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

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arxiv 2412.18463 v1 pith:W6DYC6UR submitted 2024-12-24 astro-ph.HE

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

Mingjun Liu , Yijia Zhang , Yun Wang , Rui Xue , David Buckley , D. Andrew Howell , Chichuan Jin , Wenxiong Li
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Itumeleng Monageng Haiwu Pan Ning-Chen Sun Samaporn Tinyanont Lingzhi Wang Weimin Yuan Jie An Moira Andrews Rungrit Anutarawiramkul Pathompong Butpan Huaqing Cheng Cui-Yuan Dai Lixin Dai Joseph Farah Hua Feng Shaoyu Fu Zhen Guo Shuaiqing Jiang An Li Dongyue Li Yifang Liang Heyang Liu Xing Liu Yuan Liu Jirong Mao Curtis McCully Megan Newsome Estefania Padilla Gonzalez Xin Pan Xinxiang Sun Giacomo Terreran Ze-Rui Wang Qinyu Wu Hubing Xiao Dingrong Xiong Dong Xu Xinpeng Xu Suijian Xue Haonan Yang Jun Yang Jin Zhang Wenda Zhang Wenjie Zhang Hu Zou
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keywords flareorphanep240709ax-rayblazarblazarscandidatedetected
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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.

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