• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >The Origin of Dust in the Early Universe: Probing the Star Formation History of Galaxies by Their Dust Content
【2h】

The Origin of Dust in the Early Universe: Probing the Star Formation History of Galaxies by Their Dust Content

机译：早期宇宙中尘埃的起源：通过尘埃含量探究星系的恒星形成历史

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two distinct scenarios for the origin of the approximately 4 x 10(exp 8) Solar Mass of dust observed in the high-redshift (z = 6.4) quasar J1148+5251 have been proposed. The first assumes that this galaxy is much younger than the age of the universe at that epoch so that only supernovae, could have produced this dust. The second scenario assumes a significantly older galactic age, so that the dust could have formed in lower-mass AGB stars. Presenting new integral solutions for the chemical evolution of metals and dust in galaxies, we offer a critical evaluation of these two scenarios. ^N;"(,, show that the AGB scenario is sensitive to the details of the galaxy's star formation history (SFH), which must consist of an early intense starburst followed by a period of low stellar activity. The presence or absence of massive amounts of dust in high-redshift galaxies can therefore be used to infer their SFH. However, a problem with the AGB scenario is that it produces a stellar mass that is significantly larger than the inferred dynamical mass of J1148+5251, an yet unresolved discrepancy. If this problem persists, then additional sites for the growth or formation of dust, such as molecular clouds or dense clouds around active galactic nuclei, must be considered.
机译：对于在高红移（z = 6.4）类星体J1148 + 5251中观测到的大约4 x 10（exp 8）太阳尘埃的起源，提出了两种不同的方案。第一个假设该星系比那个时代的宇宙年龄年轻得多，因此只有超新星才可能产生这种尘埃。第二种情况假设银河系年龄要大得多，因此尘埃可能是在质量较低的AGB星中形成的。为星系中金属和尘埃的化学演化提供新的整体解决方案，我们对这两种情况进行了重要评估。 ^ N;“（，表明AGB情景对星系的恒星形成历史（SFH）的细节敏感，该历史必须由早期强烈的星暴和随后的低恒星活动组成。是否存在大质量恒星因此，可以使用高红移星系中的大量尘埃来推断它们的SFH，但是AGB方案的问题在于，它产生的恒星质量明显大于J1148 + 5251的推断动力学质量，但尚未解决差异如果这个问题仍然存在，则必须考虑其他尘埃的生长或形成场所，例如活跃的银河核周围的分子云或致密云。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号