利用KCWI发现NGC 1275中存在空间分辨的千秒差距尺度电离外流
KCWI Discovery of a Spatially Resolved Kpc-Scale Ionized Outflow in NGC 1275
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中文总结 AI 辅助
研究利用Keck宇宙网成像仪观测NGC 1275，首次空间分辨探测到其千秒差距尺度电离外流，揭示AGN与冷气体的自调节及喷流、外流对星系反馈的作用
中文摘要 AI 辅助
我们展示了Keck Cosmic Web Imager（凯克宇宙网成像仪）对英仙座星系团最亮星系NGC 1275中心数千秒差距区域的新观测结果。这些积分场光谱数据揭示了由Hβ和[O III]双线示踪的暖电离外流，其从星系核延伸至约2.5千秒差距处。该暖电离外流由[O III]推导得出的v₅₀最大达约570 km/s，w₈₀最大达3780 km/s；由Hβ推导得出的外流质量为(2.7±0.3)×10⁶ M☉，外流质量率为2.7±0.7 M☉/年，与估计的冷分子盘吸积率（1-10 M☉/年）相当，这可能是千秒差距尺度上加速的暖风与为活动星系核（AGN）供能的秒差距尺度冷气体之间存在自调节的标志。在宿主星系中，我们探测到后退喷流方向上[O III]/Hβ比值增强，这可能暗示喷流与宿主星系际介质存在相互作用。外流成分还显示出[O III]/Hβ比值的明显增强，且与w₈₀和v₅₀呈正相关，表明存在AGN影响和/或快速激波。外流和宿主星系的[O III]/Hβ比值均随与中心距离增加而降低，显示AGN的影响被限制在中心约2千秒差距范围内。这些结果是首次对NGC 1275中千秒差距尺度电离风的分辨测量，为理解喷流和如何在复杂冷却核心星系团系统中共同作用于反馈循环提供了视角。
英文摘要
We present new Keck Cosmic Web Imager observations of the central few kiloparsecs of NGC 1275, the brightest cluster galaxy of the Perseus Cluster. These integral field spectroscopic data reveal a warm-ionized outflow traced by H$β$ and the [O III] doublet extending out to $\sim2.5$ kpc from the nucleus. The warm-ionized outflow has an [O III]-derived $v_{50}$ of up to $\sim570$ km/s, $w_{80}$ of up to $3780$ km/s, and H$β$-derived outflowing mass of $(2.7 \pm 0.3)\times 10^6$ M$_\odot$. Our H$β$-derived warm-ionized outflowing mass rate of 2.7$\pm$0.7 M$_\odot$ yr$^{-1}$ is comparable to the estimated cold molecular disk accretion rate of 1$-$10 M$_\odot$ yr$^{-1}$, which could be a sign of self-regulation between the pc-scale cold gas feeding the active galactic nucleus (AGN) and the warm wind accelerated out to kpc scales. In the host galaxy, we detect an enhancement in the [O III] / H$β$ ratio in the direction of the receding jet, which may imply jet interaction with the host interstellar medium. The outflow component also shows a clear enhancement of [O III] / H$β$ that positively correlates with $w_{80}$ and $v_{50}$, indicative of AGN influence and/or fast shocks. Both the outflow and host galaxy [O III] / H$β$ ratio decrease with increasing distance from the center, showing that the influence of the AGN is confined to the central $\sim2$ kpc. These results are the first resolved measurements of a kpc-scale ionized wind in NGC 1275 and provide a view into how both jets and winds contribute to the feedback cycles in complex cool core cluster systems.
