Search Publications

Size and shape of ULF waves in the terrestrial foreshock

Balogh, A.; Dandouras, I.; Horbury, T. S. +3 more

Using simultaneous four spacecraft data, estimates of the size and shape of ULF waves in the terrestrial foreshock are presented. Estimates of the size of the waves in different directions are obtained by calculating the spatial autocorrelation function of the magnetic field in the wave frame using cross-correlations of magnetic field measurements…

Dust properties of UV bright galaxies at z ~ 2

Noll, S.; Pierini, D.

We investigate the properties of the extinction curve in the rest-frame UV for a sample of 34 UV-luminous galaxies at 2 < z < 2.5, selected from the FORS Deep Field (FDF) spectroscopic survey. A new parametric description of the rest-frame UV spectral energy distribution is adopted; its sensitivity to properties of the stellar populations or…

Magnetopause Processes

Escoubet, C. P.; Vaivads, A.; Fuselier, S. A. +7 more

CLASS B2108+213: a new wide-separation gravitational lens system

Pearson, T. J.; McKean, J. P.; Treu, T. +15 more

We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz shows two compact components separated by 4.56 arcsec with a faint third component in between which we believe is emission from a lensing galaxy. 5-GHz…

An XMM-Newton observation of Abell 2597

Fabian, A. C.; Morris, R. Glenn

We report on a 120-ks XMM-Newton observation of the galaxy cluster Abell 2597 (A2597). Results from both the European Photon Imaging Camera (EPIC) and the Reflection Grating Spectrometer (RGS) are presented. From EPIC we obtain radial profiles of temperature, density and abundance, and use these to derive cooling time and entropy. We illustrate co…

Absorption-Line Study of Halo Gas in NGC 3067 toward the Background Quasar 3C 232

Stocke, John T.; Keeney, Brian A.; Tumlinson, Jason +2 more

We present new H I 21 cm absorption data and ultraviolet spectroscopy from Hubble Space Telescope/Space Telescope Imaging Spectrograph of the QSO/galaxy pair 3C 232/NGC 3067. The QSO sight line lies near the minor axis and 1.8 arcmin (11 h^-1₇₀ kpc) above the plane of NGC 3067, a nearby luminous (cz=1465+/-5 km s^-1,…

1E 1740.7-2942: Temporal and spectral evolution from INTEGRAL and RXTE observations

Capitanio, F.; Bird, A. J.; Ubertini, P. +13 more

We present results of the monitoring of the black hole candidate 1E 1740.7-2942 with INTEGRAL, in combination with simultaneous observations by RXTE. We concentrate on broad-band spectra from INTEGRAL/IBIS and RXTE/PCA instruments. During our observations, the source spent most of its time in the canonical low/hard state with the measured flux var…

Far-Ultraviolet Observations of the Globular Cluster NGC 2808 Revisited: Blue Stragglers, White Dwarfs, and Cataclysmic Variables

Knigge, C.; Long, K. S.; Zurek, D. R. +2 more

We present a reanalysis of far-ultraviolet (FUV) observations of the globular cluster NGC 2808 obtained with the Hubble Space Telescope. These data were first analyzed by Brown and coworkers, with an emphasis on the bright, blue horizontal-branch (HB) stars in this cluster. Here, our focus is on the population of fainter FUV sources, which include…

The Heliospheric He II 30.4 nm Solar Flux During Cycle 23

Auchère, F.; von Steiger, R.; Witte, M. +3 more

Because of the orbit characteristics of the vast majority of spacecraft, the solar flux has predominantly been measured at Earth or at least in the plane of the ecliptic. Therefore, the existing data do not directly demonstrate the fact that the latitudinal distribution of the extreme-ultraviolet (EUV) solar flux is largely anisotropic. Indeed, in…

Magnetic Helicity Injection and Sigmoidal Coronal Loops

Kusano, K.; Sakurai, T.; Yokoyama, T. +2 more

We studied the relationship between magnetic helicity injection and the formation of sigmoidal loops. We analyzed seven active regions: three regions showed coronal loops similar to the potential field, and four regions showed the sigmoidal loops. The magnetic helicity injection rate was evaluated using the method proposed by Kusano et al. In orde…