New AGN classifications in the Swift/BAT All-Sky Hard X-ray Survey

Details New AGN classifications in the Swift/BAT All-Sky Hard X-ray Survey New AGN classifications in the Swift/BAT All-Sky Hard X-ray Survey

2011-05-03

arxiv.org/abs/1105.0527v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures, 1 table; Poster. Published in the proceedings of "The restless Gamma-ray Universe", September 27-30, 2010,

Scientific paper

Through an optical campaign performed at the San Pedro Martir (Mexico) Telescope and using the 6dF archive (http://www.aao.gov.au/local/www/6df, Jones et al. 2004), we determine or give a better classification for 8 newly discovered Active Galactic Nuclei (AGN) in the Swift/BAT 22-months All-sky Hard X-ray Survey (Baumgartner et al. 2008, Tueller et al. 2010). All these objects have observations taken with Swift/XRT or Chandra or XMM archival data which allowed us to pinpoint their optical counterpart thanks to the precise (better than a few arcsec) soft X-ray positions afforded by these observatories. This information enabled us to obtain optical spectra of all these counterparts, since only three spectra are available on-line, but not flux calibrated, allowing us to reveal their real nature (Baumgartner et al. 2008 give only a tentative classification based upon their X-ray properties). Here we present the spectra, along with the corresponding finding charts obtained from the DSS-II red survey, of these 8 sources. We found that our sample is composed of 7 Seyfert 2 and one Seyfert 1, with redshift between 0.009 and 0.068.

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