离核潮汐瓦解事件在晚期阶段的发现:TDE 2023mfm 的案例
An Off-Nuclear Tidal Disruption Event Discovered At Late Times: The Case Of TDE 2023mfm
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中文总结 AI 辅助
该研究报道了TDE 2023mfm的发现与分析,它源自宿主星系中心的漫游黑洞,具有离核偏移、高温持续和晚期射电辐射等特征,为理解潮汐瓦解事件提供了新案例。
中文摘要 AI 辅助
我们展示了光学选择的潮汐瓦解事件(TDE)2023mfm 的发现与分析,该事件源自一个位于大质量(约 10^11 太阳质量)星系中的漫游大质量黑洞(MBH),该星系中心存在一个低光度活动星系核(AGN)。我们对 ZTF、Lick、Keck、Swift、Chandra、XMM-Newton、HST 和 VLA 观测数据的分析表明,TDE 2023mfm 是一个 TDE-H,源自一个质量为 10^(6.2±0.5) 太阳质量的黑洞,该黑洞偏离其宿主星系中心 0.66±0.02 角秒,对应的投影距离为 1.08±0.04 千秒差距。TDE 2023mfm 展现出光学选择 TDE 的所有特征。其辐射在峰值后一个多月内保持高温,黑体温度约为 22,000±1,000 开尔文,g 波段光变曲线峰值光度为 (2.24^(+0.10)_(-0.11))×10^43 尔格每秒,并保持高于半极大光度 47.8^(+3.7)_(-3.5) 天。HST 观测到的晚期光学到紫外辐射表明,在 TDE 位置存在一个未分辨的恒星族群,其恒星质量为 10^7-10^8 太阳质量,可能是一个低质量矮星系或先前小型并合中剥离的星系。TDE 2023mfm 的射电辐射在光学发现至少一年后才出现,我们发现它可能源自延迟的外流,然而需要进一步观测来确定其真正起源。
英文摘要
We present the discovery and analysis of the optically selected tidal disruption event (TDE) 2023mfm, which originates from a wandering massive black hole (MBH) in a massive ($\sim 10^{11} \,$M$_{\odot}$) galaxy hosting a central low-luminosity active galactic nucleus (AGN). Our analysis of the ZTF, Lick, Keck, Swift, Chandra, XMM-Newton, HST, and VLA observations reveals that TDE 2023mfm is a TDE-H from a $10^{6.2 \pm 0.5}\,$M$_{\odot}$ black hole which is offset by $0.66 \pm 0.02$" from the center of its host galaxy, corresponding to a projected distance of $1.08 \pm 0.04$ kpc. TDE 2023mfm displays all the traits of optically selected TDEs. The emission remains hot, $T_{\rm bb} \sim 22,000 \pm 1,000$ K, for more than a month after peak, and the $g$-band light curve peaks at $\left( 2.24^{+0.10} _{-0.11} \right) \times 10^{43} \, \rm erg \, s^{-1}$ and stays above half-maximum luminosity for $47.8^{+3.7}_{-3.5}$ days. The late-time optical-to-UV emission observed with the HST suggests the presence of an unresolved stellar population with a stellar mass of $10^7-10^8\,$M$_{\odot}$ at the position of the TDE, possibly being a low-mass dwarf galaxy or a stripped galaxy from a previous minor merger. The radio emission from TDE 2023mfm emerges at least a year after optical discovery, and we find it likely that it originates from a delayed outflow, however, further observations are needed to determine its true origin.
发表机构
- University of California, Berkeley(加州大学伯克利分校)
- Peking University(北京大学)
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