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Low-redshift quasar absorption-line systems: inside and around galaxies

机译：低射频准吸收线系统：星系内外

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We present semi-analytic models and Monte-Carlo simulations of QSO Lya absorption line systems which originate in gaseous galactic halos, galaxy disks, and satellite halos around central galaxies The relation between the properties of predicted absorption lines and those of galaxies has been investigated. Using a model with galactic halos, satellites, and HI disks of spirals, 60 % of the observed strong Lya lines and all of the Lyman-limit systems can be predicted. The models predict Wr ex p~aLpB(l + z)'1 with a ~ 0,5,/? ~ 0,15,7 ~ 0.5. For strong Lya lines the average covering factor within 250/J^1 kpc is ~ 0,36, with an average absorption radius of ~ 150/J^1 kpc for a galaxy halo, in good agreement with observations. Using mock imaging and spectroscopic surveys, selection effects are found to be able to strengthen the anti-correlation between line width and projected distance. The models were also applied to quasar metal absorption lines and more realistic absorption spectra with noise were simulated.
机译：我们提出了半分析模型和Monte-Carlo模拟的QSO Lya吸收线系统，该系统源于气体半乳清晕，星系盘和卫星晕圈，围绕中央星系，预测吸收线的性质与星系的关系。使用带有银河晕，卫星和螺旋磁盘的模型，可以预测观察到的强大LYA线和所有Lyman-Limit系统的60％。该模型预测WR EX P〜ALPB（L + Z）'1〜0,5，/？ 〜0,15,7〜0.5。对于强大的LYA线，250 / J ^ 1 KPC内的平均覆盖因子为〜0.36，平均吸收半径为Galaxy Halo的平均吸收半径，与观察结果很好。使用模拟成像和光谱调查，发现选择效果能够加强线宽和投影距离之间的反相关。该模型也应用于Quasar金属吸收线，并模拟具有噪声的更现实的吸收光谱。

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