Hunting for extreme high-energy-peaked BL Lacs: Rare to find and difficult to classify

arXiv:2606.26475 · astro-ph.HE · Submitted 2026-06-25 · Read on arXiv

Loredana Bassani, Raffaella Landi, Nicola Masetti

astro-ph.HE

Submitted: 2026-06-25

Comments: 14 pages, 9 figures, 2 tables; accepted for publication in Journal of High Energy Astrophysics

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• AGN — 45× in this paper · explained in 1 episode
• Very Large Array — 4× in this paper
• Core — 2× in this paper · explained in 2 episodes
• Rapid ASKAP Continuum Survey — 2× in this paper
• Wide-field Infrared Survey Explorer — 2× in this paper
• Burst Alert Telescope — 1× in this paper
• Calibration — 1× in this paper · explained in 7 episodes
• Jansky Very Large Array Sky Survey — 1× in this paper
• Photon Counting — 1× in this paper

Sources

• Incremental Fermi Large Area Telescope Fourth Source Catalog
• Disentangling Cataclysmic Variables in Gaia's HR-Diagram
• Unravelling the complex behavior of Mrk 421 with simultaneous X-ray and VHE observations during an extreme flaring activity in April 2013
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• Progress in unveiling extreme particle acceleration in persistent astrophysical jets
• A Multi-Epoch VLBI Survey of the Kinematics of CJF Sources; Part I: Model-Fit Parameters and Maps
• The Swift X-ray Telescope
• BASS XXXV. The $M_\rm{BH}$-$\sigma_\rm{\star}$ Relation of 105-Month Swift-BAT Type 1 AGNs
• Photometric classification of emission line galaxies with Machine Learning methods
• A Uniformly Selected, Southern-Sky 6dF, Optical AGN Catalog
• Radio Sources in the Nearby Universe
• Extreme synchrotron BL Lac objects
• Giant radio galaxies in the LOFAR Two-metre Sky Survey-I
• Two new catalogs of blazar candidates in the WISE infrared sky
• The Early Data Release of the Dark Energy Spectroscopic Instrument
• The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
• The Rapid ASKAP Continuum Survey (RACS) VI: The RACS-high 1655.5 MHz images and catalogue
• The Rapid ASKAP Continuum Survey V: cataloguing the sky at 1367.5 MHz and the second data release of RACS-mid
• All-purpose, all-sky photometric redshifts for the Legacy Imaging Surveys Data Release 8

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