative to the cl…
Local field-aligned currents in the magnetotail and ionosphere as observed by a Cluster, Double Star, and MIRACLE conjunction
RèMe, H.; Fazakerley, A. N.; Klecker, B. +12 more
During a fortuitous conjunction event observed by Cluster, Double Star TC1, and Magnetometers-Ionospheric Radars-All-Sky Cameras Large Experiment (MIRACLE) magnetometer stations at almost the same local time, crossings of the plasma sheet boundary layer (PSBL) are observed with a 45-50 s delay between the two spacecraft located approximately 6 R
The stellar populations of M33's outer regions - IV. Inflow history and chemical evolution
Sarajedini, A.; Barker, Michael K.
We have modelled the observed colour-magnitude diagram (CMD) at one location in M33's outskirts under the framework of a simple chemical evolution scenario which adopts instantaneous and delayed recycling for the nucleosynthetic products of Type II and Ia supernovae. In this scenario, interstellar gas forms stars at a rate modulated by the Kennicu…
Cluster geometry and inclinations from deprojection uncertainties. Cluster geometry and inclination
Chakrabarty, D.; Russell, H.; de Filippis, E.
Context: The determination of cluster masses is a complex problem that would be aided by information about the cluster shape and orientation (with respect to the line-of-sight).
Aims: It is in this context, that we have developed a scheme for identifying the intrinsic morphology and inclination of a cluster, by looking for the signature of the…
Short-Lived Absorptive Type III-like Microwave Bursts as a Signature of Fragmented Electron Injections
Chen, Bin; Yan, Yihua
In this paper, we devote ourselves to interpreting the short-lived absorptive type III-like microwave bursts in the 2006 December 13 flare event observed with high temporal and spectral resolutions (8 ms and 10 MHz) by the Chinese Solar Broadband Radio Spectrometer (SBRS/Huairou) at 2.6-3.8 GHz. In the decimeter-centimeter wavelength range, we fir…
Synthetic photometry of speckle interferometric binaries
Al-Wardat, M. A.
The synthetic magnitudes and color indices of 46 speckle interferometric stars have been computed depending on their observational spectral energy distributions. The Strömgren vby and Tycho BV passbands have been used to calculate magnitudes of the systems. These data when combined with the magnitude differences of the sub-components from speckle …
Influence of the tilt angle on the bow shock shape and location
Merka, J.; Šafránková, J.; Jelínek, K. +1 more
The bow shock is created in front of an obstacle immersed into a supersonic flow and its location depends on the size and shape of the obstacle. It was found that the obstacle (magnetopause) is scaled with the solar wind dynamic pressure and changes its dimensions and shape with the dipole tilt angle and interplanetary magnetic field orientation. …
Discovery of thermal X-ray emission in the supernova remnant G337.8-0.1 (Kes 41)
Combi, J. A.; Martí, J.; Albacete-Colombo, J. F.
Aims: We report here on the first detection at X-ray wavelengths of the Supernova Remnant (SNR) G337.8-0.1, carried out with the XMM-Newton Observatory.
Methods: Using the X-ray observations, we studied the X-ray morphology of the remnant at different energy ranges, analysed the spectral properties and investigated a possible variable behavior…
Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarf
Mukai, K.; Nakamura, R.; Enoto, T. +7 more
Although rotating neutron stars (NSs) have been regarded as being textbook examples of astrophysical particle acceleration sites for decades, details of the acceleration mechanism remain a mystery; for example, we cannot yet observationally distinguish “polar cap” models from “outer gap” models. To solve the model degeneracy, it is useful to study…