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arXiv 2405.04411astro-ph.HEastro-ph.COastro-ph.GAgr-qc
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LISA大质量黑洞双星中由吸积介导的自旋-偏心率关联

Accretion mediated spin-eccentricity correlations in LISA massive black hole binaries

Mudit Garg, Christopher Tiede, Daniel J. D'Orazio

AI总结:

本研究探究LISA频段内合并前一年、嵌入环双星盘的等质量大质量黑洞双星的自旋-偏心率关联,发现逆行吸积系统中可测偏心率与负有效自旋强相关,顺行吸积则相反,为揭示其形成通道提供新途径。

摘要:

我们研究了在LISA(激光干涉空间天线)频段内合并前一年,嵌入在环双星盘(circumbinary disc, CBD)中、总红移质量$M_z\boldsymbol{\rm \tilde{}}[10^{4.5},10^{7.5}]~{\rm M}_\boldsymbol{\rm \bullet}$的可观测等质量大质量黑洞双星(massive black hole binaries, MBHBs)族群的预期有效自旋($\boldsymbol{\rm \tilde{}}_{{\rm eff},1\rm yr}$)与轨道偏心率($e_{1\rm yr}$)的关联。我们发现,对于由逆行吸积驱动至合并的MBHBs,可测量的偏心率与负有效自旋之间存在强关联。这是由于已被充分证实的逆行吸积的偏心率泵浦效应,以及如流体动力学模拟中所观测到的、与逆行CBD对齐的小质量盘的形成。相反,顺行吸积通道会导致正的$\boldsymbol{\rm \tilde{}}_{{\rm eff},1\rm yr}$和不可测量的$e_{1\rm yr}$。两种CBD取向之间的这种鲜明对比——尤其是逆行构型的独特特征——为在LISA时代揭开MBHB形成通道的奥秘提供了一种很有前景的方法。

英文摘要:

We examine expected effective spin ($χ_{{\rm eff},1\rm yr}$) and orbital eccentricity ($e_{1\rm yr}$) correlations for a population of observable equal-mass massive black hole binaries (MBHBs) with total redshifted mass $M_z\sim[10^{4.5},10^{7.5}]~{\rm M}_\odot$ embedded in a circumbinary disc (CBD), one-year before merging in the LISA band. We find a strong correlation between measurable eccentricity and negative effective spin for MBHBs that are carried to merger by retrograde accretion. This is due to the well-established eccentricity pumping of retrograde accretion and the formation of retrograde CBD-aligned mini-discs, as observed in hydrodynamical simulations. Conversely, prograde accretion channels result in positive $χ_{{\rm eff},1\rm yr}$ and non-measurable $e_{1\rm yr}$. This clear contrast between the two CBD orientations - and particularly the unique signature of retrograde configurations - provides a promising way to unlock the mysteries of MBHB formation channels in the LISA era.

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