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arXiv 2407.02115astro-ph.GA
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AGN反馈可在星系尺度上产生金属增丰

AGN feedback can produce metal enrichment on galaxy scales

Montse Villar-Martin, Carlos López Cobá, Sara Cazzoli, Enrique Pérez Montero, Antonio Cabrera Lavers

AI总结:

本研究通过VLT MUSE光谱观测Teacup类星体的巨型星云,证实AGN驱动的外流能在星系尺度(最远10 kpc)提升气体金属丰度,揭示了AGN反馈在星系金属增丰中的作用。

摘要:

与活动星系相关的巨型(>100 kpc)星云为研究星系周围的星系周介质(CGM)、其与宿主星系星际介质(ISM)的联系以及星系演化涉及的机制提供了丰富信息。我们基于VLT MUSE积分场光谱学,研究了与Teacup(红移z=0.085)类星体相关的巨型星云,以探究已知的巨型(~10 kpc)活动星系核(AGN)驱动外流是否会对宿主星系内外的重元素分布产生影响。为此,我们通过将发射线比值与光致电离模型预测结果进行对比,绘制了巨型星云全域及星系内部的二维O/H和N/O丰度分布图。我们发现,广受研究的、造就了10 kpc电离泡的AGN驱动外流,提升了距离AGN最远10 kpc范围内的气体金属丰度。电离泡边缘的O/H丰度为太阳值或略高于太阳值,而星云其余区域的丰度低于太阳值(O/H中值约为0.63倍太阳O/H丰度)。主要结论为,AGN反馈可在星系内核外的大距离(>~10 kpc)处产生金属增丰。

英文摘要:

Giant (>100 kpc) nebulae associated with active galaxies provide rich information about the circumgalactic medium (CGM) around galaxies, its link with the interstellar medium (ISM) of the hosts and the mechanisms involved in their evolution. We have studied the giant nebula associated with the Teacup (z=0.085) quasar based on VLT MUSE integral field spectroscopy to investigate whether the well known giant (~10 kpc) active galactic nucleus (AGN) induced outflow has an impact on the distribution of heavy elements in and outside the host galaxy. For this, we have mapped the O/H and N/O abundances in two spatial dimensions across the giant nebula and within the galaxy by means of comparing emission line ratios with photoionisation model predictions. We have found that the widely studied AGN driven outflow responsible for the 10 kpc ionised bubble is enhancing the gas metal abundance up to 10 kpc from the AGN. O/H is solar or slightly higher in the bubble edges, in comparison with the subsolar abundances across the rest of the nebula (median O/H~0.63 O/H_sun)). The main conclusion is that AGN feedback can produce metal enrichment at large extranuclear distances in galaxies (>~10 kpc).

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