Detection of an Orphan X-ray Flare from a Blazar Candidate EP240709a with Einstein Probe

Detection of an Orphan X-ray Flare from a Blazar Candidate EP240709a with Einstein Probe

Blazars are often observed to flare across multiple wavelengths. Orphan flares from blazars have been only detected a few times, providing an opportunity to understand the structure of the jet in the accreting system. We report a remarkable orphan X-ray flare from a blazar candidate EP240709a, detec...

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Veröffentlicht in:arXiv.org 2024-12
Hauptverfasser: Liu, Mingjun, Zhang, Yijia, Wang, Yun, Xue, Rui, Buckley, David, Howell, D Andrew, Jin, Chichuan, Li, Wenxiong, Monageng, Itumeleng, Pan, Haiwu, Ning-Chen, Sun, Tinyanont, Samaporn, Wang, Lingzhi, Yuan, Weimin, An, Jie, Andrews, Moira, Anutarawiramkul, Rungrit, Butpan, Pathompong, Cheng, Huaqing, Cui-Yuan, Dai, Dai, Lixin, Farah, Joseph, Feng, Hua, Fu, Shaoyu, Guo, Zhen, Jiang, Shuaiqing, Li, An, Li, Dongyue, Liang, Yifang, Liu, Heyang, Liu, Xing, Liu, Yuan, Mao, Jirong, McCully, Curtis, Newsome, Megan, Estefania Padilla Gonzalez, Pan, Xin, Sun, Xinxiang, Terreran, Giacomo, Wang, Ze-Rui, Wu, Qinyu, Hubing Xiao, Xiong, Dingrong, Xu, Dong, Xu, Xinpeng, Xue, Suijian, Yang, Haonan, Yang, Jun, Zhang, Jin, Zhang, Wenda, Zhang, Wenjie, Zou, Hu
Format: Artikel
Sprache:eng
Schlagworte:
Blazars
Infrared spectra
Sky surveys (astronomy)
Spectral energy distribution
X-ray astronomy
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Zusammenfassung:Blazars are often observed to flare across multiple wavelengths. Orphan flares from blazars have been only detected a few times, providing an opportunity to understand the structure of the jet in the accreting system. We report a remarkable orphan X-ray flare from a blazar candidate EP240709a, detected by Einstein Probe (EP) in July 2024. The multi-band spectral properties and variability support EP240709a as a high-energy peaked BL Lacertae-type object. The flux in 0.5-10 keV increases by at least 28 times to the value of low state in 2020, with non-detection of remarkable flaring in other bands during the same period. EP240709a exhibits the harder-when-brighter tendency in the X-ray band during the orphan flare, while its infrared-optical spectra are featureless. We employ one-zone and two-zone leptonic synchrotron self-Compton models to perform the spectral energy distribution fitting. Detecting this rare orphan flare shows the potential of EP in discovering peculiar activities from AGN in high-cadence X-ray sky surveys.
ISSN:2331-8422