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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…
X-Ray Spectral Variability during an Outburst in V1118 Ori
Audard, M.; Güdel, M.; Briggs, K. R. +5 more
We present results from a multiwavelength campaign to monitor the 2005 outburst of the low-mass young star V1118 Ori. Although our campaign covers the X-ray, optical, infrared, and radio regimes, we focus in this Letter on the properties of the X-ray emission in V1118 Ori during the first few months after the optical outburst. Chandra and XMM-Newt…
INTEGRAL observations of the field of the BL Lacertae object S5 0716+714
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +29 more
We have performed observations of the blazar S5 0716+714 with INTEGRAL on 2-6 April 2004. In the first months of 2004, the source had increased steadily in optical brightness and had undergone two outbursts. During the latter outburst, that occurred in March, it reached the extreme level of R = 12.1 mag, which triggered our INTEGRAL program. The t…
Plasma electrons above Saturn's main rings: CAPS observations
Lewis, G. R.; Coates, A. J.; Tokar, R. L. +8 more
We present observations of thermal (~0.6-100eV) electrons observed near Saturn's main rings during Cassini's Saturn Orbit Insertion (SOI) on 1 July 2004. We find that the intensity of electrons is broadly anticorrelated with the ring optical depth at the magnetic footprint of the field line joining the spacecraft to the rings. We see enhancements …
The Double Star Plasma Electron and Current Experiment
Kataria, D. O.; Wilson, R. J.; Fazakerley, A. N. +16 more
The Double Star Project is a collaboration between Chinese and European space agencies, in which two Chinese magnetospheric research spacecraft, carrying Chinese and European instruments, have been launched into equatorial (on 29 December 2003) and polar (on 25 July 2004) orbits designed to enable complementary studies with the Cluster spacecraft.…