A Luminous Dust-obscured Tidal Disruption Event Candidate in a Star-forming Galaxy at 42 Mpc
A Luminous Dust-obscured Tidal Disruption Event Candidate in a Star-forming Galaxy at 42 Mpc
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DOI：
10.3847/2041-8213/acc02f
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发表时间：
2023-03
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通讯作者：
C. Panagiotou;K. De;Megan Masterson;E. Kara;M. Calzadilla;A. Eilers;Danielle Frostig;V. Karambelkar;M. Kasliwal;N. Lourie;A. Meisner;R. Simcoe;R. Stein;J. Zolkower
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作者：
C. Panagiotou;K. De;Megan Masterson;E. Kara;M. Calzadilla;A. Eilers;Danielle Frostig;V. Karambelkar;M. Kasliwal;N. Lourie;A. Meisner;R. Simcoe;R. Stein;J. Zolkower
虽然绝大多数潮汐扰乱事件(TDEs)是通过光学和X射线波段的广域天文观测确定的，但最近的研究表明，相当一部分TDEs可能被尘埃遮挡，因此优先在红外(IR)波段探测到。在这封信中，我们介绍了一个发光的中红外核耀斑(称为WTP14adbjsh)的发现，它是在对NEOWISE中红外调查的档案图像进行的系统瞬时搜索中确定的。该源在2015年达到峰值光度L≃1043erg S−1在4.6erg米，然后随着类似μ的F∝t−5/3的下降而在IR中衰减，在过去的7年中总共辐射了超过3×1051erg。这一瞬变事件发生在附近的NGC7392星系中，距离约42Mpc；然而，没有探测到光学或X射线耀斑。我们将这一瞬变现象解释为过去十年中探测到的最接近的TDE候选者，由于尘埃遮挡而在其他波长未能探测到，这暗示着历史上被忽视的TDEs的存在。与之前发现的大多数TDEs不同，该瞬变是在恒星形成星系中发现的，这证实了早先的说法，即尘埃遮挡显著抑制了TDEs在这些环境中的检测。我们的结果表明，对于红外探测到的TDEs的研究对于全面了解TDEs的物理以及得出TDEs是否优先出现在特定的星系类中是至关重要的。
While the vast majority of tidal disruption events (TDEs) have been identified by wide-field sky surveys in the optical and X-ray bands, recent studies indicate that a considerable fraction of TDEs may be dust obscured and thus preferentially detected in the infrared (IR) wave bands. In this Letter, we present the discovery of a luminous mid-IR nuclear flare (termed WTP14adbjsh), identified in a systematic transient search of archival images from the NEOWISE mid-IR survey. The source reached a peak luminosity of L ≃ 1043 erg s−1 at 4.6 μm in 2015 before fading in the IR with a TDE-like F ∝ t −5/3 decline, radiating a total of more than 3 × 1051 erg in the last 7 yr. The transient event took place in the nearby galaxy NGC 7392, at a distance of around 42 Mpc; yet, no optical or X-ray flare is detected. We interpret the transient as the nearest TDE candidate detected in the last decade, which was missed at other wavelengths due to dust obscuration, hinting at the existence of TDEs that have been historically overlooked. Unlike most previously detected TDEs, the transient was discovered in a star-forming galaxy, corroborating earlier suggestions that dust obscuration suppresses significantly the detection of TDEs in these environments. Our results demonstrate that the study of IR-detected TDEs is critical in order to obtain a complete understanding of the physics of TDEs and to conclude whether TDEs occur preferentially in a particular class of galaxies.