The Palermo Swift-BAT hard X-ray catalogue*
II. Results after 39 months of sky survey
INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo,
via U. La Malfa 153, 90146 Palermo, Italy e-mail: email@example.com
2 Institut für Astronomie und Astrophysik Tübingen (IAAT), Germany
3 ISDC Data Centre for Astrophysics, Chemin d'Écogia 16, 1290 Versoix, Switzerland
4 INAF – Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy
5 Università degli studi di Milano-Bicocca, Dipartimento di Fisica, Piazza delle Scienze 3, 20126 Milan, Italy
6 ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy
7 INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, 40129 Bologna, Italy
Accepted: 23 June 2009
Aims. We present the Palermo Swift-BAT hard X-ray catalogue obtained from the analysis of data acquired during the first 39 months of the Swift mission.
Methods. We developed a dedicated software to perform the data reduction, mosaicking, and source detection of the BAT survey data. We analyzed the BAT dataset in three energy bands (14-150 keV, 14-30 keV, 14-70 keV), obtaining a list of 962 detections above a significance threshold of 4.8 standard deviations. The identification of the source counterparts was pursued using three strategies: cross-correlation with published hard X-ray catalogues, analysis of field observations of soft X-ray instruments, and cross-correlation with SIMBAD databases.
Results. The survey covers 90% of the sky down to a flux limit of 2.5 10-11 erg cm-2 s-1 and 50% of the sky down to a flux limit of 1.8 10-11 erg cm-2 s-1 in the 14-150 keV band. We derived a catalogue of 754 identified sources, of which % are extragalactic, % are Galactic objects, and % are already known X-ray or gamma ray emitters, whose nature has yet to be determined. The integrated flux of the extragalactic sample is of the cosmic X-ray background in the 14-150 keV range.
Key words: X-rays: general / catalogs / surveys
Table [see full text] is also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/510/A48
© ESO, 2010