室女座A II的奇特案例：关于熄灭卫星的问题
The Curious Case of Centaurus A: On the Subject of the Quenched satellites
AI总结：
研究通过分析室女座A卫星系统的异常现象，发现AGN驱动的热反馈能抑制卫星恒星形成，从而影响其矮星系卫星的生存与演化。
摘要：
室女座A的卫星系统呈现了一个奇特的宇宙谜题：虽然整体人口与理论预期一致，但其内区域（d<150kpc）显示出光亮卫星星系的匮乏。利用应用于高分辨率N-body并合树的银河系半解析模型，我们研究了潜在的熄灭机制以解释这一趋势。我们的基准模型，校准到银河系，再现了整体Cen A人口，但对Mv < -15.8的明亮内晕卫星数量的预测高出4±1倍。我们发现这并非由于统计波动。相反，这种匮乏与Cen A的庞大、千秒差距尺度的无线电泡的空间重合，表明了一个强大的环境驱动因素。我们探讨了多种物理场景，包括增强的潮汐破坏、再电离熄灭和抑制从周围星际介质向晕中吸积。我们的结果表明，AGN驱动的热反馈在z < 5时可以显著抑制卫星的恒星形成，从而有效截断内光度函数的明亮端。我们的工作表明，
英文摘要：
The satellite system of Centaurus A presents a curious cosmological puzzle: while the global population is consistent with theoretical expectations, its inner regions (d<150 kpc) exhibit a deficit of luminous satellite galaxies. Using the Galacticus semi-analytic model applied to high-resolution N-body merger trees, we investigate potential quenching mechanisms to explain this trend. Our fiducial models, calibrated to the Milky Way, reproduce the overall Cen A population but overpredict the number of bright inner-halo satellites by a factor of 4 +- 1 at Mv < -15.8. We find that this is not due to statistical variance. Instead, the spatial coincidence of this deficiency with Cen A's massive, kiloparsec-scale radio lobes suggests a powerful environmental driver. We explore a range of physical scenarios, including enhanced tidal disruption, reionization quenching, and suppressed accretion into halos from the surrounding intergalactic medium. Our results indicate that AGN-driven thermal feedback at z < 5 can significantly suppress star formation in satellites, effectively truncating the bright end of the inner luminosity function. Our work suggests that the "Curious Case of Centaurus A" may provide evidence of AGN feedback within the host galaxy that regulates the survival and evolution of its dwarf galaxy satellites.
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