The Palermo Swift-BAT Hard X-ray Catalogue. II- Results after 39 months of sky survey

G. Cusumano; V. La Parola; A. Segreto; V. Mangano; C. Ferrigno; A. Maselli; P. Romano; T. Mineo; B. Sbarufatti; S. Campana; G. Chincarini; P. Giommi; N. Masetti; A. Moretti; G. Tagliaferri

doi:10.1051/0004-6361/200811184

arXiv · 0906.4788

The Palermo Swift-BAT Hard X-ray Catalogue. II- Results after 39 months of sky survey

G. Cusumano·V. La Parola·A. Segreto·V. Mangano·C. Ferrigno·A. Maselli·P. Romano·T. Mineo·B. Sbarufatti·S. Campana·G. Chincarini·P. Giommi·N. Masetti·A. Moretti·G. Tagliaferri

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Abstract

We present the Palermo Swift-BAT hard X-ray catalogue obtained from the analysis of the the data relative to the first 39 months of the Swift mission. We have developed a dedicated software to perform data reduction, mosaicking and source detection on 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, cross-correlation with the SIMBAD databases. The survey covers 90% of the sky down to a flux limit of 2.5x10E-11 erg/cm2/s and 50% of the sky down to a flux limit of 1.8x10E-11 erg/cm2/s in the 14-150 keV band. We derived a catalogue of 754 identified sources, of which ~69% are extragalactic, ~27% are Galactic objects, ~4% are already known X-ray or gamma ray emitters whose nature has not been determined yet. The integrated flux of the extragalactic sample is ~1% of the Cosmic X-ray background in the 14-150 keV range.

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G. Cusumano, V. La Parola, A. Segreto, V. Mangano, C. Ferrigno, A. Maselli, P. Romano, T. Mineo, B. Sbarufatti, S. Campana, G. Chincarini, P. Giommi, N. Masetti, A. Moretti, G. Tagliaferri. 2009-06-25. The Palermo Swift-BAT Hard X-ray Catalogue. II- Results after 39 months of sky survey. https://doi.org/10.1051/0004-6361%2F200811184

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