A Tentative Double Excess in the Gamma-Ray Spectrum of the Fermi Blazar 4FGL J0604.9-0000

arXiv:2606.23488 · astro-ph.HE · Submitted 2026-06-22 · Read on arXiv

Shi-Ju Kang

astro-ph.HE

Submitted: 2026-06-22

Comments: 9 pages, 3 figures, 1 table, Comments are welcome!

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

Terminology

• AGN — 8× in this paper · explained in 1 episode
• Active Galactic Nuclei (AGN) — 1× in this paper · explained in 1 episode

Sources

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Relativistic Jets in Active Galactic Nuclei
• The Proton Blazar
• A Proton Synchrotron Blazar Model for Flaring in Markarian~501
• BL Lac Objects in the Synchrotron Proton Blazar Model
• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• Progress in Multiwavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges
• Relativistic Jets of Blazars
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Fermi Large Area Telescope Fourth Source Catalog
• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
• Fermi-LAT 16-year Source List
• Early Fermi Gamma-ray Space Telescope Observations of the Quasar 3C 454.3
• The complex gamma-ray behaviour of the Radio Galaxy M87
• Two-Component gamma-ray Emission Spectrum and X-Ray Polarization of the Radio Galaxy Pictor A
• The Detection of Teraelectronvolt Radiation from a Flat Spectrum Radio Quasar
• A Systematic Search for Spectral Hardening in Blazar Flares with the Fermi-Large Area Telescope
• A possible blazar spectral irregularity case caused by photon--axionlike-particle oscillations
• A Universal 1.5 GeV Gamma-Ray Line in Active Galactic Nuclei

Related papers

• Numerical Studies of Accretion Flows onto a Neutron Star Engulfed in a Massive Star
• Collisionless Accretion of Finite-Angular-Momentum Plasma onto a Spinning Black Hole
• Impact of Magnetic Field Topology on Electromagnetic and Gravitational Waves from Binary Neutron Star Merger Remnants
• XRISM Resolve Spectroscopy of GX 5-1: Constraints on Iron Spectral Features in a Luminous Neutron-Star Binary
• SN 1006: A Cosmic Laboratory for Investigating Shock Acceleration Physics
• Neutrino Spectral Pinching in 3D Core-Collapse Supernovae: Late-Time Convergence, Failed-Explosion Signatures, and Viewing-Angle Dispersion