Hubble Space Telescope Observations of the Gravitationally Lensed Cloverleaf Broad Absorption Line QSO H1413+1143: Spectroscopy of the Lyα Forest and Metal-Line Systems
Hubble Space Telescope Observations of the Gravitationally Lensed Cloverleaf Broad Absorption Line QSO H1413+1143: Spectroscopy of the Lyα Forest and Metal-Line Systems
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哈勃太空望远镜对引力透镜三叶草宽吸收线 QSO H1413+1143 的观测：Lyα 森林和金属线系统的光谱学
DOI：
10.1086/305372
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
O. Lupie
中科院分区：
文献类型：
--
作者：
E. Monier;D. Turnshek;O. Lupie
利用HST-FOS谱，沿沿着四条视线观测了“三叶草”引力透镜H1413+1143（zem = 2.54，mv = 17）的Lyα森林和金属线吸收体。观测探测Lyα森林系统的尺度可达4 h-1 kpc（H 0 = 100 h km s-1 Mpc-1，q 0 = 0.5），探测金属线系统的尺度可达6 h-1 kpc。Lyα森林线的等效宽度一般沿四条不同的视线沿着有很好的相关性，并且与穿过相同吸收体的视线一致。重元素系统清楚地显示了差异的证据。在zabs = 2.0969的系统中可以看到一个显著的差异，其中Lyα线在组分B中的柱密度接近log N（H I）= 19.7，但在其他三个组分中的任何一个中不超过log N（H I）= 18.4。模拟结果表明，假设透镜红移z透镜= 1.55，在90%置信水平下，造成这种情况的圆形吸收体半径≤10 h-1 kpc。zabs = 1.6595系统包含一条可能的阻尼Lyα线，并显示出旋转的证据。在zabs = 1.4377的系统表现出非常显着的Fe II的吸收，只有两个组件的观测灵敏度的水平。考察吸收线等效宽度在各组成光谱之间的相关性，可以提供关于类星体的所有四条视线是否都通过同一吸收体的信息，从而限制吸收体的大小和形状。朝向H1413+1143的四条视线为这类研究提供了独特的几何形状。
The intervening Lyα forest and metal-line absorbers toward the "Cloverleaf" gravitational lens H1413+1143 (zem = 2.54, mv ≈ 17) are examined along the four individual sight lines using HST-FOS spectra. The observations probe the Lyα forest systems on size scales of up to 4 h-1 kpc (H0 = 100 h km s-1 Mpc-1, q0 = 0.5) and metal-line systems on scales up to 6 h-1 kpc. The equivalent widths of Lyα forest lines in general are well correlated along the four different lines of sight and are consistent with the sight lines piercing the same absorbers. The heavy-element systems clearly show evidence for differences. One striking difference is seen in a system at zabs = 2.0969 in which the Lyα line possesses a column density approaching log N(H I) = 19.7 in component B but not exceeding log N(H I) = 18.4 in any of the other three components. Simulations show that a circular absorber responsible for such a scenario has a radius of ≤10 h-1 kpc with a 90% confidence level, assuming a lens redshift of zlens = 1.55. The zabs = 1.6595 system contains a probable damped Lyα line and shows evidence for rotation. A system at zabs = 1.4377 exhibits very significant Fe II absorption in only two of the components at the level of sensitivity of the observations. Examination of how the absorption-line equivalent widths are correlated between the component spectra can provide information about whether all four lines of sight to the QSO are passing through the same absorbers, placing limits on absorber sizes and shapes. The four sight lines toward H1413+1143 provide a unique geometry for this type of study.