The physical states of the intergalactic medium constrained by the x-ray spectra of high-z agn

Lin wen Chen*, Andy C. Fabian

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

We use ROSAT/ASCA X-ray spectra of high-redshift AGNs to study the intergalactic medium in the deep Universe. Because the primordial gas is likely completely ionized but not the intergalactic metals, some soft X-ray absorption features are therefore expected to be detected in the spectra of distant AGNs. We have calculated the ionization state of a metal-rich IGM, and applied the model to the joint ASCA-ROSAT X-ray spectral analysis of four AGNs at redshifts ranging from 1.8 and up to nearly 5. This test provides a constraint on the temperature and density of the IGM, which gives a well consistent picture of the physical properties of the IGM, in comparison with the results obtained from the traditional Gunn-Peterson test, and constraints given by both the cosmic microwave background and the X-ray background.

原文英語
頁(從 - 到)1881-1884
頁數4
期刊Advances in Space Research
26
發行號11
DOIs
出版狀態已發佈 - 2000 一月 1
對外發佈

ASJC Scopus subject areas

  • 航空工程
  • 天文和天體物理學
  • 地球物理
  • 大氣科學
  • 空間與行星科學
  • 地球與行星科學(全部)

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