A3627中壮观的X射线尾、星团内恒星形成和ULX
Spectacular X-ray tails, intracluster star formation and ULXs in A3627
摘要：
我们提出了壮观的双X射线尾巴与ESO 137 -001和一个可能加热的X射线尾巴与ESO 137 -002，在最近的丰富集群阿贝尔3627晚型星系的发现。钱德拉对ESO 137 -001的深度观测使我们能够第一次详细研究这种X射线尾的空间和光谱特性。除了已知的从ESO 137 -001延伸到约80 kpc的明亮尾巴外，还令人惊讶地发现了一个长度相似的较暗和较窄的次级尾巴。沿着两个尾部的温度变化很小。我们还发现了6个X射线点源，它们可能是L（0.3-10 keV）高达2.5 × 10^40 erg s^-1的簇内ULX射线。还提供了ESO 137 -001下游星团内HII区域的双子光谱，以及这些HII区域的速度图，显示了ESO 137 -001的磁盘旋转的印记。我们第一次明确地知道，活跃的恒星形成可以发生在被ICM冲压压力剥离的冷ISM中，它可能贡献了大量的星团内光。我们还报道了在A3627中发现的另一个晚型星系ESO 137 -002的40 kpc X射线尾。它的X射线尾部似乎很热，约为2 keV（与ESO 137 -001的尾部约为0.8 keV相比）。我们认为这两个星系周围的高压环境对它们明亮的X射线尾和星系团内恒星的形成是重要的。
英文摘要：
We present the discovery of spectacular double X-ray tails associated with ESO137-001 and a possibly heated X-ray tail associated with ESO137-002, both late-type galaxies in the closest rich cluster Abell 3627. A deep Chandra observation of ESO137-001 allows us for the first time to examine the spatial and spectral properties of such X-ray tails in detail. Besides the known bright tail that extends to ~ 80 kpc from ESO137-001, a fainter and narrower secondary tail with a similar length was surprisingly revealed. There is little temperature variation along both tails. We also identified six X-ray point sources as candidates of intracluster ULXs with L(0.3-10 keV) of up to 2.5x10^40 erg s^-1. Gemini spectra of intracluster HII regions downstream of ESO137-001 are also presented, as well as the velocity map of these HII regions that shows the imprint of ESO137-001's disk rotation. For the first time, we unambiguously know that active star formation can happen in the cold ISM stripped by ICM ram pressure and it may contribute a significant amount of the intracluster light. We also report the discovery of a 40 kpc X-ray tail of another late-type galaxy in A3627, ESO137-002. Its X-ray tail seems hot, ~ 2 keV (compared to ~ 0.8 keV for ESO137-001's tails). We conclude that the high pressure environment around these two galaxies is important for their bright X-ray tails and the intracluster star formation.
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