Accurate classification of 28 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue
P. Parisi, N. Masetti, E. Jim\'enez-Bail\'on, V. Chavushyan, R. Landi,, A. Malizia, E. Palazzi, L. Bassani, A. Bazzano, A. J. Bird, G. Galaz, D., Minniti, L. Morelli, M. Schiavone, P. Ubertini

TL;DR
This study accurately classifies 28 hard X-ray sources from the Palermo Swift/BAT catalogue using optical spectroscopy and X-ray data, identifying their types and redshifts to improve source understanding.
Contribution
It provides the first optical classification and detailed analysis of 28 previously unclassified or poorly studied hard X-ray sources from the Palermo catalogue.
Findings
7 sources are Type 1 AGN
20 sources are Type 2 AGN
1 source is a Galactic cataclysmic variable
Abstract
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…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Astronomical Observations and Instrumentation · Gamma-ray bursts and supernovae
