矮星形成星系PHL293B中高速蓝移的FeII吸收：风驱动超壳层的证据？
High velocity blue-shifted FeII absorption in the dwarf star-forming galaxy PHL293B: Evidence for a wind driven supershell?
摘要：
本文给出了恒星形成星系PHL 293 B（也称为A2228-00和SDSS J223036.79-000636.9）的X射线和ISIS WHT光谱。我们发现布罗德（FWHM = 1000 km/s）和非常宽（FWZI = 4000 km/s）分量，巴耳末系窄吸收分量蓝移800 km/s，以前未检测到的FeII多重（42）吸收也蓝移800 km/s，IR CaII三重态恒星衍射符合[Fe/H] < -2.0，在HeI线中没有宽成分或蓝移衍射。根据历史记录，我们发现在2005年至2013年期间，在0.02 mag的5 sigma水平上没有光学变化，并且在过去24年中，在0.1 mag的水平上没有光学变化。缺乏可变性排除了瞬态现象，如发光的蓝色变量或SN IIn作为HI和Fe II蓝移的起源。证据表明，要么是一个年轻而致密的膨胀超壳层，要么是一个静止的冷却风，在这两种情况下，都是由年轻的星团风驱动的。
英文摘要：
X-shooter and ISIS WHT spectra of the starforming galaxy PHL 293B also known as A2228-00 and SDSS J223036.79-000636.9 are presented in this paper. We find broad (FWHM = 1000km/s) and very broad (FWZI = 4000km/s) components in the Balmer lines, narrow absorption components in the Balmer series blueshifted by 800km/s, previously undetected FeII multiplet (42) absorptions also blueshifted by 800km/s, IR CaII triplet stellar absorptions consistent with [Fe/H] < -2.0 and no broad components or blushifted absorptions in the HeI lines. Based on historical records, we found no optical variability at the 5 sigma level of 0.02 mag between 2005 and 2013 and no optical variability at the level of 0.1mag for the past 24 years. The lack of variability rules out transient phenomena like luminous blue variables or SN IIn as the origin of the blue shifted absorptions of HI and FeII. The evidence points to either a young and dense expanding supershell or a stationary cooling wind, in both cases driven by the young cluster wind.
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