Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714
In this work, we analyzed multiwavelength data of the BL Lac object S5 0716+714 to investigate its emission mechanisms during a flaring state observed in early 2015. We examined the temporal behavior and broadband spectral energy distributions (SEDs) during the flare. The size of the γ -ray emission...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ada3bc |
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| author | Zhihao Ouyang Hubing Xiao Marina Manganaro Shangchun Xie Jingyu Wu Jianzhen Chen Rui Xue Gege Wang Shaohua Zhang Junhui Fan |
| author_facet | Zhihao Ouyang Hubing Xiao Marina Manganaro Shangchun Xie Jingyu Wu Jianzhen Chen Rui Xue Gege Wang Shaohua Zhang Junhui Fan |
| author_sort | Zhihao Ouyang |
| collection | DOAJ |
| description | In this work, we analyzed multiwavelength data of the BL Lac object S5 0716+714 to investigate its emission mechanisms during a flaring state observed in early 2015. We examined the temporal behavior and broadband spectral energy distributions (SEDs) during the flare. The size of the γ -ray emission region was estimated based on the variability timescale. To explore the multiwavelength properties of S5 0716+714, we employed three one-zone models: the synchrotron self-Compton (SSC) model, the SSC plus external Compton (EC) model, and the SSC plus pp interactions model, to reproduce the SEDs. Our findings indicate that, while the SSC model can describe the SEDs, it requires an extreme Doppler factor. In contrast, the SSC plus EC model successfully fits the SEDs under the assumption of weak external photon fields but requires a high Doppler factor. Additionally, the SSC plus pp interactions model also reproduces the SEDs, with γ -ray emission originating from π ^0 decay. However, this model leads to a jet power that exceeds the Eddington luminosity, which remains plausible due to the flaring state or the presence of a highly collimated jet. |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-f844b08224d14dbbbfda0afb583c57302025-01-31T13:27:40ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198011910.3847/1538-4357/ada3bcRevisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714Zhihao Ouyang0https://orcid.org/0009-0000-4102-9115Hubing Xiao1https://orcid.org/0000-0001-8244-1229Marina Manganaro2https://orcid.org/0000-0003-1530-3031Shangchun Xie3Jingyu Wu4Jianzhen Chen5Rui Xue6https://orcid.org/0000-0003-1721-151XGege Wang7https://orcid.org/0000-0002-8032-4640Shaohua Zhang8https://orcid.org/0000-0001-8485-2814Junhui Fan9https://orcid.org/0000-0002-5929-0968Shanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cn; Center for Astrophysics, Guangzhou University , Guangzhou, 510006, People’s Republic of ChinaShanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cnDepartment of Physics, University of Rijeka , Rijeka, 51000, Croatia ; marina.manganaro@phy.uniri.hrShanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cnShanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cnShanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cnDepartment of Physics, Zhejiang Normal University , Jinhua, 321004, People’s Republic of ChinaKey Laboratory of Cosmology and Astrophysics (Liaoning) & College of Sciences, Northeastern University , Shenyang, 110819, People’s Republic of ChinaShanghai Key Lab for Astrophysics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China ; hubing.xiao@shnu.edu.cn, jzchen@shnu.edu.cnCenter for Astrophysics, Guangzhou University , Guangzhou, 510006, People’s Republic of China; Great Bay Brand Center of the National Astronomical Data Center , Guangzhou, 510006, People’s Republic of China; Key Laboratory for Astronomical Observation and Technology of Guangzhou , Guangzhou, 510006, People’s Republic of China; Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province , Guangzhou, 510006, People’s Republic of ChinaIn this work, we analyzed multiwavelength data of the BL Lac object S5 0716+714 to investigate its emission mechanisms during a flaring state observed in early 2015. We examined the temporal behavior and broadband spectral energy distributions (SEDs) during the flare. The size of the γ -ray emission region was estimated based on the variability timescale. To explore the multiwavelength properties of S5 0716+714, we employed three one-zone models: the synchrotron self-Compton (SSC) model, the SSC plus external Compton (EC) model, and the SSC plus pp interactions model, to reproduce the SEDs. Our findings indicate that, while the SSC model can describe the SEDs, it requires an extreme Doppler factor. In contrast, the SSC plus EC model successfully fits the SEDs under the assumption of weak external photon fields but requires a high Doppler factor. Additionally, the SSC plus pp interactions model also reproduces the SEDs, with γ -ray emission originating from π ^0 decay. However, this model leads to a jet power that exceeds the Eddington luminosity, which remains plausible due to the flaring state or the presence of a highly collimated jet.https://doi.org/10.3847/1538-4357/ada3bcBL Lacertae objectsBlazarsActive galactic nuclei |
| spellingShingle | Zhihao Ouyang Hubing Xiao Marina Manganaro Shangchun Xie Jingyu Wu Jianzhen Chen Rui Xue Gege Wang Shaohua Zhang Junhui Fan Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 The Astrophysical Journal BL Lacertae objects Blazars Active galactic nuclei |
| title | Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 |
| title_full | Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 |
| title_fullStr | Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 |
| title_full_unstemmed | Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 |
| title_short | Revisiting the Flaring Activity in Early 2015 of BL Lacertae Object S5 0716+714 |
| title_sort | revisiting the flaring activity in early 2015 of bl lacertae object s5 0716 714 |
| topic | BL Lacertae objects Blazars Active galactic nuclei |
| url | https://doi.org/10.3847/1538-4357/ada3bc |
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