Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...520a..47m&link_type=abstract
Astronomy and Astrophysics, Volume 520, id.A47
Astronomy and Astrophysics
Astrophysics
2
Galaxies: Active, Bl Lacertae Objects: General, Radiation Mechanisms: Non-Thermal
Scientific paper
Aims: We present the results from a study of the blazar content in the 15-150 keV map of the entire sky obtained analysing 39 months of data collected by the BAT telescope aboard the Swift satellite. Methods: We performed a cross-correlation of the significance map, obtained with a dedicated highly efficient algorithm for data processing and image reconstruction of the BAT survey data, with the blazar population of the Roma-BZCAT. After corrections for source confusion and spurious detections, we found significance excesses higher than two standard deviations for 304 sources, and the corresponding fraction of expected spurious associations is ~20%. We selected hard X-ray blazars according to their significance level and carried out a statistical analysis to characterise their emission properties. Results: A sample of 121 blazars detected at a significance level σ > 3 is discussed in greater detail. The fraction of blazars with uncertain classification in this sample is considerable (~23%), more than twice the percentage obtained considering all the blazars classified in the Roma-BZCAT (~9%). We attribute the X-ray flux of the majority of selected BL Lac objects to the synchrotron emission.
Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/520/A47
Cusumano Giancarlo
La Parola Valentina
Maselli Alessandro
Massaro Enrico
Sbarufatti Boris
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