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Application of the MST clustering to the high energy \(\gamma\)-ray sky. I—New possible detection of high-energy \(\gamma\)-ray emission associated with BL Lac objects

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Abstract

In this paper we show an application of the Minimum Spanning Tree (MST) clustering method to the high-energy \(\gamma\)-ray sky observed at energies higher than 10 GeV in 6.3 years by the Fermi-Large Area Telescope. We report the detection of 19 new high-energy \(\gamma\)-ray clusters with good selection parameters whose centroid coordinates were found matching the positions of known BL Lac objects in the 5th Edition of the Roma-BZCAT catalogue. A brief summary of the properties of these sources is presented.

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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. The fact that some sources are faint in the radio is typical of HBL objects. The 3LAC catalogue, for instance, includes 48 sources with a radio flux at 1.4 GHz lower than 10 mJy (about all of HSP type). Considering the fact that we are searching for faint gamma-ray sources (the bright ones are already in the 3FGL catalogue!) it reasonable to assume they could be also faint in the radio band.

  4. http://www.cv.nrao.edu/nvss/.

  5. http://sundog.stsci.edu/first/catalogs/readme.html.

  6. The Denoised, Deconvolved, and Decomposed Fermi \(\gamma\)-ray Sky, http://www.mpa-garching.mpg.de/ift/fermi/.

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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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Authors and Affiliations

  1. INAF–IASF-Bologna, via Piero Gobetti 101, 40129, Bologna, Italy

    R. Campana

  2. INAF–IAPS, via del Fosso del Cavaliere 100, 00133, Roma, Italy

    E. Massaro

  3. In Unam Sapientiam, Roma, Italy

    E. Massaro

  4. INFN–Sezione di Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy

    E. Bernieri

  5. Dipartimento di Matematica e Fisica, Università di Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy

    Q. D’Amato

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  1. R. Campana
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  2. E. Massaro
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  3. E. Bernieri
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  4. Q. D’Amato
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Correspondence to R. Campana.

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Campana, R., Massaro, E., Bernieri, E. et al. Application of the MST clustering to the high energy \(\gamma\)-ray sky. I—New possible detection of high-energy \(\gamma\)-ray emission associated with BL Lac objects. Astrophys Space Sci 360, 65 (2015). https://doi.org/10.1007/s10509-015-2570-6

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  • DOI: https://doi.org/10.1007/s10509-015-2570-6

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