Search Publications
New X-ray observations of IQ Aurigae and α2 Canum Venaticorum. Probing the magnetically channeled wind shock model in A0p stars
Schmitt, J. H. M. M.; Robrade, J.
Aims: We re-examine the scenario of X-ray emission from magnetically confined/channeled wind shocks (MCWS) for Ap/Bp stars, a model originally developed to explain the ROSAT detection of the A0p star IQ Aur.
Methods: We present new X-ray observations of the A0p stars α2 CVn (Chandra) and IQ Aur (XMM-Newton) and discuss our fin…
The large-scale diffuse radio emission in A781
Bonafede, A.; Govoni, F.; Giovannini, G. +2 more
Context. A781 belongs to a complex system characterized by extended X-ray emissions that may form part of line of clusters of galaxies along a filament.
Aims: The aim of this work is to investigate the possible presence of extended, diffuse synchrotron radio emission connected to the intra-cluster medium of A781.
Methods: We studied the …
The massive star clusters in the dwarf merger ESO 185-IG13: is the red excess ubiquitous in starbursts?
Östlin, G.; Hayes, M.; Adamo, A. +1 more
We have investigated the starburst properties of the luminous blue compact galaxy ESO 185-IG13. The galaxy has been imaged with the high-resolution cameras onboard the Hubble Space Telescope. From the ultraviolet (UV) to the infrared (IR), the data reveal a system shaped by hundreds of young star clusters, and fine structures, like a tidal stream …
Saturn's equatorial oscillation: Evidence of descending thermal structure from Cassini radio occultations
French, R. G.; Flasar, F. M.; Rappaport, N. J. +7 more
A series of near-equatorial radio occultations of Cassini by Saturn occurred in 2005 and again in 2009-2010. Comparison of the temperature-pressure profiles obtained from the two sets of occultations shows evidence of a descending pattern in the stratosphere that is similar to those associated with equatorial oscillations in Earth's middle atmosph…
Nonlinear Force-Free and Potential-Field Models of Active-Region and Global Coronal Fields during the Whole Heliosphere Interval
Canou, A.; Amari, T.; Petrie, G. J. D.
Between 24 March 2008 and 2 April 2008, the three active regions (ARs) NOAA 10987, 10988 and 10989 were observed daily by the Synoptic Optical Long-term Investigations of the Sun (SOLIS) Vector Spectro-Magnetograph (VSM) while they traversed the solar disk. We use these measurements and the nonlinear force-free magnetic field code XTRAPOL to recon…
Investigation of mass flows in the transition region and corona in a three-dimensional numerical model approach
Peter, H.; Zacharias, P.; Bingert, S.
Context. The origin of solar transition region redshifts is not completely understood. Current research is addressing this issue by investigating three-dimensional magneto-hydrodynamic models that extend from the photosphere to the corona.
Aims: By studying the average properties of emission line profiles synthesized from the simulation runs …
The 2006 Outburst of the Magnetar CXOU J164710.2 - 455216
Kaspi, Victoria M.; Woods, Peter M.; Gavriil, Fotis P. +1 more
We report on data obtained with the Chandra, XMM-Newton, Suzaku, and Swift X-ray observatories, following the 2006 outburst of the Anomalous X-ray Pulsar CXOU J164710.2-455216. Using a more complete and higher signal-to-noise data set, we find no evidence for the very large glitch and rapid exponential decay as was reported previously for this sou…
Hierarchical approach to forecasting recurrent solar wind streams
Berghmans, D.; Seaton, D. B.; Veselovsky, I. S. +1 more
The hierarchical approach to predicting quasi-stationary, high-speed solar wind (SW) streams is described. This approach integrates various types of data into a single forecasting system by means of an ensemble of experts. The input data included the daily values of the coronal hole areas, which were calculated from the ultraviolet images of the S…
The energetics of giant radio galaxy lobes from inverse Compton scattering observations
Colafrancesco, S.; Marchegiani, P.
Context. Giant radio galaxy (GRG) lobes are excellent laboratories for studying the evolution of the particle and magnetic field energetics and the past activity of radiogalaxy jets, as indicated by recent results of X-ray observations with Suzaku. However, these results are based on assumptions of the shape and extension of the GRG lobe electron …
Mid-infrared interferometry of the massive young stellar object NGC 2264 IRS 1
Grellmann, R.; Weigelt, G.; Preibisch, T. +3 more
Context. The optically invisible infrared-source NGC 2264 IRS 1 lying north of the Cone Nebula is thought to be a massive young stellar object (~10 M⊙). Although strong infrared excess clearly shows that the central object is surrounded by large amounts of circumstellar material, no information about the spatial distribution of this cir…