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A GeV Gamma-Ray Spectral Excess in the Fermi Blazar 4FGL J0136.5+3906
Abstract
We report the detection of a ∼{19} GeV gamma-ray spectral excess (peak energy in observer frame) at ∼5.7σ significance (3 degrees of freedom, without correction for trials and the look-elsewhere effect) in the Fermi-LAT data of the blazar 4FGL J0136.5+3906, based on ∼{17} years of observations. The excess manifests as a distinct bump-like feature in the 100 MeV−1 TeV spectrum, with a flux of ∼3.6×10−10 ph cm−2 s−1. No similar feature is detected in nearby sources or background regions. The origin of this signal cannot be explained by standard blazar emission models and remains unknown. This Letter presents the observational finding without providing a definitive physical interpretation.
Versions
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BibTeX
@misc{kang2026gammaray,
title = {{A GeV Gamma-Ray Spectral Excess in the Fermi Blazar 4FGL J0136.5+3906}},
author = {Shi-Ju Kang and Yue Yin and Yong-Gang Zheng and Qingwen Wu and Junhui Fan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.14924},
eprint = {2610.14924},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.14924},
}
RIS
TY - UNPB
TI - A GeV Gamma-Ray Spectral Excess in the Fermi Blazar 4FGL J0136.5+3906
AU - Shi-Ju Kang
AU - Yue Yin
AU - Yong-Gang Zheng
AU - Qingwen Wu
AU - Junhui Fan
PY - 2026
DA - 2026/10/10
PB - arXiv
DO - 10.48550/arxiv.2610.14924
UR - https://arxiv.org/abs/2610.14924
AB - We report the detection of a ∼{19} GeV gamma-ray spectral excess (peak energy in observer frame) at ∼5.7σ significance (3 degrees of freedom, without correction for trials and the look-elsewhere effect) in the Fermi-LAT data of the blazar 4FGL J0136.5+3906, based on ∼{17} years of observations. The excess manifests as a distinct bump-like feature in the 100 MeV−1 TeV spectrum, with a flux of ∼3.6×10^−10 ph cm^−2 s^−1. No similar feature is detected in nearby sources or background regions. The origin of this signal cannot be explained by standard blazar emission models and remains unknown. This Letter presents the observational finding without providing a definitive physical interpretation.
ER -