标题： 星系的气体范围和类星体吸收线系统的起源 显示英文标题

标题： The Gaseous Extent of Galaxies and The Origin of QSO Absorption Line Systems

摘要： 我们呈现了一个正在进行的项目的结果，该项目旨在研究星系的气体范围以及类星体吸收线系统的起源。 对于\lya 吸收系统，我们发现吸收等效宽度与星系撞击参数和星系$B$-波段光度密切相关，并且单个星系的气体范围与星系$B$-波段光度成$r\propto L_B^{0.40\pm0.09}$比例。 将结果应用于哈勃深场中的星系，以计算\lya 吸收线的预测数密度随红移的变化，并与观测结果进行比较，我们发现至少50%甚至可能多达100%的\lya 吸收系统，其中$W\apg0.32$ \AA 可以由正常星系的扩展气体包层来解释。 对\civ 吸收线系统也进行了反相关分析，结果表明电离气体截面与星系$B$-波段光度成$r\propto L_B^{0.76\pm0.26}$比例。 显示英文摘要

摘要： We present results of an ongoing program to study the gaseous extent of galaxies and the origin of QSO absorption line systems. For \lya absorption systems, we find that absorption equivalent width depends strongly on galaxy impact parameter and galaxy $B$-band luminosity, and that the gaseous extent of individual galaxies scales with galaxy $B$-band luminosity as $r\propto L_B^{0.40\pm0.09}$. Applying the results to galaxies in the Hubble Deep Field to calculate the predicted number density of \lya absorption lines as a function of redshift and comparing it with observations, we find that at least 50% and perhaps as much as 100% of \lya absorption systems with $W\apg0.32$ \AA can be explained by the extended gaseous envelops of normal galaxies. The anti-correlation analysis has also been performed on \civ absorption line systems, and the results show that the ionized gas cross section scales with galaxy $B$-band luminosity as $r\propto L_B^{0.76\pm0.26}$.