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arXiv 2402.11665astro-ph.GAastro-ph.CO
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具有AGN的矮星系中的快速外流与明亮的He II发射

Fast Outflows and Luminous He II Emission in Dwarf Galaxies with AGN

Weizhe Liu, Sylvain Veilleux, Gabriela Canalizo, Todd M. Tripp, David S. N. Rupke, Archana Aravindan, Thomas Bohn, Fred Hamann, Christina M. Manzano-King

AI总结:

本文在三个具有AGN的矮星系中通过蓝移紫外吸收特征搜寻并确认了快速外流,发现其具有星系尺度影响和足以提供负反馈的能量,同时探测到强He II发射线,为矮星系中的AGN反馈提供了观测证据。

摘要:

尽管恒星过程被认为是矮星系中反馈的主要来源,但近年来在矮星系中不断发现的AGN引起了人们对其中的AGN反馈也加以考虑的兴趣。快速、AGN驱动的外流作为AGN反馈的主要机制,确实已在矮星系中被发现,并且可能足够强大以向其矮星宿主提供反馈。在本文中,我们在先前地面研究检查的样本中,寻找三个具有AGN的矮星系中由蓝移紫外吸收特征示踪的外流。我们确认了两个天体中由蓝移吸收特征示踪的外流,并初步探测到第三个天体中的外流。在一个多种谱线均清晰探测到外流的天体中,光致电离模型表明该外流距离AGN约0.5 kpc,意味着具有星系尺度的影响。该外流比具有相似恒星形成率的源中星暴驱动的外流快得多,并具有更高的动能外流率,很可能如模拟预测的那样,有足够的能量向其宿主星系提供负反馈。在该天体中还发现了宽得多(约4000 km s$^{-1}$)的吸收特征,其可能与类星体中宽吸收线的起源相同。此外,在谱线跃迁处于波长覆盖范围内的两个天体中均探测到了强He II $λ$1640发射,且与AGN起源一致。在这两个天体之一中,清晰探测到了蓝移的He II发射线,可能示踪了高度电离的AGN风。

英文摘要:

While stellar processes are believed to be the main source of feedback in dwarf galaxies, the accumulating discoveries of AGN in dwarf galaxies over recent years arouse the interest to also consider AGN feedback in them. Fast, AGN-driven outflows, a major mechanism of AGN feedback, have indeed been discovered in dwarf galaxies and may be powerful enough to provide feedback to their dwarf hosts. In this paper, we search for outflows traced by the blueshifted ultraviolet absorption features in three dwarf galaxies with AGN from the sample examined in our previous ground-based study. We confirm outflows traced by blueshifted absorption features in two objects and tentatively detect an outflow in the third object. In one object where the outflow is clearly detected in multiple species, photoionization modeling suggests that this outflow is located $\sim$0.5 kpc from the AGN, implying a galactic-scale impact. This outflow is much faster and possesses higher kinetic energy outflow rate than starburst-driven outflows in sources with similar star formation rates, and is likely energetic enough to provide negative feedback to its host galaxy as predicted by simulations. Much broader ($\sim$4000 km s$^{-1}$) absorption features are also discovered in this object which may have the same origin as that of broad absorption lines in quasars. Additionally, strong He II $λ$1640 emission is detected in both objects where the transition falls in the wavelength coverage, and is consistent with an AGN origin. In one of these two objects, blueshifted He II emission line is clearly detected, likely tracing a highly-ionized AGN wind.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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