The case for strangulation in low-mass hosts: DDO 113
The case for strangulation in low-mass hosts: DDO 113
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DOI：
10.1093/mnras/stz3526
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发表时间：
2019-08
影响因子：
4.8
通讯作者：
C. Garling;A. Peter;C. Kochanek;D. Sand;D. Crnojevi'c
中科院分区：
文献类型：
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作者：
C. Garling;A. Peter;C. Kochanek;D. Sand;D. Crnojevi'c
我们调查的情况下，环境淬火的天炉座质量的卫星DDO 113，这是只有9千秒差距的投影，从它的主机，大麦哲伦云质量星系NGC 4214。DDO 113在大约1 Gyr前被淬灭，几乎没有气体，而该领域的类似物主要是恒星形成和富含气体。我们使用大双筒望远镜获得的深度成像显示，DDO 113没有表现出潮汐破坏的证据，表面亮度为μV <$29 mag arcsec−2，基于未分辨的发射和分辨的恒星。在2-6 Gyr前，Illustris-1中DDO 113的质量类似物具有相似的宿主，小的投影分离，并且没有显著的潮汐剥离，第一次落入其宿主晕，表明潮汐特征（或缺乏潮汐特征）可以用于限制卫星轨道上几乎没有其他限制的系统中的落入时间。随着降落时间设置时钟的环境猝灭机制，我们调查了几个这样的机制的兼容性。我们发现，扼杀，冷气体流入的停止，可能是DDO 113的主要猝灭机制，需要一个时间平均的质量加载因子η = 6-11的恒星形成驱动的流出，这是符合理论和观测的限制。受最近数值计算工作的启发，我们将DDO 113的扼杀与NGC 4214周围存在的冷环星系介质（CGM）联系起来。这一发现表明，低质量星系的CGM可以显着影响其卫星，并激发进一步了解低质量星系中的重子循环的工作。
We investigate the case for environmental quenching of the Fornax-mass satellite DDO 113, which lies only 9 kpc in projection from its host, the Large-Magellanic-Cloud-mass galaxy NGC 4214. DDO 113 was quenched about 1 Gyr ago and is virtually gas-free, while analogs in the field are predominantly star-forming and gas-rich. We use deep imaging obtained with the Large Binocular Telescope to show that DDO 113 exhibits no evidence of tidal disruption to a surface brightness of μV ∼ 29 mag arcsec−2, based on both unresolved emission and resolved stars. Mass-analogs of DDO 113 in Illustris-1 with similar hosts, small projected separations, and no significant tidal stripping first fell into their host halo 2–6 Gyr ago, showing that tidal features (or lack thereof) can be used to constrain infall times in systems where there are few other constraints on the orbit of the satellite. With the infall time setting the clock for environmental quenching mechanisms, we investigate the plausibility of several such mechanisms. We find that strangulation, the cessation of cold gas inflows, is likely the dominant quenching mechanism for DDO 113, requiring a time-averaged mass-loading factor of η = 6–11 for star-formation-driven outflows that is consistent with theoretical and observational constraints. Motivated by recent numerical work, we connect DDO 113’s strangulation to the presence of a cool circumgalactic medium (CGM) around NGC 4214. This discovery shows that the CGM of low-mass galaxies can affect their satellites significantly and motivates further work on understanding the baryon cycle in low-mass galaxies.