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Near-infrared mapping and physical properties of the dwarf-planet Ceres
Berthier, J.; Carry, B.; Hestroffer, D. +5 more
Aims:We study the physical characteristics (shape, dimensions, spin axis direction, albedo maps, mineralogy) of the dwarf-planet Ceres based on high angular-resolution near-infrared observations.
Methods: We analyze adaptive optics J/H/K imaging observations of Ceres performed at Keck II Observatory in September 2002 with an equivalent spatial…
Energetic ion precipitation at Titan
Krimigis, S. M.; Waite, J. H.; Cravens, T. E. +3 more
Energetic protons and oxygen ions have been observed in Saturn's outer magnetosphere and can precipitate into Titan's atmosphere where they deposit energy, ionize, and drive ionospheric chemistry. Ion production rates caused by this precipitation are calculated using fluxes of incident 27 keV to 4 MeV protons measured by the Cassini MIMI instrumen…
Detailed high-energy characteristics of AXP 4U 0142+61. Multi-year observations with INTEGRAL, RXTE, XMM-Newton, and ASCA
Knödlseder, J.; Kuiper, L.; Hermsen, W. +4 more
4U 0142+61 is one of the Anomalous X-ray Pulsars exhibiting hard X-ray emission above 10 keV discovered with INTEGRAL. In this paper we present detailed spectral and temporal characteristics both in the hard X-ray (>10 keV) and soft X-ray (<10 keV) domains obtained using data from INTEGRAL, XMM-Newton, ASCA and RXTE. Accumulating data collec…
Evaluating the Performance of Solar Flare Forecasting Methods
Leka, K. D.; Barnes, G.
The number of published approaches to solar flare forecasting using photospheric magnetic field observations has proliferated recently, with widely varying claims about how well each works. As different analysis techniques and data sets were used, it is essentially impossible to directly compare the results. A systematic comparison is presented he…
Cosmological parameters from strong gravitational lensing and stellar dynamics in elliptical galaxies
Grillo, C.; Lombardi, M.; Bertin, G.
Context: Observations of the cosmic microwave background, light element abundances, large-scale distribution of galaxies, and distant supernovae are the primary tools for determining the cosmological parameters that define the global structure of the Universe.
Aims: Here we illustrate how the combination of observations related to strong gravi…
PAH Emission from Herbig Ae/Be Stars
Watson, D. M.; Chen, C. H.; Sargent, B. +10 more
We present spectra of a sample of Herbig Ae and Be (HAeBe) stars obtained with the Infrared Spectrograph on Spitzer. All but one of the Herbig stars show emission from PAHs, and seven of the spectra show PAH emission, but no silicate emission at 10 µm. The central wavelengths of the 6.2, 7.7-8.2, and 11.3 µm emission features decrease …
Discovery of the Radio and X-Ray Counterpart of TeV γ-Ray Source HESS J1731-347
Leahy, D. A.; Jiang, B.; Haverkorn, M. +1 more
We discover a faint shell-type radio and X-ray source, G353.6-0.7, associated with HESS J1731-347. G353.6-0.7 is likely an old supernova remnant (SNR), based on radio (0.8, 1.4, and 5 GHz), infrared (8 µm from the GLIMPSE Legacy Project and 21 µm from the Midcourse Space Experiment), and X-ray (0.1-2.4 keV from the ROSAT survey and 5-2…
The Hinode X-Ray Telescope (XRT): Camera Design, Performance and Operations
Weber, M.; Golub, L.; Kano, R. +15 more
The X-ray Telescope (XRT) aboard the Hinode satellite is a grazing incidence X-ray imager equipped with a 2048×2048 CCD. The XRT has 1 arcsec pixels with a wide field of view of 34×34 arcmin. It is sensitive to plasmas with a wide temperature range from < 1 to 30 MK, allowing us to obtain TRACE-like low-temperature images as well as Yohkoh/SXT-…
Radio Emission of Flares and Coronal Mass Ejections. Invited Review
Klein, K. -L.; Nindos, A.; Aurass, H. +1 more
We review recent progress on our understanding of radio emission from solar flares and coronal mass ejections (CMEs) with emphasis on those aspects of the subject that help us address questions about energy release and its properties, the configuration of flare - CME source regions, coronal shocks, particle acceleration and transport, and the orig…
A close look at Saturn's rings with Cassini VIMS
Drossart, Pierre; Nicholson, Philip D.; Hedman, Matthew M. +13 more
Soon after the Cassini-Huygens spacecraft entered orbit about Saturn on 1 July 2004, its Visual and Infrared Mapping Spectrometer obtained two continuous spectral scans across the rings, covering the wavelength range 0.35-5.1 µm, at a spatial resolution of 15-25 km. The first scan covers the outer C and inner B rings, while the second covers…