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

Abstract

We present the results of a photon cluster search in the 7-years Fermi-Large Area Telescope extragalactic Pass 8 gamma-ray sky by means of the Minimum Spanning Tree (MST) algorithm, at energies higher than 10 GeV. We found 16 clusters of photons, corresponding to candidate gamma-ray sources, located very close to infrared-selected sources in the 1WHSP (WISE High Synchrotron Peaked) sample, and therein classified as either "new" or "candidate" blazars. In this paper some properties of the MST clusters and of the associated sources are presented.

arXiv comment8 pages, 1 figure. Accepted for publication in Astrophysics & Space Science

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• Optical spectroscopic observations of gamma-ray blazar candidates. X. Results from the 2018--2019 SOAR and OAN-SPM observations of blazar candidates of uncertain type
• A MST catalogue of gamma-ray source candidates above 10 GeV and at Galactic latitudes higher than 20 degrees
• Application of the MST clustering to the high energy gamma-ray sky. III - New detections of gamma-ray emission from blazars
• Minimum Spanning Tree cluster analysis of the LMC region above 10 GeV: detection of the SNRs N 49B and N 63A
• Two new high energy gamma-ray blazar candidates
• Application of the MST clustering to the high energy gamma-ray sky. IV - Blazar candidates found as possible counterparts of photon clusters
• Twelve-year update of the MST catalogue of gamma-ray source candidates above 10 GeV and at Galactic latitudes higher than 20 degrees
• High energy gamma-ray detection of supernova remnants in the Large Magellanic Cloud
• Search for $\gamma$-ray emission from SNRs in the Large Magellanic Cloud: a new cluster analysis at energies above 4 GeV
• New blazar candidates from the 9Y-MST catalogue detected at energies higher than 10 GeV