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Application of the MST clustering to the high energy \(\gamma\)-ray sky. III—New detections of \(\gamma\)-ray emission from blazars

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Abstract

We present the results of a photon cluster search in the \(\gamma\)-ray sky observed by the Fermi Large Area Telescope, using the new Pass 8 dataset, at energies higher than 10 GeV. By means of the Minimum Spanning Tree (MST) algorithm, we found 25 clusters associated with catalogued blazars not previously known as \(\gamma\)-ray emitters. The properties of these sources are discussed.

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Notes

  1. http://www.slac.stanford.edu/exp/glast/groups/canda/lat_Performance.htm.

  2. http://fermi.gsfc.nasa.gov/ssc/data/access/.

  3. In that paper a more loose selection threshold was used, \(M>15\). See also Sect. 6 for a discussion.

  4. The Denoised, Deconvolved, and Decomposed Fermi \(\gamma\)-ray Sky, http://www.mpa-garching.mpg.de/ift/fermi/. Note that this catalogue uses data starting from 600 MeV, where the PSF and the source localisation is worse.

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Acknowledgements

We acknowledge use of archival Fermi data. We made large use of the online version of the Roma-BZCAT and of the scientific tools developed at the ASI Science Data Center (ASDC), of the Sloan Digital Sky Survey (SDSS) archive, of the NED database and other astronomical catalogues distributed in digital form (Vizier and Simbad) at Centre de Dates astronomiques de Strasbourg (CDS) at the Louis Pasteur University.

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Correspondence to R. Campana.

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Campana, R., Massaro, E. & Bernieri, E. Application of the MST clustering to the high energy \(\gamma\)-ray sky. III—New detections of \(\gamma\)-ray emission from blazars. Astrophys Space Sci 361, 185 (2016). https://doi.org/10.1007/s10509-016-2768-2

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