Search Publications
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…
An Extreme Solar Event of 20 January 2005: Properties of the Flare and the Origin of Energetic Particles
Kurt, V. G.; Grechnev, V. V.; Chertok, I. M. +9 more
The famous extreme solar and particle event of 20 January 2005 is analyzed from two perspectives. Firstly, using multi-spectral data, we study temporal, spectral, and spatial features of the main phase of the flare, when the strongest emissions from microwaves up to 200 MeV gamma-rays were observed. Secondly, we relate our results to a long-standi…
Solar wind vs magnetosheath turbulence and Alfvén vortices
Alexandrova, O.
In this paper we give firstly a broad review of the space plasma turbulence around the ion characteristic space and temporal scales within two natural laboratories, the solar wind and the Earth magnetosheath. In both regions power law spectra of magnetic fluctuations are observed. In both regions these spectra have a break in the vicinity of the i…
A synchrotron self-Compton scenario for the very high energy γ-ray emission of the radiogalaxy M 87. Unifying the TeV emission of blazars and other AGNs?
Boisson, C.; Sol, H.; Katarzyński, K. +1 more
Context: M 87 is the first extragalactic source detected in the TeV range that is not a blazar. With the increasing performances of ground-based Čerenkov telescopes, we can now probe the variability in the γ-ray flux on small timescales, thus putting strong constraints on the size of the emitting zone. The large scale jet of M 87 is misaligned wit…
Mid-Infrared Spectroscopy of Lensed Galaxies at 1 < z < 3: The Nature of Sources Near the MIPS Confusion Limit
Kneib, J. -P.; Rigby, J. R.; Papovich, C. +10 more
We present Spitzer IRS mid-infrared spectra for 15 gravitationally lensed, 24 µm-selected galaxies, and combine the results with four additional very faint galaxies with IRS spectra in the literature. The median intrinsic 24 µm flux density of the sample is 130 µJy, enabling a systematic survey of the spectral properties of the v…
Hinode EUV spectroscopic observations of coronal oscillations
Erdélyi, R.; Taroyan, Y.
Context: Waves offer a unique opportunity to understand and diagnose the properties of the solar coronal plasma.
Aims: Hinode/EIS observations are analysed to detect wave and oscillatory motions in the solar corona.
Methods: The EIS observations were carried out using a selection of EUV lines. Hinode/XRT images are taken concurrently.
…
Discovery of a bipolar X-ray jet from the T Tauri star DG Tauri
Audard, M.; Güdel, M.; Briggs, K. R. +2 more
Aims:We have obtained and analyzed Chandra ACIS-S observations of the strongly accreting classical T Tauri star DG Tau. Our principal goals are to map the immediate environment of the star to characterize possible extended X-rays formed in the jet, and to re-visit the anomalous, doubly absorbed X-ray spectrum of DG Tau itself.
Methods: We comb…
Another Nonsegregated Blue Straggler Population in a Globular Cluster: the Case of NGC 2419
Dalessandro, E.; Bellazzini, M.; Ferraro, F. R. +3 more
We have used a combination of ACS HST high-resolution and wide-field Subaru data in order to study the blue straggler star (BSS) population over the entire extension of the remote Galactic globular cluster NGC 2419. The BSS population presented here is among the largest ever observed in any stellar system, with more than 230 BSSs in the brightest …