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

Abstract

We present the results of a photon cluster search in the γ -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 γ -ray emitters. The properties of these sources are discussed.

Application of the MST clustering to the high energy γ $\gamma$ -ray sky. II—Possible detection of γ $\gamma$ -ray emission from blazar candidates in the 1WHSP sample

“…In a companion paper (Campana et al 2016) we will instead focus on the analysis of clusters matching sources already classified as blazars and reported in the Roma BZCAT catalogue, extending the results of Paper I.…”

Exploring the extreme Universe with the Fermi Large Area Telescope

“…Our spectroscopic identifications were used by other groups to (i) build the luminosity function of BL Lacs (Ajello et al, 2013); (ii) select potential targets for the Cherenkov Telescope Array (CTA; Arsioli et al, 2015); (iii) obtain stringent limits on the dark matter annihilation in sub-halos (e.g., Berlin et al, 2014); (iv) search for counterparts of new flaring γ-ray sources (Bernieri et al, 2013); (v) test new γ-ray detection algorithms (Campana et al, 2016); (vi) perform population studies on the UGSs (e.g., Acero et al, 2013) and (vii) discover the new subclass of radio weak BL Lacs (e.g., Massaro et al, 2017). All the above studies confirm the legacy value of our results thus motivating the prosecution of our BCU follow up campaign.…”