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- National Institute for AstrophysicsIT287 papers
- Astronomical Observatory of RomeIT278 papers
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4 papers · 1 filter
An improvement of the BeppoSAX LECS and MECS positioning accuracy
M. Perri, M. Capalbi
We present a study of the source positioning accuracy of the LECS and MECS instruments on-board BeppoSAX. From the analysis of a sample of archival images we find that a systematic…
BeppoSAX Observations of Synchrotron X-ray Emission from Radio Quasars
P. Padovani, L. Costamante, G. Ghisellini +2
We present new BeppoSAX LECS, MECS, and PDS observations of four flat-spectrum radio quasars (FSRQ) having effective spectral indices alpha_ro and alpha_ox typical of high-energy p…
The identification of the optical/IR counterpart of the 15.8-s transient X-ray pulsar XTE J1946+274
F. Verrecchia, G. L. Israel, I. Negueruela +7
We report on the discovery of the optical/IR counterpart of the 15.8s transient X-ray pulsar XTE J1946+274. We re-analysed archival BeppoSAX observations of XTE J1946+274, obtainin…
The classification of BL Lacertae objects: the Ca H&K break
H. Landt, P. Padovani, P. Giommi
We investigate why BL Lacertae objects (BL Lacs) have values of the Ca H&K break (a stellar absorption feature) lower than low-power radio galaxies and if its use is justified to s…