论文标题
极端低质量的星爆星河痘〜186
Blow-Away in the Extreme Low-Mass Starburst Galaxy Pox~186
论文作者
论文摘要
Pox 186是一个异常小的矮人星堡星系，拥有$ \ sim10^5 $ m $ _ {\ odot} $的出色质量。从深度21厘米观测值和[OIII]/[OII]/[OII] \（5007/3727）的HI（m $ <10^6 $ m $ _ {\ odot} $）中未检测到18.3 $ \ $ 0.11，PM $ 0.11，POX 〜186是一个有前途的候选Lyman Continum continuum continuum continuum emitter。这可能是低质量电离时代星系的可能类似物。我们提出了一项对痘痘186的空间解决的运动学研究，并确定了两个不同的电离气体成分：一个宽阔的气体成分，具有$σ> 400 $ \ kmps的宽阔研究，以及一项狭窄的气体成分，其中$σ<30 $ \ kmps。我们发现这两个组成部分之间的形态极为不同，并且直接证据的流出证据如高速度气体所示。从流出的几何形状到热的（10 $^6 $ k）星星簇风和冷却器（10 $^4 $ k）气体云之间，讨论了驱动[OIII]中高速气体创建的可能的物理机制。我们发现适度的质量流量率为0.022 m $ _ {\ odot} $ \ yr $^{ - 1} $，小质量负载系数为0.5，与其他低质量星系一致。最后，我们将Pox〜186的质量负载因子与数值模拟中的外推进行了比较，并讨论了它们之间明显差异的可能原因。
Pox 186 is an exceptionally small dwarf starburst galaxy hosting a stellar mass of $\sim10^5$ M$_{\odot}$. Undetected in HI (M $ < 10^6$ M$_{\odot}$) from deep 21 cm observations and with an [OIII]/[OII]\ (5007/3727) ratio of 18.3 $\pm$ 0.11, Pox~186 is a promising candidate Lyman continuum emitter. It may be a possible analog of low-mass reionization-era galaxies. We present a spatially resolved kinematic study of Pox 186 and identify two distinct ionized gas components: a broad one with $σ> 400$ \kmps, and a narrow one with $σ< 30$ \kmps. We find strikingly different morphologies between the two components and direct evidence of outflows as seen in the high velocity gas. Possible physical mechanisms driving the creation of high velocity gas seen in [OIII] are discussed, from outflow geometry to turbulent mixing between a hot (10$^6$ K) star-cluster wind and cooler (10$^4$ K) gas clouds. We find a modest mass-outflow rate of 0.022 M$_{\odot}$ \ yr$^{-1}$ with a small mass loading factor of 0.5, consistent with other low mass galaxies. Finally we compare the mass-loading factor of Pox~186 with extrapolations from numerical simulations and discuss possible reasons for the apparent discrepancy between them.
