Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or XMM-European Photon Imaging Camera (EPIC) which not only allow us to pinpoint their optical counterpart, but also study their X-ray spectral properties (column density, power law photon index, and F 2-10 keV flux). We find that 28 sources in our sample are active galactic nuclei (AGNs); 7 are clas...
Within the framework of our program (running since 2004) of identification of hard X-ray INTEGRAL so...
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to...
sing 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky ...
Through an optical campaign performed at four telescopes located in the northern and the southern he...
Through an optical campaign performed at four telescopes located in the northern and the s...
Through an optical campaign performed at four telescopes located in the northern and southern hemisp...
Through an optical campaign performed at four telescopes located in the northern and southern hemisp...
Through an optical campaign performed at 4 telescopes located in the northern and the southern hemis...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the B...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 ke...
Within the framework of our program (running since 2004) of identification of hard X-ray INTEGRAL so...
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to...
sing 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky ...
Through an optical campaign performed at four telescopes located in the northern and the southern he...
Through an optical campaign performed at four telescopes located in the northern and the s...
Through an optical campaign performed at four telescopes located in the northern and southern hemisp...
Through an optical campaign performed at four telescopes located in the northern and southern hemisp...
Through an optical campaign performed at 4 telescopes located in the northern and the southern hemis...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the B...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy cam...
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 ke...
Within the framework of our program (running since 2004) of identification of hard X-ray INTEGRAL so...
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to...
sing 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky ...