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The ultraluminous X-ray sources in the high-velocity system of NGC1275
Fabian, A. C.; Sanders, J. S.; González-Martín, O.
We report the results of a study of X-ray point sources coincident with the high-velocity system (HVS) projected in front of NGC1275. A very deep X-ray image of the core of the Perseus cluster, made with the Chandra X-ray Observatory, has been used. We find a population of ultraluminous X-ray sources [ULXs seven sources with LX(0.5 - 7.…
The changing topology of the duskside magnetopause boundary layer in relation to IMF orientation
Farrugia, C. J.; Wild, J. A.; Kistler, L. M. +9 more
On 7 December 2000, Cluster made an extended outbound radial traversal of the duskside magnetopause boundary layer. The long duration of the crossing, during which Cluster spent several hours within 2RE of the nominal magnetopause, allows us to deconvolve the structure of this boundary layer in its dependence on interplanetary parameter…
Solar VUV measurements obtained by SOHO instruments and their radiometric calibration
Wilhelm, Klaus
The Solar and Heliospheric Observatory (SOHO) of ESA and NASA is equipped with a suite of instruments capable of observing the Sun from the core to the outer corona. Several of these instruments detect radiation in the vacuum-ultraviolet (VUV) wavelength range (shortwards of 200 nm), where precise and accurate radiometric measurements are of extre…
Dynamics and characteristics of electric-field structures in the auroral return current region observed by Cluster
André, M.; Buchert, S.; Kistler, L. M. +5 more
The temporal evolution and other characteristics of intense quasi-static electric fields in the return current region are discussed using Cluster observations. A narrow-scale, divergent electric field, the high-altitude signature of a positive U-shaped potential structure, was observed at the poleward edge of the central plasma sheet, close to mag…
Arp 116: interacting system or chance alignment?
de Grijs, R.; Robertson, A. R. I.
Using high spatial resolution Hubble Space Telescope/Advanced Camera for Surveys archival imaging observations of
HST WFPC2 Observations of the Peculiar Main Sequence of the Double Star Cluster NGC 2011 in the Large Magellanic Cloud
Gouliermis, D. A.; Dapergolas, A.; Kontizas, M. +2 more
We report the serendipitous discovery of a peculiar main sequence in archived Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) observations of the young star cluster NGC 2011 in the Large Magellanic Cloud. The bright part of this main sequence exhibits a prominent double, forklike feature, as if it consists of twin main sequences, one …
Multi-wavelength study of a high velocity event near a sunspot
Doyle, J. G.; Banerjee, D.; O'Shea, E. +1 more
Context: .Jets with velocities higher than 200 km s-1 are often observed in the X-ray spectral range in the solar atmosphere, however, very few such objects are observed in the EUV range.
Aims: .We report on an eruptive event observed in the south-west side of a sunspot, within active region, AR0554, in a range of spectral lines for…
Digging deep for ice in Isidis Planitia—New constraints on subsurface volatile concentrations from thermal modeling
Helbert, J.; Benkhoff, J.
The Isidis Planitia region on Mars usually is regarded as a comparably attractive site for landing missions based on engineering constraints such as elevation and smooth regional topography. The Mars Express landed element Beagle 2 was deployed to this area, and the southern margin of the basin was selected as one of the backup landing sites for t…
On VI Asymmetry and an Accelerated Outflow in an Obscured Seyfert: FUSE and HST STIS Spectroscopy of Mrk 533
Hutchings, John; Whittle, Mark; Wills, Beverley J. +2 more
We present far-ultraviolet spectra of the Seyfert 2 galaxy Mrk 533 obtained with FUSE. These spectra show narrow asymmetrical O VI λλ1032,1038 emission lines with stronger wings shortward of the peak wavelength, but the degree of asymmetry of these wings in velocity is much lower than that of the wings of the lines of lower ionization. In the comb…
Measuring and understanding space turbulence
Belmont, Gérard; Rezeau, Laurence; Sahraoui, Fouad
For many physical issues including reconnection, the role of waves and turbulence is likely to be predominant in space physics. This role can be viewed as a natural consequence of the general properties of turbulence, but these properties, although widely recognized in hydrodynamics, are much less familiar in plasmas. The connections between the d…