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Einstein Probe Discovery of EP J182730.0-095633: A New Black Hole X-Ray Binary Candidate in Faint Outburst?

文献类型：期刊论文

作者Cheng, H. Q.32; Zhao, Q. C.30,31; Tao, L.31; Feng, H.31; Coti Zelati, F.28,29; Pan, H. W.32; Wang, A. L.31; Wang, Y. N.32; Ge, M. Y.31; Rau, A.22
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2025-10-01
卷号991期号:2页码:L41
ISSN号2041-8205
DOI10.3847/2041-8213/adf104
产权排序25
英文摘要Black hole X-ray binaries (candidates) currently identified in our Galaxy are mainly transient sources, with the majority discovered through the detection of their X-ray outbursts. Among these, only four were found during faint outbursts exhibiting peak X-ray luminosities LX less than or similar to 1036 erg s-1, likely due to the previous lack of sensitive, wide-field monitoring instruments in the X-ray band. In this Letter, we present the discovery of an intriguing X-ray transient, EP J182730.0-095633, via the Einstein Probe (EP) and subsequent multiwavelength follow-up studies. This transient, located on the Galactic plane, experienced a faint and brief X-ray outburst lasting about 20 days. Its X-ray spectrum is nonthermal and consistent with a power-law model with a nearly constant photon index of Gamma similar to 2 throughout the outburst. A long-lasting mHz quasiperiodic oscillation signal was detected in its X-ray light curve, centered around a frequency of similar to 0.04 Hz. A transient near-infrared source was identified as its counterpart, although no optical emission was detectable, likely due to significant extinction. A radio counterpart was also observed, displaying an inverted radio spectrum with alpha similar to 0.45. The X-ray spectral and temporal characteristics, along with the multiwavelength properties, indicate that the source is a faint low-mass X-ray binary, with the compact object likely being a black hole. This work demonstrates the potential of the EP in discovering new X-ray binaries by capturing faint-level X-ray outbursts.
WOS关键词QUASI-PERIODIC OSCILLATIONS ; ADVECTION-DOMINATED ACCRETION ; GAMMA-RAY ; LIGHT CURVES ; PHYSICAL PROCESSES ; GALACTIC-CENTER ; NEUTRON-STAR ; MULTIWAVELENGTH OBSERVATIONS ; TIDAL DISRUPTION ; COMPLETE SAMPLE
资助项目Strategic Priority Program on Space Science of the Chinese Academy of Sciences ; ESA ; MPE ; CNES ; National Natural Science Foundation of China[12203071] ; National Natural Science Foundation of China[12333004] ; National Natural Science Foundation of China[12122306] ; National Natural Science Foundation of China[12173048] ; National Natural Science Foundation of China[12473047] ; National Natural Science Foundation of China[12473016] ; National Natural Science Foundation of China[12373049] ; National Natural Science Foundation of China[12433007] ; National Natural Science Foundation of China[12361131579] ; National Key Research and Development Program of China[2023YFA1607903] ; National Key Research and Development Program of China[2024YFA1611603] ; National Key Research and Development Program of China[2024YFA1611604] ; National SKA Program of China[2022SKA0130100] ; Tianshan Talent Training Program[2023TSYCCX0101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0550200] ; Danish National Research Foundation[817661] ; European Research Council (ERC) via the consolidator grant MAGNESIA ; UK Space Agency[101189496] ; Proof-of-concept grant DeepSpacePULSE ; European Union (ERC)[PID2023-153099NA-I00] ; Spanish grant ; Catalan grant[SGR 2021-01269] ; Program Unidad de Excelencia Maria de Maeztu[CEX2020-001058-M] ; Ramon y Cajal fellowship[RYC2021-030888-I] ; INAF[1.05.23.04.04] ; Independent Research Fund Denmark[DFF-4090-00079] ; Carlsberg Foundation ; China Postdoctoral Science Foundation[2025T180874] ; China Postdoctoral Science Foundation[2025M773197] ; [DNRF140] ; [101095973]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001579068600001
出版者IOP Publishing Ltd
资助机构Strategic Priority Program on Space Science of the Chinese Academy of Sciences ; ESA ; MPE ; CNES ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National SKA Program of China ; Tianshan Talent Training Program ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Danish National Research Foundation ; European Research Council (ERC) via the consolidator grant MAGNESIA ; UK Space Agency ; Proof-of-concept grant DeepSpacePULSE ; European Union (ERC) ; Spanish grant ; Catalan grant ; Program Unidad de Excelencia Maria de Maeztu ; Ramon y Cajal fellowship ; INAF ; Independent Research Fund Denmark ; Carlsberg Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.xao.ac.cn/handle/45760611-7/8202]  
专题光学天文与技术应用研究室_变星研究团组
通讯作者Tao, L.
作者单位1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210023, Peoples R China
2.Radboud Univ Nijmegen, Dept Astrophys, IMAPP, OB 9010, NL-6500 GL Nijmegen, Netherlands
3.ESA ESTEC, NL-2201 AZ Noordwijk, Netherlands
4.Univ Copenhagen, Niels Bohr Inst, Jagtvej 128, DK-2200 Copenhagen, Denmark
5.Cosm Dawn Ctr DAWN, Copenhagen, Denmark
6.Yunnan Univ, South Western Inst Astron Res, Kunming 650504, Yunnan, Peoples R China
7.Univ Oxford, Dept Phys, Astrophys, Keble Rd, Oxford OX1 3RH, England
8.Chinese Acad Sci, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China
9.Chinese Acad Sci, Innovat Acad Microsatellites, Shanghai 201210, Peoples R China
10.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, H. Q.,Zhao, Q. C.,Tao, L.,et al. Einstein Probe Discovery of EP J182730.0-095633: A New Black Hole X-Ray Binary Candidate in Faint Outburst?[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,991(2):L41.
APA Cheng, H. Q..,Zhao, Q. C..,Tao, L..,Feng, H..,Coti Zelati, F..,...&Zhang, Y. H..(2025).Einstein Probe Discovery of EP J182730.0-095633: A New Black Hole X-Ray Binary Candidate in Faint Outburst?.ASTROPHYSICAL JOURNAL LETTERS,991(2),L41.
MLA Cheng, H. Q.,et al."Einstein Probe Discovery of EP J182730.0-095633: A New Black Hole X-Ray Binary Candidate in Faint Outburst?".ASTROPHYSICAL JOURNAL LETTERS 991.2(2025):L41.

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