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首页> 外文期刊>The Astrophysical journal >THE NATURE OF DAMPED Lyα ABSORBING GALAXIES AT z ≤ 1: A PHOTOMETRIC REDSHIFT SURVEY OF DAMPED Lyα ABSORBERS
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THE NATURE OF DAMPED Lyα ABSORBING GALAXIES AT z ≤ 1: A PHOTOMETRIC REDSHIFT SURVEY OF DAMPED Lyα ABSORBERS

机译：z≤1时的阻尼Lyα吸收星系的性质：阻尼Lyy吸收剂的光度Redshift研究

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We study the nature of damped Lyα absorption (DLA) systems at z ≤ 1 using a sample of 11 DLA galaxies, for which accurate redshift measurements are available. Five of the 11 systems are identified in our ongoing photometric redshift survey of DLA galaxies, while the remaining six systems are identified by previous groups using either spectroscopic or photometric redshift techniques. Absolute B-band magnitudes of the galaxies range from M_(AB)(B) = -15.3 to -20.3. Impact parameter separations of the galaxy and absorber pairs range from ρ = 0.31 to 25.4 h~(-1) kpc. We first demonstrate that the precision of photometric redshifts is sufficient for identifying DLA galaxies because DLA systems are rare, and their intrinsically high column density implies a small impact parameter of the host galaxy to the QSO line of sight. We then adopt this first large DLA galaxy sample to study the neutral gas cross section of intermediate-redshift galaxies and examine the optical properties of DLA galaxies at z ≤ 1. The results of our study are as follows: (1) the extent of neutral gas around intermediate-redshift galaxies scales with B-band luminosity as R/R_* = (L_B/L_(B_*))~β with R_* = 24-30 h~(-1) kpc and β = 0.26_(-0.06)~(+0.24) at N(H ?) = 10~(20) cm~(-2); (2) the observed incidence of the DLA systems versus the B-band luminosity of the DLA galaxies is consistent with models derived from adopting a known galaxy B-band luminosity function and the best-fit scaling relation of the neutral gas cross section at M_(AB) (B) - 5 log h ≤ -17; (3) comparison of the observed and predicted number density of DLA systems supports that luminous galaxies can explain most of the DLA systems found in QSO absorption line surveys and a large contribution of dwarfs (M_(AB)(B) -5 log h ≥ -17). to the total neutral gas cross section is not necessary; (4) of the 11 DLA systems studied, 45% are disk dominated, 22% are bulge dominated, 11% are irregular, and 22% are in galaxy groups, indicating that galaxies that give rise to the DLA systems span a wide range of morphological types and arise in a variety of galaxy environments; and (5) galaxies that contain the bulk of neutral gas in the universe do not appear to exhibit a substantial luminosity evolution between z = 0 and 1.
机译：我们使用11个DLA星系样本对z≤1的阻尼Lyα吸收（DLA）系统的性质进行了研究，可获得准确的红移测量结果。在我们正在进行的DLA星系的光度红移调查中确定了11个系统中的5个，而其余6个系统是由先前的小组使用光谱或光度红移技术确定的。星系的绝对B波段大小范围为M_（AB）（B）= -15.3至-20.3。银河系和吸收体对的碰撞参数间隔范围为ρ= 0.31至25.4 h〜（-1）kpc。我们首先证明光度红移的精度足以识别DLA星系，因为DLA系统很少见，并且它们固有的高列密度意味​​着宿主星系对QSO视线的影响参数较小。然后，我们采用第一个大型DLA星系样本研究中红移星系的中性气体横截面，并研究z≤1时DLA星系的光学性质。我们的研究结果如下：（1）中性程度中间红移星系周围的气体标度为B波段亮度为R / R_ * =（L_B / L_（B _ *））〜β，R_ * = 24-30 h〜（-1）kpc和β= 0.26 _（-在N（H）＝ 10〜（20）cm〜（-2）时为0.06）〜（+0.24）； （2）观察到的DLA系统相对于DLA星系B带光度的发生率与采用已知星系B带光度函数和M_处中性气体横截面的最佳拟合比例关系得出的模型一致（AB）（B）-5 log h≤-17; （3）DLA系统观测密度和预测密度的比较表明，发光星系可以解释QSO吸收线调查中发现的大多数DLA系统以及矮星（M_（AB）（B）-5 log h≥ -17）。总中性气体横截面是没有必要的； （4）在研究的11个DLA系统中，有45％由磁盘控制，22％由凸出控制，11％不规则，以及22％在银河系中，这表明产生DLA系统的星系范围很广。形态类型并出现在各种星系环境中； （5）宇宙中包含大量中性气体的星系在z = 0和1之间似乎没有表现出明显的光度演化。

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