“尘埃”的版本间差异

来自Shiyin's note
跳到导航 跳到搜索
无编辑摘要
无编辑摘要
第6行: 第6行:
*尘埃与气体有关,气体的光深可以从low-ionization interstellar (IS) absorption lines(e.g., Si II, O I, Fe II)获得 (Shapley et al. 2003)
*尘埃与气体有关,气体的光深可以从low-ionization interstellar (IS) absorption lines(e.g., Si II, O I, Fe II)获得 (Shapley et al. 2003)
:e.g. If the two Si II transitions at 1260 and 1527A are optically thin, then the ratio of their equivalent widths will be W1260/W1527 > 6. The observed ratio is W1260/W1527 ~ 1, implying that the lines are saturated and hence their depths are sensitive to the covering fraction of Si II-enriched material.
:e.g. If the two Si II transitions at 1260 and 1527A are optically thin, then the ratio of their equivalent widths will be W1260/W1527 > 6. The observed ratio is W1260/W1527 ~ 1, implying that the lines are saturated and hence their depths are sensitive to the covering fraction of Si II-enriched material.
:对于比912A更短的波长来说,气体的吸收消光是最主要的而不是dust,但是气体和尘埃是相关的,参见[http://arxiv.org/abs/1606.00434]

2016年6月14日 (二) 08:54的版本

  • 消光曲线
  • 发射线的消光可能和连续谱的消光不同
  • Halpha/Hbeta 线比
内禀数值:2.86(恒星形成),3.1(AGN) 参见Osterbrock & Ferland 2006
  • 尘埃的红外发射: dustEM
  • 尘埃与气体有关,气体的光深可以从low-ionization interstellar (IS) absorption lines(e.g., Si II, O I, Fe II)获得 (Shapley et al. 2003)
e.g. If the two Si II transitions at 1260 and 1527A are optically thin, then the ratio of their equivalent widths will be W1260/W1527 > 6. The observed ratio is W1260/W1527 ~ 1, implying that the lines are saturated and hence their depths are sensitive to the covering fraction of Si II-enriched material.
对于比912A更短的波长来说,气体的吸收消光是最主要的而不是dust,但是气体和尘埃是相关的,参见[1]