2.7k citations
- National Institute for AstrophysicsIT1.8k papers
- Centre National de la Recherche ScientifiqueFR1k papers
- Astronomical Observatory of RomeIT946 papers
- Osservatorio Astronomico di PadovaIT728 papers
- Max Planck Institute for Extraterrestrial PhysicsDE648 papers
- University of PaduaIT641 papers
- Trieste Astronomical ObservatoryIT604 papers
- Goddard Space Flight CenterUS585 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR565 papers
- University of BolognaIT539 papers
- Astronomical Observatory of CapodimonteIT521 papers
- European Southern ObservatoryCL517 papers
28 papers · 1 filter
Extreme synchrotron blazars: the case of Mkn 501
G. Ghisellini
BeppoSAX observations of Mkn501 in April 1997 (Pian et al. 1998), have revealed an extraordinary X-ray emission from this BL Lac object, during a phase of high activity at TeV ener…
BeppoSAX observations of PKS 0528+134
G. Ghisellini, G. Tagliaferri, L. Costamante +25
We report on the BeppoSAX observations of the gamma-ray blazar PKS 0528+134 performed in Feb and Mar 1997, during a multiwavelength campaign involving EGRET and ground based telesc…
Thermalization by synchrotron absorption in compact sources: electron and photon distributions
G. Ghisellini, F. Haardt, R. Svensson
The high energy continuum in Seyfert galaxies and galactic black hole candidates is likely to be produced by a thermal plasma. There are difficulties in understanding what can keep…
Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
A. E. Wehrle, E. Pian, C. M. Urry +3
The blazar 3C 279, one of the brightest identified extragalactic objects in the gamma-ray sky, underwent a flare of a factor 10 amplitude in gamma-rays towards the end of a 3-week…
High Energy Break and Reflection Features in the Seyfert Galaxy MCG+8-11-11
P. Grandi, F. Haardt, G. Ghisellini +3
We present the results from ASCA and OSSE simultaneous observations of the Seyfert 1.5 galaxy MCG+8-11-11 performed in August-September 1995. The ASCA observations indicate a modes…
Is the Universe Homogeneous? (On Large Scales)
Luigi Guzzo
I critically discuss in a pedagogical and phenomenological way a few crucial tests challenging the claims by Pietronero and collaborators that there is no evidence from available g…