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Cassini Imaging of Jupiter's Atmosphere, Satellites, and Rings
Dones, Luke; West, Robert A.; Porco, Carolyn C. +21 more
The Cassini Imaging Science Subsystem acquired about 26,000 images of the Jupiter system as the spacecraft encountered the giant planet en route to Saturn. We report findings on Jupiter's zonal winds, convective storms, low-latitude upper troposphere, polar stratosphere, and northern aurora. We also describe previously unseen emissions arising fro…
XMM-Newton Observations of the Perseus Cluster. I. The Temperature and Surface Brightness Structure
Böhringer, H.; Churazov, E.; Forman, W. +1 more
We present preliminary results of a XMM-Newton 50 ks observation of the Perseus Cluster that provides an unprecedented view of the central 0.5 Mpc region. The projected gas temperature declines smoothly by a factor of 2 from a maximum value of ~ 7 keV in the outer regions to just above 3 keV at the cluster center. Over this same range, the heavy-e…
Spatio-temporal structure of storm-time chorus
Gurnett, D. A.; Pickett, J. S.; Parrot, M. +2 more
We discuss chorus emissions measured by the four Cluster spacecraft at close separations during a geomagnetically disturbed period on 18 April 2002. We analyze the lower band of chorus below one half of the electron cyclotron frequency, measured at a radial distance of 4.4 Earth's radii, within a 2000 km long source region located close to the equ…
3D mapping of the dense interstellar gas around the Local Bubble
Crifo, F.; Lallement, R.; Welsh, B. Y. +2 more
We present intermediate results from a long-term program of mapping the neutral absorption characteristics of the local interstellar medium, motivated by the availability of accurate and consistent parallaxes from the Hipparcos satellite. Equivalent widths of the interstellar NaI D-line doublet at 5890 Å are presented for the lines-of-sight toward…
A Wide-Field Hubble Space Telescope Study of the Cluster Cl 0024+16 at z = 0.4. I. Morphological Distributions to 5 Mpc Radius
Treu, Tommaso; Smail, Ian; Ellis, Richard S. +5 more
We describe a new wide-field Hubble Space Telescope survey of the galaxy cluster Cl 0024+16 (z~0.4) consisting of a sparsely sampled mosaic of 39 Wide Field Planetary Camera 2 images that extends to a cluster radius of ~5 Mpc. Together with extensive ground-based spectroscopy taken from the literature, augmented with over a hundred newly determine…
The INTEGRAL Science Data Centre (ISDC)
Strong, A. W.; Mereghetti, S.; Paltani, S. +17 more
The INTEGRAL Science Data Centre (ISDC) provides the INTEGRAL data and means to analyse them to the scientific community. The ISDC runs a gamma ray burst alert system that provides the position of gamma ray bursts on the sky within seconds to the community. It operates a quick-look analysis of the data within few hours that detects new and unexpec…
A Low-Mass Central Black Hole in the Bulgeless Seyfert 1 Galaxy NGC 4395
Filippenko, Alexei V.; Ho, Luis C.
NGC 4395 is one of the least luminous and nearest known type 1 Seyfert galaxies, and it also lacks a bulge. We present a Hubble Space Telescope (HST) I-band image of its nuclear region and Keck high-resolution (~8 km s-1) echelle spectra containing the Ca II near-infrared triplet. In addition to the unresolved point source, there is a n…
Prominence Eruptions and Coronal Mass Ejection: A Statistical Study Using Microwave Observations
Howard, R. A.; Gopalswamy, N.; Shibasaki, K. +3 more
We present the results of a statistical study of a large number of solar prominence events (PEs) observed by the Nobeyama Radioheliograph. We studied the association rate, relative timing, and spatial correspondence between PEs and coronal mass ejections (CMEs). We classified the PEs as radial and transverse, depending on whether the prominence mo…
Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy
Strong, A. W.; Gehrels, N.; Knödlseder, J. +18 more
We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account the range of spatial distribution models which are consistent with the data, we derive a flux of 9.9+4.7…
The Cosmic Lens All-Sky Survey - II. Gravitational lens candidate selection and follow-up
Pearson, T. J.; McKean, J. P.; Blandford, R. D. +19 more
We report the final results of the search for gravitationally lensed flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All-Sky Survey) and JVAS (Jodrell Bank VLA Astrometric Survey). VLA (Very Large Array) observations of 16503 sources have been made, resulting in the largest sample of arcsec-scale lens systems available. …