Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA.
Science. 2011 Nov 18;334(6058):952-5. doi: 10.1126/science.1209850.
Outflowing winds of multiphase plasma have been proposed to regulate the buildup of galaxies, but key aspects of these outflows have not been probed with observations. By using ultraviolet absorption spectroscopy, we show that "warm-hot" plasma at 10(5.5) kelvin contains 10 to 150 times more mass than the cold gas in a post-starburst galaxy wind. This wind extends to distances > 68 kiloparsecs, and at least some portion of it will escape. Moreover, the kinematical correlation of the cold and warm-hot phases indicates that the warm-hot plasma is related to the interaction of the cold matter with a hotter (unseen) phase at >>10(6) kelvin. Such multiphase winds can remove substantial masses and alter the evolution of post-starburst galaxies.
多相等离子体的外流风被认为可以调节星系的形成，但这些外流的关键方面尚未通过观测得到探测。通过使用紫外吸收光谱学，我们表明，在一个超新星后星系风中，温度在 10(5.5)开尔文的“暖热”等离子体比冷气体多包含 10 到 150 倍的质量。这个风延伸到>68 千秒差距的距离，并且至少有一部分将逃逸。此外，冷相和暖热相的运动学相关性表明，暖热等离子体与冷物质与更高温（未观测到）相的相互作用有关，温度约为>10(6)开尔文。这种多相风可以去除大量物质并改变超新星后星系的演化。
