Two new high-energy γ-ray blazar candidates
| Autor: | Enrico Bernieri, A. Maselli, Enrico Massaro, Riccardo Campana |
|---|---|
| Přispěvatelé: | ITA |
| Rok vydání: | 2016 |
| Předmět: |
Infrared
Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Minimum spanning tree 01 natural sciences Latitude 0103 physical sciences Blazar 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics media_common High Energy Astrophysical Phenomena (astro-ph.HE) Physics 010308 nuclear & particles physics Astronomy Spectral density White dwarf Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) Astrophysics - High Energy Astrophysical Phenomena Visible spectrum |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 465:2784-2789 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stw3007 |
| Popis: | We report the detection of two new gamma-ray sources in the Fermi-LAT sky (Pass 8) at energies higher than 20 GeV, and confirmed at lower energies, using a source detection tool based on the Minimum Spanning Tree algorithm. One of these sources, at a Galactic latitude of about -4{\deg}, is a new discovery, while the other was previously reported above 50 GeV in the 2FHL catalogue. We searched for archival multi-wavelength data of possible counterparts and found interesting candidates. Both objects are radio sources and their WISE infrared colours are typical of blazars. While for the former source no optical spectra are available, for the latter a puzzling optical spectrum corresponding to a white dwarf star is found in the 6dF database. We discuss the spectral energy distributions of both sources and possible interpretations. Comment: 7 pages, 6 figures. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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