4 papers · 1 filter
The broad-band spectrum of OAO1657-415 with BeppoSAX: In search of cyclotron lines
M. Orlandini, D. Dal Fiume, S. Del Sordo +4
We report on a 30 ks observation of the high-mass X-ray binary pulsar OAO1657-415 performed by BeppoSAX on September 1998. The wide band spectrum is well fit by both a cutoff power…
The quiescent state broadband X-ray spectrum and variability of Mkn421
M. Guainazzi, G. Vacanti, A. Malizia +3
The BL Lac object Mkn~421 was observed three times by the X-ray observatory BeppoSAX in consecutive days during 1997 April and May. The source was in a quiescent state, with an ave…
COMPTEL Observations of 3C 279 during the first 4 Years of the CGRO-Mission
W. Collmar, J. J. Blom, K. Bennett +6
The COMPTEL experiment aboard the Compton Gamma-Ray Observatory (CGRO) has observed the gamma-ray blazar 3C 279 several times between April 1991 and September 1995. This paper repo…
COMPTEL observations of the quasar PKS 0528+134 during the first 3.5 years of the CGRO mission
W. Collmar, K. Bennett, H. Bloemen +9
The COMPTEL observations of the blazar-type quasar PKS 0528+134 in the energy range 0.75 MeV to 30 MeV carried out between April 1991 and September 1994 have been analyzed. During…