Identifying potentially missed extended sources in the Fermi-LAT 4FGL Catalog using clustering analysis

arXiv:2607.12776 · astro-ph.HE · Submitted 2026-07-14 · Read on arXiv

astro-ph.HE

Submitted: 2026-07-14

Updated: 2026-09-21

Comments: Accepted for publication in Astronomy & Astrophysics (A&A)

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

Terminology

• Clustering — 34× in this paper · explained in 2 episodes
• Core — 10× in this paper · explained in 2 episodes
• Trace — 5× in this paper · explained in 2 episodes
• HESS Galactic Plane Survey — 3× in this paper
• Calibration — 2× in this paper · explained in 7 episodes
• Density-Based Spatial Clustering of Applications with Noise — 2× in this paper
• Fermi Large Area Telescope — 2× in this paper
• AGN — 1× in this paper · explained in 1 episode
• Active Galactic Nuclei (AGN) — 1× in this paper · explained in 1 episode
• Akaike Information Criterion — 1× in this paper
• Alignment — 1× in this paper · explained in 1 episode
• Interpretability — 1× in this paper · explained in 15 episodes
• Robustness — 1× in this paper · explained in 5 episodes

Sources

• Search for Extended GeV Sources in the Inner Galactic Plane
• Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
• Fermi-LAT improved Pass~8 event selection

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