Correlation Study of TeV Blazars in Optical Band and γ-ray Band

Zhang Shun; Yi Tingfeng; Lu He; Chen Yutong; Wang Liang; Wang Na; Pu Zhiyuan; Dong Liang

doi:10.14005/j.cnki.issn1672-7673.20230913.001

Astronomical Research and Technology > 2023 > 20(6): 510-517. > DOI: 10.14005/j.cnki.issn1672-7673.20230913.001 CSTR: 32083.14.j.cnki.issn1672-7673.20230913.001

Zhang Shun, Yi Tingfeng, Lu He, Chen Yutong, Wang Liang, Wang Na, Pu Zhiyuan, Dong Liang. Correlation Study of TeV Blazars in Optical Band and γ-ray Band[J]. Astronomical Research and Technology, 2023, 20(6): 510-517. DOI: 10.14005/j.cnki.issn1672-7673.20230913.001

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Correlation Study of TeV Blazars in Optical Band and γ-ray Band

1. School of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China;
2. Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China;
3. Yunnan Province China-Malaysia HF-VHF Advanced Radio Astronomy Technology International Joint Laboratory, Kunming 650216, China

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Received Date: July 03, 2023
Revised Date: July 25, 2023
Available Online: November 20, 2023

Graphical Abstract

Abstract

Abstract

Multi band correlation analysis is of great significance to the study of the physical model and radiation mechanism of Blazars. In order to study the physical model of TeV Blazars, we search and sort out their γ-ray band data and optical band data according to the names and coordinates of their counterparts of 78 TeV Blazars in the 4FGL-DR3 catalogue, and find that there are 56 TeV Blazars with both optical band and γ-ray band data. The Discrete Correlation Function (DCF) is used to calculate the correlation between the optics and γ-ray of each Blazar. The calculation results show that 20 sources show weak γ-ray-optical correlation, 30 sources show strong γ-ray-optical correlation, and 6 sources show no γ-ray-optical correlation. Among sources that exhibit strong correlation, there is also varying degrees of time delay between the optical and γ-ray bands. These results support that the high-energy photons of TeV Blazar mainly come from synchronous self Compton radiation of lepton model. However, we also find that there are some “orphan flares” in both the optical and γ-ray bands, which may indicate that the source of low energy photons is not unique.
- TeV blazar,
- Discrete Correlation Function,
- Lepton Model

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References (14)

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