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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.03658 |
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| _version_ | 1866913380038606848 |
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| author | Lei, Hai Zhang, Ying-Kang Jiang, Xiong Kiehlmann, Sebastian Readhead, Anthony C. S. Chen, Liang Liao, Neng-Hui An, Tao |
| author_facet | Lei, Hai Zhang, Ying-Kang Jiang, Xiong Kiehlmann, Sebastian Readhead, Anthony C. S. Chen, Liang Liao, Neng-Hui An, Tao |
| contents | High-redshift ($z >3$) $γ$-ray blazars are rare, but they are crucial for our understanding of jet evolution, $γ$-ray production and propagation, and the growth of supermassive black holes in the early universe. A new analysis of Fermi-LAT data reveals a significant (5$σ$), spectrally soft ($Γ\simeq$ 3.0) $γ$-ray source in a specific 4-month epoch, cospatial with PKS 0201+113 ($z$ = 3.64). Monitoring of PKS 0201+113 at 15 GHz by the Owens Valley Radio Observatory 40 m Telescope from 2008 to 2023 shows a prominent flare that dominates the radio light curve. The maximum of the radio flare coincides with the $γ$-ray flare, strongly suggesting an association ($\textrm{p-value}=0.023$) between the $γ$-ray and the radio sources. PKS 0201+113 is only the third $γ$-ray blazar to be identified with $z> 3.5$, and it is the first such object to be identified by the detection of quasi-simultaneous $γ$-ray and radio flares. The jet properties of this peculiar blazar have been investigated. A detailed study of a two-zone leptonic model is presented that fits the broadband spectral energy distribution. An alternative scenario is also briefly discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03658 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A $γ$-Ray Emitting Blazar at Redshift 3.64: Fermi-LAT and OVRO Observations of PKS 0201+113 Lei, Hai Zhang, Ying-Kang Jiang, Xiong Kiehlmann, Sebastian Readhead, Anthony C. S. Chen, Liang Liao, Neng-Hui An, Tao High Energy Astrophysical Phenomena High-redshift ($z >3$) $γ$-ray blazars are rare, but they are crucial for our understanding of jet evolution, $γ$-ray production and propagation, and the growth of supermassive black holes in the early universe. A new analysis of Fermi-LAT data reveals a significant (5$σ$), spectrally soft ($Γ\simeq$ 3.0) $γ$-ray source in a specific 4-month epoch, cospatial with PKS 0201+113 ($z$ = 3.64). Monitoring of PKS 0201+113 at 15 GHz by the Owens Valley Radio Observatory 40 m Telescope from 2008 to 2023 shows a prominent flare that dominates the radio light curve. The maximum of the radio flare coincides with the $γ$-ray flare, strongly suggesting an association ($\textrm{p-value}=0.023$) between the $γ$-ray and the radio sources. PKS 0201+113 is only the third $γ$-ray blazar to be identified with $z> 3.5$, and it is the first such object to be identified by the detection of quasi-simultaneous $γ$-ray and radio flares. The jet properties of this peculiar blazar have been investigated. A detailed study of a two-zone leptonic model is presented that fits the broadband spectral energy distribution. An alternative scenario is also briefly discussed. |
| title | A $γ$-Ray Emitting Blazar at Redshift 3.64: Fermi-LAT and OVRO Observations of PKS 0201+113 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.03658 |