Search Publications
Extended hard X-ray emission from Vela X
Renaud, Matthieu; Götz, Diego; Mattana, Fabio +5 more
Vela X powered by the Vela pulsar is the best example of an evolved pulsar wind nebula, allowing to access the particle injection history and the interaction with the supernova ejecta. We present the spectrum of Vela X in the 20-300 keV energy range as measured by IBIS/ISGRI and SPI, the main instruments onboard the INTEGRAL satellite. The apparen…
AKR Sources Positions - Interball 2 vs CLUSTER Observations
Panchenko, M.; Schreiber, R.; Hanasz, J.
Interball-2 (Auroral Probe) Polrad triaxial spectropolarimeter was used to determine positions of AKR source footprints on the auroral oval. Our findings are consistent with AKR beams narrowly confined to a plane tangent to the source magnetic latitude circle and containing the local magnetic field vector, in agreement with Mutel et al. [2008]. Ou…
The flaring blazars of the first 1.5 years of the AGILE mission
Antonelli, L. A.; Costa, E.; Mereghetti, S. +60 more
We report the AGILE γ-ray observations and the results of the multiwavelength campaigns on seven flaring blazars detected by the mission: During two multiwavelength campaigns, we observed γ-ray activity from two Flat Spectrum Radio Quasars of the Virgo region, e.g. 3C 279 and 3C 273 (the latter being the first extragalactic source simultaneously o…
Observations of X-Ray Flares and Associated MHD Oscillations in Star ξ Boo
Srivastava, A. K.; Pandey, J. C.
Using data from observations made with XMM-Newton, we present an X-ray analysis of two flares observed in ξ Boo. The flare loop parameters are derived using various loop models including state-of-the-art hydrodynamic flare model. The loop lengths derived for the flaring loop structure are found to be less than the stellar radius. The exponential d…
Simultaneous Observations of the Chromosphere with TRACE and SUMER
Dammasch, Ingolf E.; Pasachoff, Jay M.; Sterling, Alphonse C. +1 more
Using mainly the 1600 Å continuum channel and also the 1216 Å Lyman-α channel (which includes some UV continuum and C IV emission) aboard the TRACE satellite, we observed the complete lifetime of a transient, bright chromospheric loop. Simultaneous observations with the SUMER instrument aboard the SOHO spacecraft revealed interesting material velo…
Implications of the non-detection of X-ray emission from HD 149427
Luna, G. J. M.; Stute, M.
HD 149427 is a very enigmatic object. It has been classified either as a planetary nebula or as a D'-type symbiotic star. Its distance is also highly uncertain. Furthermore, HD 149427 is a potential jet source. We report the non-detection of X-ray emission from HD 149427 and explore the implications to its nature. We observed the object with XMM-N…
A study of torsional sunspot motion
Pintér, Balázs; Burrows, Keiran; Connor, Erin +1 more
A fundamental understanding of the behaviour of sunspots is a powerful tool by which plasma dynamics and magnetism of the solar interior can also be better understood. Here a straightforward method is presented to investigate the temporal evolution of various sunspot features. Our particular aim is to detect rotations and search for oscillations i…
Orbital and Surface Dynamics for Proximity Operations and Sample Return Strategies at 4015 Wilson-Harrington
Yano, Hajime; Bellerose, Julie
107P/4015 Wilson-Harrington is one of the most intriguing objects, being known for having a cometary history as well as Near Earth Object characteristics, which could answer questions regarding both the origin of life and formation and evolution of small bodies. We first briefly summarize the knowledge state of this small body, leading to its actu…