EAGLE and Illustris-TNG Predictions for Resolved eROSITA X-Ray Observations of the Circumgalactic Medium around Normal Galaxies
EAGLE and Illustris-TNG Predictions for Resolved eROSITA X-Ray Observations of the Circumgalactic Medium around Normal Galaxies
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EAGLE 和 Illustris-TNG 对正常星系周围环绕星系介质的解析 eROSITA X 射线观测的预测
DOI：
10.3847/2041-8213/ab846f
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
V. Ghirardini
中科院分区：
文献类型：
--
作者：
B. Oppenheimer;Á. Bogdán;R. Crain;J. Zuhone;W. Forman;J. Schaye;N. Wijers;J. Davies;C. Jones;R. Kraft;V. Ghirardini
我们在EAGLE和Illustris-TNG流体动力学模拟中模拟了与星系相关的附近热x射线日冕的叠加观测。开发了一个正演模拟管道来预测4年的eROSITA观测和叠加图像分析，包括仪器和天体物理背景的影响。我们提出了一项实验，将以特定恒星形成速率（sSFR）分隔的z≈0.01个星系堆叠起来，以研究高sSFR和低sSFR星系的热（T≥106 K）环星系介质（CGM）的差异。模拟结果表明，低质量（）、高sSFR（定义为sSFR排名前三分之一）中心星系的热CGM将在星系中心半径r≈30-50 kpc范围内被探测到。两种模拟都预测了低sSFR星系（sSFR的下三分之一）在固定恒星质量下的较低亮度，而Illustris-TNG预测的高sSFR星系周围的日冕亮度是EAGLE的3倍。这两种模拟都预测了以大质量星系为中心的堆栈可探测到的辐射高达r≈150 - 200kpc， EAGLE预测了更亮的x射线晕。扩展软x射线光度与维里半径（fCGM）内的环星系气体质量呈正相关。先前对这两种模拟的分析已经确定，主要由黑洞生长驱动的排斥性反馈减少了fCGM，排斥性反馈通过抑制星际介质的补充来抑制星系的生长。两种模拟都预测，eROSITA堆栈不仅应该首次最终探测和解决L*星系周围的热CGM，而且还应该提供一个关于重子循环如何运作的强大探测，在这方面，最先进的模拟之间仍然缺乏共识。
We simulate stacked observations of nearby hot X-ray coronae associated with galaxies in the EAGLE and Illustris-TNG hydrodynamic simulations. A forward modeling pipeline is developed to predict 4 yr eROSITA observations and stacked image analysis, including the effects of instrumental and astrophysical backgrounds. We propose an experiment to stack z ≈ 0.01 galaxies separated by specific star formation rate (sSFR) to examine how the hot (T ≥ 106 K) circumgalactic medium (CGM) differs for high- and low-sSFR galaxies. The simulations indicate that the hot CGM of low-mass ( ), high-sSFR (defined as the top one-third ranked by sSFR) central galaxies will be detectable to a galactocentric radius r ≈ 30–50 kpc. Both simulations predict lower luminosities at fixed stellar mass for the low-sSFR galaxies (the lower third of sSFR) with Illustris-TNG predicting 3× brighter coronae around high-sSFR galaxies than EAGLE. Both simulations predict detectable emission out to r ≈ 150–200 kpc for stacks centered on high-mass ( ) galaxies, with EAGLE predicting brighter X-ray halos. The extended soft X-ray luminosity correlates strongly and positively with the mass of circumgalactic gas within the virial radius (fCGM). Prior analyses of both simulations have established that fCGM is reduced by expulsive feedback driven mainly by black hole growth, which quenches galaxy growth by inhibiting replenishment of the interstellar medium. Both simulations predict that eROSITA stacks should not only conclusively detect and resolve the hot CGM around L* galaxies for the first time, but provide a powerful probe of how the baryon cycle operates, for which there remains an absence of consensus between state-of-the-art simulations.
影响因子：
4.8
作者：
B. Oppenheimer;J. Davies;R. Crain;N. Wijers;J. Schaye;J. Werk;J. Burchett;J. Trayford;Ryan Horton
通讯作者：
B. Oppenheimer;J. Davies;R. Crain;N. Wijers;J. Schaye;J. Werk;J. Burchett;J. Trayford;Ryan Horton