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arXiv 1809.07446astro-ph.HE
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宽吸收线潮汐破裂事件iPTF15af:光学和紫外演化

The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution

N. Blagorodnova, S. B. Cenko, S. R. Kulkarni, I. Arcavi, J. S. Bloom, G. Duggan, A. V. Filippenko, C. Fremling, A. Horesh, G. Hosseinzadeh, E. Karamehmetoglu, A… 展开作者

N. Blagorodnova, S. B. Cenko, S. R. Kulkarni, I. Arcavi, J. S. Bloom, G. Duggan, A. V. Filippenko, C. Fremling, A. Horesh, G. Hosseinzadeh, E. Karamehmetoglu, A. Levan, F. J. Masci, P. E. Nugent, D. R. Pasham, S. Veilleux, R. Walters, L. Yan, W. Zheng

摘要:

我们提出了多波长观测的潮汐中断事件(TDE)iPTF 15 af,发现的中间帕洛玛瞬态工厂(iPTF)调查在红移$z=0.07897$。瞬态的光学和紫外(UV)光变曲线显示出超过五个月的缓慢衰减,与以前的光学发现的TDE一致。它也有一个相当的黑体峰值亮度为$L_{\rm{peak}} \approx 1.5 \times 10^{44}$ erg/s。从光学和UV数据推断的温度显示值为(3 $-$ 5)$\times 10^4$ K。在发现后的前五个月内,在高达$L_X < 3 \times 10^{42}$ erg/s的X射线中未检测到瞬变。的光谱表现出两个不同的宽发射线在He II区域,并在稍后的时间也H $α$发射。此外,检测到来自[N III]和[O III]的发射,可能由Bowen荧光效应产生。紫外光谱显示与高电离态的N V,C IV,Si IV,并可能P V。这些功能,类似于宽吸收线类星体(BAL类星体),需要一个吸收柱密度$N_{\rm{H}} > 10^{23}$ cm $^{-2}$。这种光学上厚的气体也可以解释软X射线中无法检测到的原因。在最大速度下,具有最高柱密度物质的吸收线的轮廓与BAL类星体相反。我们认为,在早期的TDE耀斑产生的辐射压力可能提供了这种气体的初始加速机制。对未来TDE的紫外线光谱监测可以检验这一建议。

英文摘要:

We present multi-wavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory (iPTF) survey at redshift $z=0.07897$. The optical and ultraviolet (UV) light curves of the transient show a slow decay over five months, in agreement with previous optically discovered TDEs. It also has a comparable black-body peak luminosity of $L_{\rm{peak}} \approx 1.5 \times 10^{44}$ erg/s. The inferred temperature from the optical and UV data shows a value of (3$-$5) $\times 10^4$ K. The transient is not detected in X-rays up to $L_X < 3 \times 10^{42}$erg/s within the first five months after discovery. The optical spectra exhibit two distinct broad emission lines in the He II region, and at later times also H$α$ emission. Additionally, emission from [N III] and [O III] is detected, likely produced by the Bowen fluorescence effect. UV spectra reveal broad emission and absorption lines associated with high-ionization states of N V, C IV, Si IV, and possibly P V. These features, analogous to those of broad absorption line quasars (BAL QSOs), require an absorber with column densities $N_{\rm{H}} > 10^{23}$ cm$^{-2}$. This optically thick gas would also explain the non-detection in soft X-rays. The profile of the absorption lines with the highest column density material at the largest velocity is opposite that of BAL QSOs. We suggest that radiation pressure generated by the TDE flare at early times could have provided the initial acceleration mechanism for this gas. Spectral UV line monitoring of future TDEs could test this proposal.

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