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Moonlets wandering on a leash-ring
Spahn, F.; Winter, O. C.; Mourão, D. C. +2 more
Since the Voyager flybys, embedded moonlets have been proposed to explain some of the surprising structures observed in Saturn's narrow F ring. Experiments conducted with the Cassini spacecraft support this suggestion. Images of the F ring show bright compact spots, and seven occultations of stars by the F ring, monitored by ultraviolet and infrar…
A massive protostellar core with an infalling envelope
Henning, Th.; Krause, O.; Birkmann, S. M. +3 more
Context: Due to the short timescales involved and observational difficulties, our knowledge of the earliest phases of massive star formation remains incomplete.
Aims: We aim to explore the physical conditions during the initial phases of high-mass star formation and to detect a genuine massive (mass M > 8 M_⊙) protostar at an early evolutio…
Radio tracking of the interplanetary coronal mass ejection driven shock crossed by Ulysses on 10 May 2001
MacDowall, R. J.; Hoang, S.; Lacombe, C. +1 more
We report on the detection of type II radio emission which was observed for more than a day prior to the arrival of an interplanetary shock at Ulysses. We use local spectral emission peaks, computerized from time-averaged intensity spectra of the type II burst, to track the associated emitting shock. In the spectrogram plotted as a function of tim…
The H Lyman- α emission line from the upper atmosphere of Jupiter: Parametric radiative transfer study and comparison with data
Clarke, J.; Ben Jaffel, L.; Kim, Y. J.
This study uses the adding-doubling radiative transfer method in which we take into account the curvature effect of the planetary atmosphere in order to test the sensitivity of the jovian Ly- α emission line in relation to H column density, eddy diffusion coefficient, frequency redistribution function for photon scattering, temperature vertical pr…
Temperature and Density Structures of Solar Corona, A Test of Iron Line Diagnostic Capability of EIS Instrument on Board Hinode
Harra, Louise K.; Doschek, George A.; Hara, Hirohisa +4 more
Increased diagnostic capability of the EUV Imaging Spectrometer (EIS) aboard Hinode (former Solar-B) has been demonstrated with a set of iron emission lines emerging in the two EIS observing wavelength bands (170-210Å and 250-290Å) and their line-intensity ratios. ``Abundance-uncertainty'' free relative emission measure distributions as a function…
C ring fine structures revealed in the thermal infrared
Altobelli, N.; Spilker, L.; Pilorz, S. +4 more
We analyze data sets obtained with the Composite Infrared Spectrometer (CIRS) onboard the Cassini spacecraft after the Saturn Orbit Insertion (SOI). Using the mid-IR interferometer's FP3 channel (600-1100 cm -1), we derive radial temperature profiles for the C ring with a spatial resolution never achieved before. For the first time, the…
Strong lensing analysis of the cluster RCS0224-0002 at z = 0.77
Tozzi, P.; Rosati, P.; Lombardi, M. +2 more
Aims:We present a detailed mass reconstruction of the cluster RCS0224-0002 at z=0.773 from the strong lensing features observed with HST/WFPC2.
Methods: The mass profile is reconstructed using a parametric approach. We introduce a novel method to fit extended multiple images based on the Modified Hausdorff Distance between observed arcs and th…
The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays
Rea, N.; Stappers, B.; Kuiper, L. +5 more
For the first time a quasi-simultaneous multi-wavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the r…
Plasma motions in a short-lived filament related to a magnetic flux cancellation
Romano, P.; Spadaro, D.; Contarino, L. +2 more
Context: In recent years the mechanisms responsible for filament formation and evolution have been investigated by many authors. In particular, the role played by the processes of magnetic flux cancellation in building up or destroying filaments is still a matter of debate.
Aims: In this paper we analyze the evolution of an active region filam…
INTEGRAL and Swift observations of the supergiant fast X-ray transient AX J1845.0-0433 = IGR J18450-0435
Hill, A. B.; Bird, A. J.; Ubertini, P. +8 more
Context: AX J1845.0-0433 was discovered by ASCA in 1993 during fast outburst activity characterized by several flares on short timescales. Up to now, the source was not detected again by any X-ray mission. Its optical counterpart is suggested to be an O9.5I supergiant star, which is the only remarkable object found inside the ASCA error box.
A…