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The Ultraluminous X-ray Sources NGC 1313 X-1 and X-2
R. Turolla, P. Mucciarelli, L. Zampieri +3
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the nearby spiral galaxy NGC 1313: NGC 1313 X-1 and X-2. The spectral continuum of…
On the Unpulsed Radio Emission from J0737-3039
R. Turolla A. Treves
The double pulsar system J0737-3039 appears associated with a continuous radio emission, nearly three times stronger than that of the two pulsars together. If such an emission come…
Spectroscopy of BL Lac Objects: new redshifts and mis-identified sources
N. Carangelo, R. Falomo, J. Kotilainen +2
We are carrying out a program of high signal to noise optical spectroscopy of BL Lacs with unknown or tentative redshift. Here we report some preliminary results. New redshifts are…
Spectral Energy Distributions of 3C 279 revisited: BeppoSAX observations and variability models
L. Ballo, L. Maraschi, F. Tavecchio +9
We present the BeppoSAX observations of 3C 279 performed in 1997 January 13-23 simultaneously with gamma-ray pointings with EGRET on board CGRO and optical observations at the Tori…
Extreme synchrotron BL Lac objects
L. Costamante, G. Ghisellini, P. Giommi +8
We performed an observational program with the X-ray satellite BeppoSAX to study objects with extreme synchrotron peak frequencies (nu_peak > 1 keV). Of the seven sources observed,…
Magnetized Atmospheres around Accreting Neutron Stars
S. Zane, R. Turolla, A. Treves
We present a detailed investigation of atmospheres around accreting neutron stars with high magnetic field ( G) and low luminosity ( erg/s). We…