Search Publications

Discovery of X-ray emission from the eclipsing brown-dwarf binary 2MASS J05352184-0546085

Schmitt, J. H. M. M.; Czesla, S.; Schneider, P. C.

The eclipsing brown-dwarf binary system 2MASS J05352184-0546085 is a case sui generis. For the first time, it allows a detailed analysis of the individual properties of young brown dwarfs, in particular, masses, and radii, and the temperature ratio of the system components can be determined accurately. The system shows a “temperature reversal" wit…

Recurrent Modulation of Jovian Electron intensities: Ulysses KET measurements

Kunow, H.; Heber, B.; Müller-Mellin, R. +6 more

Corotating Interaction Regions are regions in the heliosphere that are formed at the leading edges of high-speed solar wind streams originating in coronal holes. Their effects on the propagation of energetic particles are known. Here we concentrate on the modulation of Jovian electrons by CIRs observed with the Kiel Electron Telescope. After its l…

Multi-cycle chromospheric activity in II Peg and V711 Tau

Buccino, A. P.; Mauas, P. J. D.

In this work, we studied the Mount Wilson indexes we obtained indirectly from both IUE high and low-resolution spectra of the RS CVn-type systems II Peg (K2IV) and V711 Tau (K1IV+G5V). For both systems, we found a long-term chromospheric activity cycle related to the mean level of activity of the primary star and a shorter cycle associated to the …

Erratum: "Probing Elemental Abundances in SNR 1987A using XMM-Newton" (ApJ, 676, 361 [2008])

Haberl, Frank; Heng, Kevin; Hasinger, Günther +1 more

Dependence of the Characteristics of Solar Wind Discontinuities and Shocks with Heliolatitude and Radial Distance

Dickson Benjamin, A.; Prabhakaran Nayar, S. R.

The distribution of the shocks in the heliosphere and their characteristic variations are investigated using Ulysses observations. The jumps in solar wind velocity, IMF magnitude, and proton density across the shocks and discontinuities are evaluated and used to characterize them. The distribution of these discontinuities with respect to heliolati…

The peculiar horizontal branch morphology of the Galactic globular clusters NGC 6388 and NGC 6441.

Buss, G.

I present multiband optical and UV Hubble Space Telescope photometry of the two Galactic globular clusters NGC 6388 and NGC 6441, in order to investigate the nature of the physical mechanism(s) responsible for the existence of an extended blue tail and of a slope in the horizontal branch. Further evidence that the horizontal branch tilt cannot be …

Plasma Kinetics

Schwartz, Steven J.; Daly, Patrick W.; Lefebvre, Betrand

In Chapter 7 of ISSI SR-001, Schwartz et al. [1998] explain the basic ideas of analysis by means of plasma kinetics: Liouville mapping and finite gyroradius effects. Liouville mapping can be used to relate features of distribution functions such as heating, anisotropies or beams, to the field variations. It is based on the conservation of phase sp…

On analyses of satellite ion scale reconnection data

Mozer, F. S.; Cully, C. M.

Analyses of satellite-measured fields and flows through reconnecting current sheets have assumed that the relative velocity of the satellite and the current sheet is in the direction of the current sheet normal. During analyses, this relative normal velocity has been removed by translation of the satellite data. The assumption that the relative mo…

X-Ray and Optical Followup of Gamma-Ray (up to TeV) Sources

Masetti, N.

The imaging capabilities of the INTEGRAL and HESS observatories allow the study of hard X-ray and TeV sources with unprecedented positional accuracy. Here I review the multiwavelength followup studies which are currently being performed on the unidentified sources detected by these facilities in order to unveil their actual nature.

Active galaxies

Matt, G.

In this paper I will review, in an unavoidably incomplete and biased way, the main results obtained by XMM-Newton on Active Galactic Nuclei. I will then highlight the major issues still open in which XMM-Newton can still give important contributions, expecially if the observing programs will shift in the future towards more long exposures of singl…