The distribution and baryon content of H i absorbers at z < 0.5

机译：H i吸收器的分布和屈曲含量在z <0.5

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We combine FUV spectra obtained with FUSE and STIS/E140M of HE 0226-4116 (z = 0 495), PG 1116+215 (zem = 0,177), and PG 1259+593 (zem = 0 478) to determine the distribution of column density and Doppier width of the Lya absorber population at z < 0.5 detected in the spectra of these 3 quasars. The high spectral resolution UV spectra allow us to derive simultaneously the redshift, column density, and Doppler width of each absorber. Two different populations of H I absorbers appear to be present: narrow and broad H I absorptions that could be tracers of the warm photoionised IGM (T < 105 K) and warm-hot ionised medium (WHIM, T ~ 105 - 106 K), For a reliable assessment of the baryonic content of the Lya forest at low z it is crucial to determine the relative numbers of photoionised absorbers vs. hot collisionally ionised absorbers. Preliminary results indicate that 30-40% of the total baryons are in the photoionised IGM and at least 20% in the WHIM We also discuss the observed evolution of the Doppler parameter with redshift.

机译：我们将获得的FUV光谱与HE 0226-4116（Z = 0 495），PG 1116 + 215（ZEM = 0,177），PG 1259 + 593（ZEM = 0 478）相结合，以确定列的分布Lya吸收器宽度和Z <0.5在这3 Quasars的光谱中检测到的Z <0.5的厚度。高光谱分辨率UV光谱允许我们同时导出每个吸收器的红移，列密度和多普勒宽度。 HI吸收剂的两种不同群体似乎存在：窄且宽的HI吸收吸收，其可以是温暖的光上IgM（T <105 k）和暖热电泡培养基的示踪剂（WHIM，T〜105-106 k），在低Z时对Lya森林的辐射含量的可靠性评估它至关重要，以确定光离子吸收剂与热牢固电离吸收剂的相对数量是至关重要的。初步结果表明，30-40％的全重组在光上的IgM中，并且在突发血上至少20％，我们还讨论了用红移观察到多普勒参数的演变。

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《International Astronomical Union》|2005年||共6页
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N. Lehner; B. D Savage; B. P Wakker; K. R Sembach; T. M Tripp;
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The distribution and baryon content of H i absorbers at z < 0.5

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