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Deceleration from Entrainment in the jet of the quasar 1136-135?
F. Tavecchio, L. Maraschi, R. M. Sambruna +4
Modeling the multiwavelength emission of successive regions in the jet of the quasar PKS 1136-135 we find indication that the jet suffers deceleration near its end on a (deprojecte…
Cosmological constraints with GRBs: homogeneous medium vs wind density profile
G. Ghirlanda, G. Ghisellini, C. Firmani +3
We present the constraints on the cosmological parameters obtained with the -- correlation found with the most recent sample of 19 GRBs with spectroscopically me…
On the interpretation of the spectral--energy correlations in long Gamma--Ray Bursts
L. Nava, G. Ghisellini, G. Ghirlanda +2
Recently, Liang & Zhang (2005) found a tight correlation involving only observable quantities, namely the isotropic emitted energy , the energy of the peak of the prompt…
Deep Chandra and multicolor HST follow-up of the jets in two powerful radio quasars
R. Sambruna, M. Gliozzi, D. Donato +5
We present deep (70-80 ks) Chandra and multicolor HST ACS images of two jets hosted by the powerful quasars 1136-135 and 1150+497, together with new radio observations. The sources…
The XMM-Newton view of gamma-ray loud active nuclei
L. Foschini, G. Ghisellini, C. M. Raiteri +8
Notwithstanding the big efforts devoted to the investigation of the mechanisms responsible for the high-energy (E>100 MeV) gamma-ray emission in active galactic nuclei (AGN), the d…
Spitzer IRAC Imaging of the Relativistic Jet from Superluminal Quasar PKS 0637-752
Y. Uchiyama, C. M. Urry, J. Van Duyne +5
Emission from the relativistic jet located at hundreds of kpc from the core of the superluminal quasar PKS 0637-752 was detected at 3.6 and 5.8 microns with the Infrared Array Came…
A search for Warm-Hot Intergalactic Medium features in the X-ray spectra of Mkn 421 with the XMM-Newton RGS
M. Ravasio, G. Tagliaferri, A. M. T. Pollock +2
We present the high-resolution X-ray spectra of Mkn 421 obtained in November 2003 with the RGS aboard the XMM-Newton satellite. This Target of Opportunity observation was triggered…