Revisiting the TeV flare of PKS 2155-304 in 2006
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| Format: | Preprint |
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2023
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| author | Tan, Hong-Bin Liu, Ruo-Yu Böttcher, Markus |
| author_facet | Tan, Hong-Bin Liu, Ruo-Yu Böttcher, Markus |
| contents | Blazars, a subclass of active galactic nuclei (AGN), are known to be bright $γ$-ray sources, frequently exhibiting active (flaring) periods. The blazar PKS~2155-304 is a high synchrotron-peaked BL Lac object located at redshift $z=0.116$. On 2006 July 28, an extremely remarkable outburst of VHE $γ$-ray emission from this blazar was reported by the H.E.S.S. experiment, with an average flux more than 10 times the low-state level. The variability timescale of this extraordinary flare was as short as approximately 200~s. In order to guarantee the transparency of the emission region for TeV photons, the fast variability demands an extremely high Doppler factor $δ_{\rm D}>50$ of the jet within the classical one-zone model, leading to the so-called "Doppler factor crisis". Here we demonstrate that the stochastic dissipation model, which is a multi-blob scenario for blazars, can self-consistently explain the giant TeV flares of PKS~2155-304 and the low-state emission before and after the flares, in terms of both multi-wavelength spectral and variability characteristics. The required Doppler factor in this model can be as low as 20, which is a reasonable and typical value for blazar jets. The obtained model parameters may shed some light on the physical properties of the relativistic jet. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_13873 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Revisiting the TeV flare of PKS 2155-304 in 2006 Tan, Hong-Bin Liu, Ruo-Yu Böttcher, Markus High Energy Astrophysical Phenomena Blazars, a subclass of active galactic nuclei (AGN), are known to be bright $γ$-ray sources, frequently exhibiting active (flaring) periods. The blazar PKS~2155-304 is a high synchrotron-peaked BL Lac object located at redshift $z=0.116$. On 2006 July 28, an extremely remarkable outburst of VHE $γ$-ray emission from this blazar was reported by the H.E.S.S. experiment, with an average flux more than 10 times the low-state level. The variability timescale of this extraordinary flare was as short as approximately 200~s. In order to guarantee the transparency of the emission region for TeV photons, the fast variability demands an extremely high Doppler factor $δ_{\rm D}>50$ of the jet within the classical one-zone model, leading to the so-called "Doppler factor crisis". Here we demonstrate that the stochastic dissipation model, which is a multi-blob scenario for blazars, can self-consistently explain the giant TeV flares of PKS~2155-304 and the low-state emission before and after the flares, in terms of both multi-wavelength spectral and variability characteristics. The required Doppler factor in this model can be as low as 20, which is a reasonable and typical value for blazar jets. The obtained model parameters may shed some light on the physical properties of the relativistic jet. |
| title | Revisiting the TeV flare of PKS 2155-304 in 2006 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.13873 |