I review current results from searching for galaxies giving rise to damped Lya absorbers (DLAs) at z < 1 Using 14 confirmed DLA galaxies, I further show that inteimediate-redshift galaxies possess a large HI envelope out to 24 - 30 h^1 kpc in radius. The photometric and spectral properties of these galaxies confirm that DLA galaxies are drawn from the typical field population, and not from a separate population of low surface brightness or dwarf galaxies-^sThe spatial distribution of metals in the cold ISM of intermediate-redshift galaxies is characterised by a radial gradient of -0.041 ± 0.012 dex per kiloparsec (or equivalently a scale length of 10 6 h^1 kpc) to 30 h"1 kpc radius based on an ensemble of six galaxy-DLA pairs Adopting this abundance gradient and known AT (HI) profiles of nearby galaxies, I show that the observed low metal content of the DLA population can arise naturally as a combination of gas cross-section selection and metallicity gradients commonly observed in local disk galaxies.
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机译：我审查了目前的结果搜索了在Z <1的使用14确认的DLA星系的Z <1产生了阻尼LYA吸收剂（DLAS），我进一步表明INTEMEDIED-REDSHIFT星系与24 - 30 H ^ 1 KPC的大型嗨信封。半径。这些星系的光度和光谱特性证实了DLA星系是从典型的场群中汲取的，而不是从中间 - 红星的冷ISM中单独的低表面亮度或矮化星系的单独亮度或矮化星系的空间分布。以径向梯度为特征为-0.041±0.012 dex /千柱（或等效的量长度为10 6 h ^ 1 kpc）至30h“1kpc半径，基于采用这种丰富梯度和已知的六个Galaxy-DLA对的集合在附近星系的（HI）轮廓上，我表明，观察到的DLA群体的低金属含量可以自然地出现，因为在局部盘星形中通常观察到的气体横截面选择和金属梯度的组合。
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