标题： 大质量恒星对星际介质的反馈：XMM-Newton对LMC超泡N51D的观测 显示英文标题

标题： The feedback of massive stars on the ISM: XMM-Newton view of the LMC superbubble N51D

摘要： N51D (= DEM L 192) 乍看之下是一个围绕LMC OB星协LH 54的几乎圆形、直径为120pc的电离气体泡。更深入的观察显示，存在复杂的丝状结构和径向膨胀的偏离。使用一个以N51D为中心的深XMM-Newton X射线观测，我们发现弥漫的软X射线发射气体填充了由H-alpha丝状结构所界定的超级气泡。与银河系风的最新发现相反，H-alpha和X射线表面亮度之间的相关性并不好。这种弥漫气体的X射线光谱无法用LMC的丰度模式进行拟合，而是暗示至少氧和氖的过量，这与来自II型超新星的最近富集一致。还在H-alpha壳最亮区域发现了增强混合的一些迹象，并检测到了热气体开始流出的迹象。 显示英文摘要

摘要： N51D (= DEM L 192) appears at first glance as a nearly circular, 120pc diameter bubble of ionized gas around the LMC OB association LH 54. A deeper look reveals a complex web of filaments and deviations from radial expansion. Using a deep XMM-Newton X-ray pointing centered on N51D we find that diffuse soft X-ray emitting gas fills the whole superbubble as delineated by the H-alpha filaments. Contrary to recent findings for galactic winds, the correlation between H-alpha and X-ray surface brightness is not good. The X-ray spectrum of this diffuse gas cannot be fitted with the LMC abundance pattern, but implies an overabundance of at least oxygen and neon, consistent with recent enrichment from supernovae type II. Some indications for enhanced mixing at the brightest region of the H-alpha shell and for a beginning outflow of the hot gas were also detected.