236 citations · 1.8k across the 32 of their papers we have counts for
6 papers · 2 filters
Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources
N. Masetti, P. Parisi, E. Palazzi +17
(abridged) Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to 30%) of unidentified objects among the detected sources. Here we con…
XMM-Newton observations of unidentified INTEGRAL/IBIS sources
A. Malizia, L. Bassani, V. Sguera +4
About 30% of the sources in the 4th INTEGRAL-IBIS catalogue are unidentified in that they lack an optical counterpart. To be able to classify them, X-ray observations are of crucia…
Using the Rosat Catalogue to find Counterparts for Unidentified Objects in the 1st Fermi/LAT Catalogue
J. B. Stephen, L. Bassani, R. Landi +4
There are a total of 1451 gamma-ray emitting objects in the Fermi Large Area Telescope First Source Catalogue. The point source location accuracy of typically a few arcminutes has…
Swift/XRT follow-up observations of unidentified INTEGRAL/IBIS sources
R. Landi, L. Bassani, A. Malizia +4
Many sources listed in the 4th IBIS/ISGRI survey are still unidentified, i.e. lacking an X-ray counterpart or simply not studied at lower energies (< 10 keV). The cross-correlation…
Re-evaluating the Local Compton-thick AGN Fraction
A. Malizia, J. B. Stephen, L. Bassani +3
We study the NH distribution in a complete sample of 88 AGN selected in the 20-40 keV band from INTEGRAL/IBIS observations. We find that the fraction of absorbed (NH > 10^22 cm^-2)…
Revealing the nature of new unidentified INTEGRAL sources
N. Masetti, P. Parisi, E. Palazzi +17
Since its launch on October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detectio…