Search Publications
Saturn chorus intensity variations
Schippers, P.; Gurnett, D. A.; Hospodarsky, G. B. +4 more
mode chorus plasma wave emissions have been observed at Saturn near the magnetic equator and the source region. During crossings of the magnetic equator along nearly constant L shells, the Cassini Radio and Plasma Wave Science Investigation often observes a local decrease in whistler mode intensity and bandwidth closest to the magnetic equator, wh…
The fundamental parameters of the roAp star 10 Aquilae
Chesneau, O.; Goldfinger, P. J.; Sturmann, J. +12 more
Context. Owing to the strong magnetic field and related abnormal surface layers existing in rapidly oscillating Ap (roAp) stars, systematic errors are likely to be present when determining their effective temperatures, which potentially compromises asteroseismic studies of this class of pulsators.
Aims: Using the unique angular resolution pro…
Acceleration of solar wind ions to 1 MeV by electromagnetic structures upstream of the Earth's bow shock
Yamauchi, M.; Stasiewicz, K.; Markidis, S. +2 more
We present measurements from the ESA/NASA Cluster mission that show in situ acceleration of ions to energies of 1 MeV outside the bow shock. The observed heating can be associated with the presence of electromagnetic structures with strong spatial gradients of the electric field that lead to ion gyro-phase breaking and to the onset of chaos in ion…
What Have We Learned from Helioseismology, What Have We Really Learned, and What Do We Aspire to Learn?
Gough, Douglas
Helioseismology has been widely acclaimed as having been a great success: it appears to have answered nearly all the questions that we originally asked, some with unexpectedly high precision. We have learned how the sound speed and matter density vary throughout almost all of the solar interior - something which not so very long ago was generally …
Modeling the seasonal variability of the plasma environment in Saturn's magnetosphere between main rings and Mimas
Johnson, R. E.; Elrod, M. K.; Tseng, W. -L.
The detection of O2+ and O+ ions over Saturn's main rings by the Cassini INMS and CAPS instruments at Saturn orbit insertion (SOI) in 2004 confirmed the existence of the ring atmosphere and ionosphere. The source mechanism was suggested to be primarily photolytic decomposition of water ice producing neutral O2…
Probing Dynamics of Electron Acceleration with Radio and X-Ray Spectroscopy, Imaging, and Timing in the 2002 April 11 Solar Flare
Kontar, Eduard P.; Fleishman, Gregory D.; Nita, Gelu M. +1 more
Based on detailed analysis of radio and X-ray observations of a flare on 2002 April 11 augmented by realistic three-dimensional modeling, we have identified a radio emission component produced directly at the flare acceleration region. This acceleration region radio component has distinctly different (1) spectrum, (2) light curves, (3) spatial loc…
Observations of the High-mass X-Ray Binary A 0535+26 in Quiescence
Fürst, Felix; Pottschmidt, Katja; Wilms, Jörn +7 more
We have analyzed three observations of the high-mass X-ray binary A 0535+26 performed by the Rossi X-Ray Timing Explorer (RXTE) three, five, and six months after the last outburst in 2011 February. We detect pulsations only in the second observation. The 3-20 keV spectra can be fit equally well with either an absorbed power law or absorbed thermal…
XMM-Newton observations of the Galactic Centre Region - II. The soft-thermal emission
Warwick, R. S.; Heard, V.
We have extended our earlier study of the X-ray emission emanating from the central 100 pc × 100 pc region of our Galaxy to an investigation of several features prominent in the soft X-ray (2-4.5 keV) band. We focus on three specific structures: a putative bipolar outflow from the vicinity of Sgr A*; a high surface brightness region located roughl…
Lyman Break and ultraviolet-selected galaxies at z ∼ 1 - II. PACS 100 µm/160 µm FIR detections
Berta, S.; Magnelli, B.; Lutz, D. +53 more
In this work, we report the Photodetector Array Camera and Spectrometer (PACS) 100 µm/160 µm detections of a sample of 42 GALEX-selected and far-infrared (FIR)-detected Lyman break galaxies (LBGs) at z ∼ 1 located in the Cosmic Evolution Survey (COSMOS) field and analyse their ultraviolet (UV) to FIR properties. The detection of these …
VLT/VIMOS observations of an occulting galaxy pair: redshifts and effective extinction curve
Dalcanton, J. J.; Böker, T.; Holwerda, B. W. +2 more
We present Very Large Telescope/Visible Multiobject Spectrograph Integral Field Unit observations of an occulting galaxy pair previously discovered in Hubble Space Telescope (HST) observations. The foreground galaxy is a low-inclination spiral disc, which causes clear attenuation features seen against the bright bulge and disc of the background ga…