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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.…
Condensate clouds in Titan's north polar stratosphere
Samuelson, Robert E.; Mayo, Louis A.
Analysis of the 250-560 cm -1 spectral continuum of Titan's north polar hood just after spring equinox reveals, in addition to the ubiquitous aerosol, a tenuous but relatively uniform cloud of small particles permeating the lower stratosphere at altitudes between 58 and 90 km. Voyager 1 IRIS data suggest the particles are highly scatter…
3-200 keV Spectral States and Variability of the INTEGRAL Black Hole Binary IGR J17464-3213
Capitanio, F.; Bird, A. J.; Ubertini, P. +12 more
On March 2003, IBIS, the gamma-ray imager on board the INTEGRAL satellite, detected an outburst from a new source, IGR J17464-3213, that turned out to be a HEAO 1 transient, H1743-322. In this paper we report on the high-energy behavior of this black hole candidate (BHC) studied with the three main instruments on board INTEGRAL. The data, collecte…
The opacity of spiral galaxy disks. VI. Extinction, stellar light and color
Holwerda, B. W.; Allen, R. J.; van der Kruit, P. C. +1 more
In this paper we explore the relation between dust extinction and stellar light distribution in disks of spiral galaxies. Extinction influences our dynamical and photometric perception of disks, since it can distort our measurement of the contribution of the stellar component. To characterize the total extinction by a foreground disk, González et …
Plasmoid in the high latitude boundary/cusp region observed by Cluster
Balogh, A.; Glassmeier, K. -H.; Zhang, H. +8 more
A plasmoid-like structure without a core magnetic field has been observed by Cluster spacecraft in the high latitude magnetopause region when the interplanetary magnetic field (IMF) is northward and has a dominant duskward component. Bursty electrons and ions are found to be well confined in this plasmoid-like structure. The structure possesses a …
INTEGRAL high energy observations of 2S 0114+65
Bonning, E. W.; Falanga, M.
We report the first INTEGRAL timing and spectral analysis of the high mass X-ray binary source 2S 0114+65 at high energies (5-100 keV). The pulse period was found at 2.668 h with a high pulsed fraction, 80% in both the 20-40 keV and 40-80 keV energy bands. The spin-up trend over 8 years was measured to be dot P = -8.9 × 10-7 s s-1<…
Evidence of an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C 74.26
Fabian, A. C.; Ballantyne, D. R.
We present evidence of a broad ionized Fe Kα line in the XMM-Newton spectrum of the broad-line radio galaxy (BLRG) 4C 74.26. This is the first indication that the innermost regions of the accretion flow in BLRGs contain thin, radiatively efficient disks. Analysis of the 35 ks XMM-Newton observation finds a broad line with an inner radius close to …