Through an optical campaign performed at 5 telescopes located in the northern and the southern hemispheres, plus archival data from two on line sky surveys, we have obtained optical spectroscopy for 17 counterparts of suspected or poorly studied hard X-ray emitting active galactic nuclei (AGNs) detected with Swift/BAT in order to determine or better classify their nature. We find that 7 sources of our sample are type 1 AGNs, 9 are type 2 AGNs, and 1 object is an X-ray bright optically normal galaxy; the redshifts of these objects lie in a range between 0.012 and 0.286. For all these sources, X-ray data analysis was also performed to estimate their absorption column and to search for possible Compton thick candidates. Among our type 2 obje...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...
Aims.We present the optical classification and redshift of 348 X-ray selected sources from the XMM-...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
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 southern hemisp...
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 ke...
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 4 telescopes located in the northern and the southern hemis...
Surveys above 10 keV represent one of the the best resources to provide an unbiased census of the po...
This paper presents a survey of X-ray-selected active galactic nuclei (AGNs) with optical spectrosco...
We present the combined Chandra and Swift-BAT spectral analysis of nine low-redshift (z <= 0.10), ca...
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to...
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sk...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...
Aims.We present the optical classification and redshift of 348 X-ray selected sources from the XMM-...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemis...
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 southern hemisp...
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 ke...
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 4 telescopes located in the northern and the southern hemis...
Surveys above 10 keV represent one of the the best resources to provide an unbiased census of the po...
This paper presents a survey of X-ray-selected active galactic nuclei (AGNs) with optical spectrosco...
We present the combined Chandra and Swift-BAT spectral analysis of nine low-redshift (z <= 0.10), ca...
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to...
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sk...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...
Aims.We present the optical classification and redshift of 348 X-ray selected sources from the XMM-...
We present optical spectroscopy of candidate active galactic nuclei (AGN) pinpointed by a Swift foll...