Accurate classification of 17 AGNs detected with Swift/BAT

P. Parisi, N. Masetti, E. Jiménez-Bailón, V. Chavushyan, A. Malizia, R. Landi, M. Molina, M. Fiocchi, E. Palazzi, L. Bassani, A. Bazzano, A. J. Bird, A. J. Dean, G. Galaz, E. Mason, D. Minniti, L. Morelli, J. B. Stephen, P. Ubertini

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

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 objects, we did not find any clear Compton thick AGN, but at least 6 out of 9 of them are highly absorbed (NH < 1023 cm-2), while one does not require intrinsic absorption; i.e., it appears to be a naked Seyfert 2 galaxy.

Original languageEnglish
Pages (from-to)1345-1358
Number of pages14
JournalAstronomy and Astrophysics
Volume507
Issue number3
DOIs
Publication statusPublished - 1 Dec 2009

Keywords

  • Galaxies: Seyfert
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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