2009/09/30 by P. Parisi, N. Masetti, E. Jiménez-Bailón +16 · 1 citation
Physics and Astronomy · #Absorption (acoustics) #Active galactic nucleus #Astronomy and Astrophysical Research #BL Lac object #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Line (geometry) #Quasar #Redshift #Sky #Spectroscopy #astro-ph.CO
paper · pdf · doi:10.1051/0004-6361/200912931
15 pages, 7 figures, 4 tables. Accepted for publication on Astronomy & Astrophysics, main journal. The name of the source Swift J0519.5-3140 corrected with Swift J0501.9-3239
openalex publication_date 2009/10/01 · arxiv created 2009/10/02 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 <i>Swift<i/>/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 objects, we did not find any clear Compton thick AGN, but at least 6 out of 9 of them are highly absorbed (<i>N<i/><sub>H<sub/> > 10<sup>23<sup/> cm<sup>-2<sup/>), while one does not require intrinsic absorption; i.e., it appears to be a naked Seyfert 2 galaxy.