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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| creator | 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 |
| description | 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. |
| format | Article |
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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.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Blazars ; Infrared spectra ; Sky surveys (astronomy) ; Spectral energy distribution ; X-ray astronomy</subject><ispartof>arXiv.org, 2024-12</ispartof><rights>2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>776,780</link.rule.ids></links><search><creatorcontrib>Liu, Mingjun</creatorcontrib><creatorcontrib>Zhang, Yijia</creatorcontrib><creatorcontrib>Wang, Yun</creatorcontrib><creatorcontrib>Xue, Rui</creatorcontrib><creatorcontrib>Buckley, David</creatorcontrib><creatorcontrib>Howell, D Andrew</creatorcontrib><creatorcontrib>Jin, Chichuan</creatorcontrib><creatorcontrib>Li, Wenxiong</creatorcontrib><creatorcontrib>Monageng, Itumeleng</creatorcontrib><creatorcontrib>Pan, Haiwu</creatorcontrib><creatorcontrib>Ning-Chen, Sun</creatorcontrib><creatorcontrib>Tinyanont, Samaporn</creatorcontrib><creatorcontrib>Wang, Lingzhi</creatorcontrib><creatorcontrib>Yuan, Weimin</creatorcontrib><creatorcontrib>An, Jie</creatorcontrib><creatorcontrib>Andrews, Moira</creatorcontrib><creatorcontrib>Anutarawiramkul, Rungrit</creatorcontrib><creatorcontrib>Butpan, Pathompong</creatorcontrib><creatorcontrib>Cheng, Huaqing</creatorcontrib><creatorcontrib>Cui-Yuan, Dai</creatorcontrib><creatorcontrib>Dai, Lixin</creatorcontrib><creatorcontrib>Farah, Joseph</creatorcontrib><creatorcontrib>Feng, Hua</creatorcontrib><creatorcontrib>Fu, Shaoyu</creatorcontrib><creatorcontrib>Guo, Zhen</creatorcontrib><creatorcontrib>Jiang, Shuaiqing</creatorcontrib><creatorcontrib>Li, An</creatorcontrib><creatorcontrib>Li, Dongyue</creatorcontrib><creatorcontrib>Liang, Yifang</creatorcontrib><creatorcontrib>Liu, Heyang</creatorcontrib><creatorcontrib>Liu, Xing</creatorcontrib><creatorcontrib>Liu, Yuan</creatorcontrib><creatorcontrib>Mao, Jirong</creatorcontrib><creatorcontrib>McCully, Curtis</creatorcontrib><creatorcontrib>Newsome, Megan</creatorcontrib><creatorcontrib>Estefania Padilla Gonzalez</creatorcontrib><creatorcontrib>Pan, Xin</creatorcontrib><creatorcontrib>Sun, Xinxiang</creatorcontrib><creatorcontrib>Terreran, Giacomo</creatorcontrib><creatorcontrib>Wang, Ze-Rui</creatorcontrib><creatorcontrib>Wu, Qinyu</creatorcontrib><creatorcontrib>Hubing Xiao</creatorcontrib><creatorcontrib>Xiong, Dingrong</creatorcontrib><creatorcontrib>Xu, Dong</creatorcontrib><creatorcontrib>Xu, Xinpeng</creatorcontrib><creatorcontrib>Xue, Suijian</creatorcontrib><creatorcontrib>Yang, Haonan</creatorcontrib><creatorcontrib>Yang, Jun</creatorcontrib><creatorcontrib>Zhang, Jin</creatorcontrib><creatorcontrib>Zhang, Wenda</creatorcontrib><creatorcontrib>Zhang, Wenjie</creatorcontrib><creatorcontrib>Zou, Hu</creatorcontrib><title>Detection of an Orphan X-ray Flare from a Blazar Candidate EP240709a with Einstein Probe</title><title>arXiv.org</title><description>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.</description><subject>Blazars</subject><subject>Infrared spectra</subject><subject>Sky surveys (astronomy)</subject><subject>Spectral energy distribution</subject><subject>X-ray astronomy</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqNyr0OgjAUQOHGxESivMNNnElKy-8qQtxkcHAjVymhBFtsS4w-vQw-gNM3nLMiHuM8DLKIsQ3xrR0opSxJWRxzj1yPwom7k1qB7gAVnM3UL1wDg2-oRjQCOqMfgHAY8YMGClStbNEJKGsW0ZTmCC_peiilsk5IBbXRN7Ej6w5HK_yfW7KvyktxCiajn7Owrhn0bNSSGh5GeUiTjMX8v-sLO4U_Pg</recordid><startdate>20241224</startdate><enddate>20241224</enddate><creator>Liu, Mingjun</creator><creator>Zhang, Yijia</creator><creator>Wang, Yun</creator><creator>Xue, Rui</creator><creator>Buckley, David</creator><creator>Howell, D Andrew</creator><creator>Jin, 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Mingjun</au><au>Zhang, Yijia</au><au>Wang, Yun</au><au>Xue, Rui</au><au>Buckley, David</au><au>Howell, D Andrew</au><au>Jin, Chichuan</au><au>Li, Wenxiong</au><au>Monageng, Itumeleng</au><au>Pan, Haiwu</au><au>Ning-Chen, Sun</au><au>Tinyanont, Samaporn</au><au>Wang, Lingzhi</au><au>Yuan, Weimin</au><au>An, Jie</au><au>Andrews, Moira</au><au>Anutarawiramkul, Rungrit</au><au>Butpan, Pathompong</au><au>Cheng, Huaqing</au><au>Cui-Yuan, Dai</au><au>Dai, Lixin</au><au>Farah, Joseph</au><au>Feng, Hua</au><au>Fu, Shaoyu</au><au>Guo, Zhen</au><au>Jiang, Shuaiqing</au><au>Li, An</au><au>Li, Dongyue</au><au>Liang, Yifang</au><au>Liu, Heyang</au><au>Liu, Xing</au><au>Liu, Yuan</au><au>Mao, Jirong</au><au>McCully, Curtis</au><au>Newsome, Megan</au><au>Estefania Padilla Gonzalez</au><au>Pan, Xin</au><au>Sun, Xinxiang</au><au>Terreran, Giacomo</au><au>Wang, Ze-Rui</au><au>Wu, Qinyu</au><au>Hubing Xiao</au><au>Xiong, Dingrong</au><au>Xu, Dong</au><au>Xu, Xinpeng</au><au>Xue, Suijian</au><au>Yang, Haonan</au><au>Yang, Jun</au><au>Zhang, Jin</au><au>Zhang, Wenda</au><au>Zhang, Wenjie</au><au>Zou, Hu</au><format>book</format><genre>document</genre><ristype>GEN</ristype><atitle>Detection of an Orphan X-ray Flare from a Blazar Candidate EP240709a with Einstein Probe</atitle><jtitle>arXiv.org</jtitle><date>2024-12-24</date><risdate>2024</risdate><eissn>2331-8422</eissn><abstract>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.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record> |
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| subjects | Blazars Infrared spectra Sky surveys (astronomy) Spectral energy distribution X-ray astronomy |
| title | Detection of an Orphan X-ray Flare from a Blazar Candidate EP240709a with Einstein Probe |
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