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arXiv 2409.10486astro-ph.HEastro-ph.GA
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准周期性爆发与潮汐瓦解事件之间的宿主星系形态关联

A Host Galaxy Morphology Link Between Quasi-Periodic Eruptions and Tidal Disruption Events

Olivier Gilbert, John J. Ruan, Michael Eracleous, Daryl Haggard, Jessie C. Runnoe

AI总结:

本研究通过对比9个X射线准周期性爆发(QPE)宿主星系与13个潮汐瓦解事件(TDE)宿主星系的形态参数,发现二者均具有高Sersic指数、高核球总光度比及高恒星表面质量密度,从宿主星系形态层面佐证了QPE与TDE存在物理关联。

摘要:

近期在数个低红移星系核区发现的X射线准周期性爆发(QPEs)的物理产生机制尚不明确。多项观测证据强烈表明QPEs与潮汐瓦解事件(TDE)之间存在关联。此前研究还揭示,与更广泛的星系族群相比,TDE宿主星系的形态高度集中,具有更高的Sersic指数、核球与总光度比(B/T)以及恒星表面质量密度。我们利用这些独特性质,通过比较QPE宿主星系与TDE宿主星系的上述参数,来检验QPE与TDE之间的关联。我们采用了9个QPE宿主星系样本和13个TDE宿主星系样本的Legacy巡天存档图像,并对它们的表面亮度轮廓进行建模。研究表明,QPE宿主星系具有约3的高Sersic指数、约0.5的高B/T比,以及约10^10 Msun kpc^-2的高表面质量密度。这些性质与TDE宿主星系相似,但与质量和红移匹配的对照星系样本形成强烈反差。我们还发现了初步证据,表明QPE和TDE宿主星系的中心黑洞质量相对于其恒星质量而言偏低。族群层面上QPE与TDE宿主星系的形态相似性,进一步佐证了这两类现象之间存在物理关联的越来越多的证据,并且支持那些同样涉及TDE的QPE模型。

英文摘要:

The physical processes that produce X-ray Quasi-Periodic Eruptions (QPEs) recently discovered from the nuclei of several low-redshift galaxies are mysterious. Several pieces of observational evidence strongly suggest a link between QPEs and Tidal Disruption Events (TDE). Previous studies also reveal that the morphologies of TDE host galaxies are highly concentrated, with high Sersic indicies, bulge-to-total light (B/T) ratios, and stellar surface mass densities relative to the broader galaxy population. We use these distinctive properties to test the link between QPEs and TDEs, by comparing these parameters of QPE host galaxies to TDE host galaxies. We employ archival Legacy Survey images of a sample of 9 QPE host galaxies and a sample of 13 TDE host galaxies, and model their surface brightness profiles. We show that QPE host galaxies have high Sersic indices of ~3, high B/T ratios of ~0.5, and high surface mass densities of ~10^10 Msun kpc^-2. These properties are similar to TDE host galaxies, but are in strong contrast to a mass- and redshift-matched control sample of galaxies. We also find tentative evidence that the central black holes in both QPE and TDE host galaxies are undermassive relative to their stellar mass. The morphological similarities between QPE and TDE host galaxies at the population level add to the mounting evidence of a physical link between these phenomena, and favor QPE models that also invoke TDEs.

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