Search Publications
Titan's Ground Reflectance Retrieval from Cassini-Vims Data Taken during the July 2ND, 2004 Fly-By at 2 AM UT
D'Aversa, E.; Orosei, R.; Coradini, A. +5 more
An attempt to evaluate the preliminary values of the Titan's surface albedo at 2 µm from the first Cassini-VIMS observations of the moon is presented. The methodology is based on the application of radiative transfer calculations and a microphysical model of the Titan atmosphere based on fractal aerosol. As a first guess, the surface has bee…
Systematic analysis of X-ray GRB afterglows observed with XMM-Newton and Chandra
Piro, L.; Gendre, B.; Depasquale, M.
We present a sample of GRB afterglows observed in the X-ray band with XMM-Newton or Chandra, focusing on the brightest events. We have derived for this sample the temporal slope and the spectral index of the continuum, and used closure relationships to discriminate the afterglow environment for each burst. We show that jet features are excluded mo…
AGNS and MICROQUASARS As High-Energy γ-Ray Sources
Paredes, Josep M.
The extragalactic analogs of the microquasars, the quasars, are strong γ-ray emitters at GeV energies. It is expected that microquasars are also γ-ray sources, because of the analogy with quasars and because theoretical models predict the high-energy emission. There are two microquasars that appear as the possible counterparts for two unidentified…
Extended very cold dust in the interacting HI ring galaxy pair NGC 2293 / 2292
Krause, O.; Barnes, D.; Stickel, M.
The LGG 138 galaxy group members NGC 2292 and NGC 2293 were imaged with ISOPHOT in the far-infrared (FIR) at {60 µ m}, {100 µ m}, and {200 µ m}. While no FIR emission is seen at {60 µ m}, and only very low level emission is present at {100 µ m}, compact FIR emission from both NGC 2292 and NGC 2293 galaxy centres and e…
Ion cyclotron waves in the Saturnian magnetosphere associated with Cassini's engine exhaust
Russell, C. T.; Dougherty, M. K.; Khurana, K. K. +3 more
Five hours after the orbit insertion maneuver that placed Cassini into orbit about Saturn, a long (90 minute) burst of ion cyclotron waves were seen, very different than any waves on the inbound leg of the orbit or on succeeding orbits. The ion cyclotron waves were left-hand elliptically polarized and propagating at a moderately large angle to the…
Multipoint Analysis of the Temporal Scale of Bursty Bulk Flow Events during the Quiet Time of Magnetotail
Dandouras, I.; Reme, H.; Cao, Jin-Bin +3 more
A series of Bursty Bulk Flow events (BBFs) were observed by CLUSTER satellites during the quiet time of the magnetotail in 2001. The data of multi-satellites of CLUSTER show that the duration of BBFs observed by multi-satellites is longer than that of BBFs previously observed by single satellite. The duration of multi-satellites is about twice tha…
ISO observations of the interacting galaxy Markarian 297. with the powerful supernova remnant 1982aa
Hanlon, L.; McBreen, B.; Clavel, J. +10 more
Markarian (Mkn) 297 is a complex system comprised of two interacting galaxies that has been modelled with a variety of scenarios. Observations of this system were made with the Infrared Space Observatory (ISO) using the ISOCAM, ISOPHOT and LWS instruments. ISOCAM maps at 6.7 µm, 7.7 µm, 12 µm and 14.3 µm are presented which…
Spatial structure of beamlets according to Cluster observations
Zelenyi, L. M.; Sauvaud, J. -A.; Dunlop, M. W. +4 more
Beamlets are sporadic bursty ion beams with energies about 10-30 keV observed in the lobes - plasma sheet interface. To investigate the spatial structure of this phenomenon we used Cluster data for the fall and summer of 2001 time interval. Both case study and statistical study have been performed. At a later stage of statistical study Interball d…
The INTEGRAL HESS/MAGIC connection: A new class of cosmic high energy accelerators from keV to TeV
Ubertini, P.
The recent completion and operation of the High Energy Stereoscopic System [1], an array of ground based imaging Cherenkov telescopes, has provided a survey with unprecedented sensitivity of the inner part of the Galaxy and revealed a new population of very high energy gamma-rays sources emitting at E > 100 GeV. Most of them were reported to ha…
The XMM-Newton/2dF survey - VIII. The extended X-ray sources
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +2 more
We present a sample of eight extended X-ray sources detected in the wide-field (~2.3 deg2), bright (2-10 ks) XMM-Newton/2dF survey, reaching a flux limit of ~2 × 10-14 erg s-1 cm-2. Of these, seven are identified as secure X-ray clusters in the soft 0.3-2 keV band using a standard wavelet algorithm on ei…