First Detection of $γ$-Ray Emission from the Compact Symmetric Object JVAS J1311+1658
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| Format: | Preprint |
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2026
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| _version_ | 1866910018807267328 |
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| author | Jiang, Xiong Li, Yang-Ji Lei, Hai Wei, Da-Ming |
| author_facet | Jiang, Xiong Li, Yang-Ji Lei, Hai Wei, Da-Ming |
| contents | We report the first detection of $γ$-ray emission from the young radio galaxy JVAS~J1311+1658, classified as a compact symmetric object (CSO). This detection is characterized by a recent GeV $γ$-ray flare identified in Fermi-LAT data during MJD~60032.6--60132.6, with a $γ$-ray source detected at a significance level of $\sim6.2σ$. The average 0.1--300~GeV flux is measured to be $(1.6 \pm 0.6)\times10^{-8}\,\mathrm{ph\,cm^{-2}\,s^{-1}}$, with a photon spectral index of $Γ= 2.15 \pm 0.185$. We find that a radiative model of the radio lobes significantly underestimates the observed $γ$-ray emission. The strong flux and short-term variability over $\sim$100 days suggest that the emission likely originates from newly launched sub-kiloparsec-scale jets at the core. This detection provides a unique window into the extreme environments and early-stage jet activity of young radio galaxies, offering insights into their initial evolution and the formation of relativistic jets in the earliest phases of galaxy growth. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_10572 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | First Detection of $γ$-Ray Emission from the Compact Symmetric Object JVAS J1311+1658 Jiang, Xiong Li, Yang-Ji Lei, Hai Wei, Da-Ming High Energy Astrophysical Phenomena We report the first detection of $γ$-ray emission from the young radio galaxy JVAS~J1311+1658, classified as a compact symmetric object (CSO). This detection is characterized by a recent GeV $γ$-ray flare identified in Fermi-LAT data during MJD~60032.6--60132.6, with a $γ$-ray source detected at a significance level of $\sim6.2σ$. The average 0.1--300~GeV flux is measured to be $(1.6 \pm 0.6)\times10^{-8}\,\mathrm{ph\,cm^{-2}\,s^{-1}}$, with a photon spectral index of $Γ= 2.15 \pm 0.185$. We find that a radiative model of the radio lobes significantly underestimates the observed $γ$-ray emission. The strong flux and short-term variability over $\sim$100 days suggest that the emission likely originates from newly launched sub-kiloparsec-scale jets at the core. This detection provides a unique window into the extreme environments and early-stage jet activity of young radio galaxies, offering insights into their initial evolution and the formation of relativistic jets in the earliest phases of galaxy growth. |
| title | First Detection of $γ$-Ray Emission from the Compact Symmetric Object JVAS J1311+1658 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2602.10572 |