Local positive feedback in the overall negative: the impact of quasar winds on star formation in the FIRE cosmological simulations
Local positive feedback in the overall negative: the impact of quasar winds on star formation in the FIRE cosmological simulations
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整体负反馈中的局部正反馈：FIRE宇宙学模拟中类星体风对恒星形成的影响
DOI：
10.1093/mnras/stad2079
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发表时间：
2023
影响因子：
4.8
通讯作者：
Su, Kung Yi
中科院分区：
文献类型：
--
作者：
Mercedes-Feliz, Jonathan;Anglés-Alcázar, Daniel;Hayward, Christopher C.;Cochrane, Rachel K.;Terrazas, Bryan A.;Wellons, Sarah;Richings, Alexander J.;Faucher-Giguère, Claude-André;Moreno, Jorge;Su, Kung Yi
来自吸积超大质量黑洞的负反馈被认为是抑制星星形成和淬灭大质量星系的关键。然而，一些模型和观测表明，黑洞反馈可能有积极的影响，通过将星际介质气体压缩到更高的密度来触发星星的形成。我们调查黑洞反馈的双重作用，使用宇宙学流体动力学模拟的反馈在现实环境（FIRE）项目，结合一种新的实现超细化吸积盘风。聚焦于一个巨大的恒星形成星系atz 102（），我们证明了具有1046erg s−1动能的强类星体风，持续超过2000万年，驱动了中央气体空腔的形成，并显着降低了星系盘上星星形成的表面密度。抑制星星的形成主要是通过限制气体的可用性来形成星星，而不是通过排空预先存在的恒星形成气藏（预防性反馈优于喷射性反馈）。尽管类星体风的总体负面影响，我们确定了几个潜在的指标，当地的正反馈，包括（1）风主导的地区和恒星形成团块之间的空间关系，（2）较高的本地星星形成效率的压缩气体在空腔的边缘，（3）增加的贡献流出的材料，本地星星形成。此外，在类星体风的影响下形成的恒星往往位于更大的径向距离。我们的研究结果表明，积极和消极的AGN反馈可以共存的星系内，虽然本地的积极触发星星的形成有一个小的影响，全球星系的增长。
Negative feedback from accreting supermassive black holes is considered crucial in suppressing star formation and quenching massive galaxies. However, several models and observations suggest that black hole feedback may have a positive effect, triggering star formation by compressing interstellar medium gas to higher densities. We investigate the dual role of black hole feedback using cosmological hydrodynamic simulations from the Feedback In Realistic Environment (FIRE) project, incorporating a novel implementation of hyper-refined accretion-disc winds. Focusing on a massive, star-forming galaxy atz∼ 2 (), we demonstrate that strong quasar winds with a kinetic power of ∼1046erg s−1, persisting for over 20 Myr, drive the formation of a central gas cavity and significantly reduce the surface density of star formation across the galaxy’s disc. The suppression of star formation primarily occurs by limiting the availability of gas for star formation rather than by evacuating the pre-existing star-forming gas reservoir (preventive feedback dominates over ejective feedback). Despite the overall negative impact of quasar winds, we identify several potential indicators of local positive feedback, including (1) the spatial anticorrelation between wind-dominated regions and star-forming clumps, (2) higher local star formation efficiency in compressed gas at the edge of the cavity, and (3) increased contribution of outflowing material to local star formation. Moreover, stars formed under the influence of quasar winds tend to be located at larger radial distances. Our findings suggest that both positive and negative AGN feedback can coexist within galaxies, although the local positive triggering of star formation has a minor influence on global galaxy growth.