5 papers · 1 filter
ROXA J081009.9+384757.0: a erg/s blazar with hard X-ray synchrotron peak or a new type of radio loud AGN?
P. Giommi, E. Massaro, P. Padovani +10
We report the discovery of ROXA J081009.9+384757.0 = SDSS J081009.9+384757.0, a z=3.95 blazar with a highly unusual Spectral Energy Distribution (SED). This object was first notice…
Swift and infra-red observations of the blazar 3C~454.3 during the giant X-ray flare of May 2005
P. Giommi, A. J. Blustin, M. Capalbi +16
We present the results of a series of Swift and quasi simultaneous ground-based infra-red observations of the blazar 3C 454.3 carried out in April-May 2005 when the source was 10 t…
The Intra-Night Optical Variability of the bright BL Lac object S5 0716+714
F. Montagni, A. Maselli, E. Massaro +3
We address the topic of the Intra-Night Optical Variability of the BL Lac object S5 0716+714. To this purpose a long term observational campaign was performed, from 1996 to 2003, w…
Log-parabolic spectra and particle acceleration in blazars - II: The BeppoSAX wide band X-ray spectra of Mkn 501
E. Massaro, M. Perri, P. Giommi +2
We present the results of a spectral and temporal study of the complete set of BeppoSAX NFI (11) and WFC (71) observations of the BL Lac object Mkn 501. The WFC 2-28 keV data, repo…
BL Lacertae: the multiwavelength campaign of 2000
M. Ravasio, G. Tagliaferri, G. Ghisellini +9
We present two BeppoSAX observations of BL Lacertae as part of a multiwavelength radio-to-TeV campaign. During the first observation we observe a faint Compton spectrum, while duri…