H.E.S.S. Detects High-Redshift Blazar PKS 0346-27
Published:Dec 30, 2025 13:40
•1 min read
•ArXiv
Analysis
This paper is significant because it extends the redshift range of very-high-energy (VHE) gamma-ray detected blazars, providing insights into the cosmological evolution of blazars and the Extragalactic Background Light (EBL). The detection of PKS 0346-27 at z ~ 1 challenges the previous limitations and opens new avenues for understanding these distant objects. The multi-wavelength analysis, including data from H.E.S.S., Fermi-LAT, Swift, and ATOM, allows for detailed modeling of the blazar's emission, potentially revealing the underlying physical processes. The paper also explores different emission models (leptonic and hadronic) to explain the observed spectral energy distribution (SED).
Key Takeaways
- •First VHE gamma-ray detection of a blazar at z ~ 1.
- •Multi-wavelength observations used to model the blazar's emission.
- •Hadronic model favored, but leptonic model also considered.
- •Challenges existing limitations on VHE blazar detection.
Reference
“PKS~0346-27 has been detected by H.E.S.S at a significance of 6.3$σ$ during one night, on 3 November 2021...”