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HETE Observations of the Gamma-Ray Burst GRB 030329: Evidence for an Underlying Soft X-Ray Component
Sakamoto, T.; Hurley, K.; Boer, M. +30 more
An exceptionally intense gamma-ray burst, GRB 030329, was detected and localized by the instruments on board the High Energy Transient Explorer satellite (HETE) at 11:37:14 UT on 2003 March 29. The burst consisted of two ~10 s pulses of roughly equal brightness and an X-ray tail lasting more than 100 s. The energy fluence in the 30-400 keV energy …
The ISOPHOT - MAMBO survey of 3CR radio sources: Further evidence for the unified schemes
Meisenheimer, K.; Siebenmorgen, R.; Krause, O. +9 more
We present the complete set of ISOPHOT observations of 3CR radio galaxies and quasars, which are contained in the ISO Data Archive, providing 75 mid- and far-infrared spectral energy distributions (SEDs) between 5 and 200 µm. For 28 sources they are supplemented with MAMBO 1.2 mm observations and for 15 sources with new submillimetre data fr…
Thermal and Nonthermal X-Rays from the Large Magellanic Cloud Superbubble 30 Doradus C
Ueno, Masaru; Koyama, Katsuji; Nakajima, Hiroshi +1 more
We report on the discovery of thermal and nonthermal X-rays from the shells of the superbubble (SB) 30 Dor C in the LMC. The X-ray morphology is a nearly circular shell with a radius of ~40 pc, which is bright on the northern and western sides. The spectra of the shells differ from region to region. The southern shell shows clear emission lines an…
Hypernovae/Gamma-Ray Bursts in the Galactic Center as Possible Sources of Galactic Positrons
Schanne, S.; Cordier, B.; Paul, J. +1 more
The observation of a strong and extended positron-electron line annihilation emission in the central regions of the Galaxy by the SPectrometer on the International Gamma-Ray Astrophysical Laboratory (INTEGRAL/SPI), consistent with the Galactic bulge geometry and without any counterpart in the gamma-ray range, neither at high energy nor in the 1809…
The XMM-NEWTON Ω project. I. The X-ray luminosity-temperature relation at z>0.4
Bartlett, J. G.; Giard, M.; Nichol, R. C. +9 more
We describe XMM-Newton Guaranteed Time observations of a sample of eight high redshift (0.45<z<0.62) clusters. The goal of these observations was to measure the luminosity and the temperature of the clusters to a precision of ∼10%, leading to constraints on the possible evolution of the luminosity-temperature (Lx-Tx) re…
Key parameters of W UMa-type contact binaries discovered by HIPPARCOS
Selam, S. O.
A sample of W UMa-type binaries which were discovered by the HIPPARCOS satellite was constructed with the aid of well defined selection criteria described in this work. The selection process showed up that several systems of which the variability types have been assigned as EB in HIPPARCOS catalogue are genuine contact binaries of W UMa-type. The …
Helicity of magnetic clouds and their associated active regions
Pevtsov, Alexei A.; Leamon, Robert J.; Canfield, Richard C. +3 more
In this work we relate the magnetic and topological parameters of twelve interplanetary magnetic clouds to associated solar active regions. We use a cylindrically symmetric constant-α force-free model to derive field line twist, total current, and total magnetic flux from in situ observations of magnetic clouds. We compare these properties with th…
Rings in the haloes of planetary nebulae
Corradi, R. L. M.; Sánchez-Blázquez, P.; Mellema, G. +2 more
We present a search for rings or arcs in the haloes of planetary nebulae (PNe). We discovered such structures in eight PNe, tripling the sample of PNe with known rings. This shows that, contrary to what was believed to date, the occurrence of mass loss fluctuations with timescales of 102-103 yrs at the end of the asymptotic g…
The Ultraluminous X-Ray Source NGC 1313 X-2 (MS 0317.7-6647) and Its Environment
Kaaret, Philip; Turolla, Roberto; Zampieri, Luca +5 more
We present new optical and Chandra observations of the field containing the ultraluminous X-ray source NGC 1313 X-2. On an ESO 3.6 m image, the Chandra error box embraces an R=21.6 pointlike object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is ~500. The value of fX/f
Helioseismology of Time-Varying Flows Through The Solar Cycle
Gizon, Laurent
Flows in the upper convection zone are measured by helioseismology on a wide variety of scales. These include differential rotation and meridional circulation, local flows around complexes of magnetic activity and sunspots, and convective flows. The temporal evolution of flows through cycle 23 reveals connections between mass motions in the solar …