Accurate classification of 28 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue

Details Accurate classification of 28 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue Accurate classification of 28 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue

2011-12-21

arxiv.org/abs/1112.4992v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Poster at the conference "The Extreme and Variable High Energy Sky", September 19-23, 2011, Chia Laguna, Sardegna (Italy). 6 p

Scientific paper

Through an optical campaign performed at 4 telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we have obtained optical spectroscopy for 28 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 39 months Palermo Swift/BAT hard X-ray catalogue. We have been able to pinpoint the optical counterpart of these high energy sources by means of X-ray observations taken with Swift/XRT or XMM which allowed us to restrict the positional uncertainty from few arcmin to few arcsec; satellite data also provided information on the X-ray spectra of these objects. We find that 7 sources in our sample are Type 1 AGN while 20 are Type 2 AGN, with their redshifts lying between 0.009 and 0.075; the remaining object is a Galactic cataclysmic variable (CV). In this work we provide optical information for all 28 sources and the results of the soft X-ray analysis of 3 out of 5 AGN observed with XMM/Newton.

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