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Slow Magnetosonic Solitons Detected by the Cluster Spacecraft
Lavraud, B.; Buchert, S.; Gustafsson, G. +4 more
Experimental evidence is provided for the existence of slow-mode magnetosonic solitons in the collisionless plasma at the magnetopause boundary layer. The solitons were detected by the fleet of Cluster spacecraft at the dusk flank of the magnetosphere as magnetic field depressions (up to 85%) accompanied with enhancement of the plasma density an…
H2 infrared line emission across the bright side of the rho Ophiuchi main cloud
Boulanger, F.; Abergel, A.; Falgarone, E. +3 more
We present imaging and spectroscopic observations of dust and gas (H2) emission, obtained with ISO, from the western edge of the rho Ophiuchi molecular cloud illuminated by the B2 star HD147889 (chi ~ 400). This photodissociation region (PDR) is one of the nearest PDRs to the Sun (d = 135 +/- 15 pc from the stellar parallax) and the lay…
INTEGRAL Spectrometer SPI's GRB detection capabilities. GRBs detected inside SPI's FoV and with the anticoincidence system ACS
Hurley, K.; Hanlon, L.; McBreen, B. +16 more
The spectrometer SPI, one of the two main instruments of the INTEGRAL spacecraft, offers significant gamma-ray burst detection capabilities. In its 35o (full width) field of view SPI is able to localise gamma-ray bursts at a mean rate of ~ 0.8/month. With its large anticoincidence shield of 512 kg of BGO crystals SPI is able to detect g…
Correlation between halo coronal mass ejections and solar surface activity
Wang, Jingxiu; Zhou, Guiping; Cao, Zhuoliang
We survey all the coronal mass ejections (CMEs) observed by the Large Angle and Spectrometric Coronagraph Experiment (LASCO) aboard the Solar Heliospheric Observatory (SOHO) in the interval from 1997 to 2001, and select 197 frontside halo CMEs whose associated near-surface activity could be clearly identified from SOHO EUV Imaging Telescope (EIT) …
The Puzzling Dynamical Status of the Core of the Globular Cluster NGC 6752
Sabbi, E.; Possenti, A.; Origlia, L. +4 more
We have used high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and ground-based wide-field images to determine the center of gravity and construct an extended radial density and brightness profile of the cluster NGC 6752 including, for the first time, detailed star counts in the very inner region. The barycenter of the nine inne…
The First Deep Advanced Camera for Surveys Lyα Images of Local Starburst Galaxies
Östlin, Göran; Leitherer, Claus; Mas-Hesse, J. Miguel +2 more
We report the first results from a deep Lyα imaging program of local starburst galaxies with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. The two observed galaxies ESO 350-IG038 and SBS 0335-052 have luminosities similar to those of the Magellanic Clouds but differ in their chemical composition. ESO 350-IG038 has an oxygen …
XMM-Newton and Chandra Observations of the Galaxy Group NGC 5044. I. Evidence for Limited Multiphase Hot Gas
Buote, David A.; Brighenti, Fabrizio; Mathews, William G. +1 more
Using new XMM and Chandra observations, we present an analysis of the temperature structure of the hot gas within a radius of 100 kpc of the bright nearby galaxy group NGC 5044. A spectral deprojection analysis of data extracted from circular annuli reveals that a two-temperature model (2T) of the hot gas is favored over single-phase or cooling fl…
A Hubble Space Telescope Wide Field Planetary Camera 2 Survey for Brown Dwarf Binaries in the α Persei and Pleiades Open Clusters
Bouy, Hervé; Barrado y Navascués, David; Martín, Eduardo L. +2 more
We present the results of a high-resolution imaging survey for brown dwarf binaries in two open clusters. The observations were carried out with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. Our sample consists of eight brown dwarf candidates in α Persei and 25 brown dwarf candidates in the Pleiades. We have resolved four …
Age Dependence of the Vega Phenomenon: Observations
Waters, L. B. F. M.; Dominik, C.; Waelkens, C. +1 more
We study the time dependency of Vega-like excesses using infrared studies obtained with the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory. We review the different studies published on this issue and critically check and revise ages and fractional luminosities in the different samples. The conclusions of our study differ …
The spiral galaxy M 33 mapped in the FIR by ISOPHOT. A spatially resolved study of the warm and cold dust
Lemke, D.; Völk, H. J.; Klaas, U. +4 more
The Sc galaxy M 33 has been mapped with ISOPHOT in the far-infrared, at 60, 100, and 170 mu m. The spatial resolution of these FIR maps allows the separation of spiral arms and interarm regions and the isolation of a large number of star-forming regions. The spectral energy distribution in the FIR indicates a superposition of two components, a war…