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首页> 外文期刊>The Astrophysical journal >THE z = 0.8596 DAMPED Lyα ABSORBING GALAXY TOWARD PKS 0454 + 039
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THE z = 0.8596 DAMPED Lyα ABSORBING GALAXY TOWARD PKS 0454 + 039

机译：z = 0.8596阻尼Lyα吸收银杏向PKS 0454 + 039

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摘要

We present Hubble Space Telescope and ground-based data on the z_(abs) = 0.8596 metal-line absorption system along the line of sight to PKS 0454 + 0356. The system is a moderate-redshift damped Lyα system, with N(H I) = (5.7 ± 0.3) x 10~(20) cm~(-2) as measured from the faint Object Spectrograph spectrum. We also present ground-based images which we use to identify the galaxy which most probably gives rise to the damped system; the most likely candidate is relatively underluminous by QSO absorber standards (M_B ～ —19.0 for q_0 = 0.5 and H_0 = 50 km s~(-1) Mpc~(-1)) and lies ～8.5 h~(-1) kpc in projection from the QSO sight line. Ground-based measurements of Zn II, Cr II, and Fe II absorption lines from this system allow us to infer abundances of [Zn/H] = —1.1, [Cr/H] = —1.2, and [Fe/H] = —1.2, indicating overall metallicity similar to damped systems at z > 2, and that the depletion of Cr and Fe onto dust grains may be even less important than in many of the high-redshift systems of comparable metallicity. Limits previously placed on the 21 cm optical depth in the z = 0.8596 system, together with our new N(H I) measurement, suggest a very high spin temperature for the H I, T_s > 580 K.
机译：我们将哈勃太空望远镜和z_（abs）= 0.8596金属线吸收系统上沿视线到PKS 0454 + 0356的地面数据呈现出来。该系统是中度红移阻尼Lyα系统，具有N（HI）由微弱的物体光谱仪光谱测得＝（5.7±0.3）×10〜（20）cm〜（-2）。我们还提供了地面图像，这些图像可用于识别最有可能引起阻尼系统的星系。根据QSO吸收剂标准，最有可能的候选者是相对发光的（q_0 = 0.5且H_0 = 50 km s〜（-1）Mpc〜（-1）时为M_B〜-19.0），在从QSO视线投影。该系统对Zn II，Cr II和Fe II吸收线的地面测量结果使我们可以推断出[Zn / H] = -1.1，[Cr / H] = -1.2和[Fe / H] = -1.2，表明总体金属性类似于z> 2时的阻尼系统，并且铬和铁在粉尘颗粒上的耗竭甚至不如许多具有相似金属性的高红移系统重要。先前在z = 0.8596系统中21厘米光学深度上的限制以及我们的新N（H I）测量结果表明，H I的自旋温度非常高，T_s> 580 K.

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