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arXiv 0909.3878astro-ph.IMastro-ph.CO
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宇宙起源摄谱仪的远紫外灵敏度

Far-UV sensitivity of the Cosmic Origins Spectrograph

Stephan R. McCandliss, Kevin France, Steven Osterman, James C. Green, Jason B. McPhate, Erik Wilkinson

摘要:

我们证明了最近安装在{ \it Hubble Space Telescope(HST)}上的宇宙起源摄谱仪(Cosmic Origins Spectrograph,COS)的G140 L段B通道在912 nm处的莱曼边和莱曼$β$之间的带通中具有与$\sim$ 10 cm $^2$一致的有效面积,在1130 nm处上升到超过1000 cm $^2$的峰值。这是{ \it HST}的新波长范围,将为独特的科学研究提供机会。特别是,寻求量化来自低红移星系的莱曼连续谱光子的逃逸分数的研究,确定红移范围2 $< z \lesssim$ 2.8的总银河系电离背景中硬度变化的标度长度,用$A_V >$ 3测量稠密星际环境中CO与H的比率$_2$,或利用\ion{O}{6} $λλ$ 1032的高温诊断能力,1038双合现在可以以前所未有的灵敏度进行。

英文摘要:

We demonstrate that the G140L segment B channel of the Cosmic Origins Spectrograph (COS) recently installed on the {\it Hubble Space Telescope (HST)} has an effective area consistent with $\sim$ 10 cm$^2$ in the bandpass between the Lyman edge at 912 Åand Lyman $β$, rising to a peak in excess of 1000 cm$^2$ longward of 1130 Å. This is a new wavelength regime for {\it HST} and will allow opportunities for unique science investigations. In particular, investigations seeking to quantify the escape fraction of Lyman continuum photons from galaxies at low redshift, determine the scale-length of the hardness variation in the metagalactic ionizing background over the redshift range 2 $< z \lesssim$ 2.8, measure the ratio of CO to H$_2$ in dense interstellar environments with $A_V >$ 3, or harness the high temperature diagnostic power of the \ion{O}{6} $λλ$ 1032, 1038 doublet can now be carried out with unprecedented sensitivity.

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