Hunting extreme BL Lacertae blazars with Fermi-LAT

Abstract

The emission of very-high-energy photons (VHE, E>100 GeV$) in blazars is closely connected to the production of ultra-relativistic particles and the role of these gamma-ray sources as cosmic particle accelerators. This work focuses on a selection of 22 gamma-ray objects from the 2BIGB catalog of high-synchrotron-peaked sources, which are classified as blazar candidates of uncertain type in the 4FGL-DR2 catalog. We study these sources by means of a re-analysis of the first 10 years of gamma-ray data taken with the Fermi Large Area Telescope, including the attenuation by the extragalactic background light. Their broadband spectral energy distributions are also evaluated, using multi-wavelength archival data in the radio, optical, and X-ray bands, in terms of one-zone synchrotron-self-Compton models, adding an external Compton component when needed. Out of this analysis, we identify 17 new extreme high-synchrotron-peaked (EHSP) candidates and compare their physical parameters with those of prototypical EHSP blazars. Finally, the resulting models are used to assess their detectability by the present and future generation of ground-based imaging atmospheric Cherenkov telescopes. We find two VHE candidates within the reach of the current and next generation of Cherenkov telescopes: J0847.0-2336 and J1714.0-2029.

25 pages, 7 figures, accepted for publication in MNRAS

References in corpus (26)

• Second ROSAT all-sky survey (2RXS) source catalogue
• Magnetic acceleration of relativistic AGN jets
• The first XMM-Newton slew survey catalogue: XMMSL1
• Evidence for a new light spin-zero boson from cosmological gamma-ray propagation?
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• Black hole lightning due to particle acceleration at subhorizon scales
• Hints of the existence of Axion-Like-Particles from the gamma-ray spectra of cosmological sources
• Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
• An observational determination of the evolving extragalactic background light from the multiwavelength HST/CANDELS survey in the Fermi and CTA era
• The Central Engines of Fermi Blazars
• The Blazar Sequence: Validity and Predictions
• GammaLib and ctools: A software framework for the analysis of astronomical gamma-ray data
• General Physical Properties of CGRaBS Blazars
• Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
• Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets
• The 2014 TeV Gamma-ray Flare of Mrk 501 Seen with H.E.S.S.: Temporal and Spectral Constraints on Lorentz Invariance Violation
• 1WHSP: an IR-based sample of $\sim$1,000 VHE $\gamma$-ray blazar candidates
• An emerging population of BL Lacs with extreme properties: towards a class of EBL and cosmic magnetic field probes?
• Particle Acceleration in Mildly Relativistic Shearing Flows: the Interplay of Systematic and Stochastic Effects, and the Origin of the Extended High-energy Emission in AGN Jets
• The Relativistic Jet Dichotomy and the End of the Blazar Sequence
• Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei
• Optical spectroscopy of Blazars for the Cherenkov Telescope Array
• Systematic Physical Characterization of the Gamma-Ray Spectra of 2FHL Blazars
• Searching for $\gamma$-ray signature in WHSP blazars: Fermi-LAT detection of 150 excess signal in the 0.3-500 GeV band
• Extreme & High Synchrotron Peak Blazars beyond 4FGL: The 2BIGB $\gamma$-ray catalogue
• Searching for TeV Candidates in 4LAC High-synchrotron-peaked Frequency BL Lac Objects

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• Long-term multi-wavelength study of 1ES 0647+250
• Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: First Results
• Exploring TeV candidates of Fermi blazars through machine learning
• Exploring the Most Extreme Gamma-Ray Blazars Using Broadband Spectral Energy Distributions
• Identifying the 3FHL catalog: VI. Results of the 2019 Gemini optical spectroscopy campaign
• The relation between optical and $\gamma$-ray emission in BL Lac sources
• Coexistence of Chromatic Flares and an Achromatic QPO in the Gamma-ray Blazar PG 1553+113
• A Systematic Search for Spectral Hardening in Blazar Flares with the Fermi-Large Area Telescope
• A Unified Multi-Wavelength Data Analysis Workflow with gammapy. Constraining the Broadband Emission of FSRQ OP 313
• Properties and Possible Physical Origins of $\gamma$-ray Emission in Extreme Synchrotron Blazars
• Extreme Blazars Observed with MAGIC: Second Catalog Release
• Detection of new very-high-energy sources outside the galactic plane in the Fermi-LAT data