标题： 星暴和紫外波段的星团 显示英文标题

标题： Starbursts and Star Clusters in the Ultraviolet

摘要： 哈勃空间望远镜的紫外（UV）图像显示九个星暴星系是高度不规则的，即使排除了紧凑源（星团和解析恒星）。大多数（7/9）被发现具有相似的固有有效表面亮度，表明存在一种负反馈机制，设定了单位面积的恒星形成率上限。我们样本中的所有星暴都包含紫外明亮的星团，表明星团形成是星暴中重要的恒星形成模式。平均而言，约20%的紫外光度来自这些星团。最亮的星团，或超级星团（SSC），主要位于星暴的核心位置。最近的SSC的大小与银河系球状星团一致。SSC的光度函数可以用一个斜率α ~ -2的幂律很好地表示。远红外过量与紫外光谱斜率之间存在强相关性。这种相关性可以通过大部分尘埃位于星暴附近的前景屏的几何模型很好地模拟，但不能通过恒星和尘埃充分混合的几何模型来解释。 显示英文摘要

摘要： Hubble Space Telescope ultraviolet (UV) images of nine starburst galaxies reveal them to be highly irregular, even after excluding compact sources (clusters and resolved stars). Most (7/9) are found to have a similar intrinsic effective surface brightnesses, suggesting that a negative feedback mechanism is setting an upper limit to the star formation rate per unit area. All starbursts in our sample contain UV bright star clusters indicating that cluster formation is an important mode of star formation in starbursts. On average about 20% of the UV luminosity comes from these clusters. The brightest clusters, or super star clusters (SSC), are preferentially found at the very heart of starbursts. The size of the nearest SSCs are consistent with those of Galactic globular clusters. The luminosity function of SSCs is well represented by a power law with a slope alpha ~ -2. There is a strong correlation between the far infrared excess and the UV spectral slope. The correlation is well modeled by a geometry where much of their dust is in a foreground screen near to the starburst, but not by a geometry of well mixed stars and dust.