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15 papers · 2 filters
INTEGRAL and XMM-Newton Observations of GRB040106
L. Moran, S. Mereghetti, D. Gotz +10
On January 6th 2004, the IBAS burst alert system triggered the 8th gamma-ray burst (GRB) to be located by the INTEGRAL satellite. The position was determined and publicly distribut…
Helical motion and the origin of QPO in blazar-type sources
Frank M. Rieger
Recent observations and analysis of blazar sources provide strong evidence for (i) the presence of significant periodicities in their lightcurves and (ii) the occurrence of helical…
Gamma-ray bursts and X-ray melting of material as a potential source of chondrules and planets
P. Duggan, B. McBreen, A. J. Carr +4
The intense radiation from a gamma-ray burst (GRB) is shown to be capable of melting stony material at distances up to 300 light years which subsequently cool to form chondrules. T…
On the geometrical origin of periodicity in blazar-type sources
Frank M. Rieger
Periodicities in blazar light curves may be related to helical trajectories in extragalactic radio jets by differential Doppler boosting effects. We consider ballistic and non-ball…
Shear acceleration in relativistic astrophysical jets
Frank M. Rieger, Peter Duffy
We consider the acceleration of energetic particles by a velocity shear in the relativistic background flow containing scattering centers. Three possible acceleration sites for ast…
An ISOCAM survey through gravitationally lensing galaxy clusters. III. New results from mid-infrared observations of th e cluster Abell 2219
D. Coia, L. Metcalfe, B. McBreen +7
The massive cluster of galaxies Abell 2219 (z = 0.228) was observed at 14.3 m with the Infrared Space Observatory and results were published by Barvainis et al. (1999). These ob…