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

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 ∼69% are extragalactic, ∼27% are Galactic objects, and ∼4% are already known X-ray or gamma ray emitters, whose nature has yet to be determined. The integrated flux of the extragalactic sample is ∼1% of the cosmic X-ray background in the 14-150 keV range.

Original languageEnglish (US)
Article numberA48
JournalAstronomy and Astrophysics
Volume510
Issue number1
DOIs
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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