THE LYMAN ALPHA REFERENCE SAMPLE. III. PROPERTIES OF THE NEUTRAL ISM FROM GBT AND VLA OBSERVATIONS

THE LYMAN ALPHA REFERENCE SAMPLE. III. PROPERTIES OF THE NEUTRAL ISM FROM GBT AND VLA OBSERVATIONS
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莱曼阿尔法参考样本 III GBT 和 VLA 观测中的中性 ISM 属性

DOI:
10.1088/0004-637x/794/2/101
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发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Schaerer
Schaerer
中科院分区:
--
文献类型:
--
作者:
Cannon;Östlin;Rivera-Thorsen;Sandberg;Freeland;Herenz;Guaita;Laursen;Mas- Hesse;Melinder;Orlitová;Otí-Floranes;Puschnig;Schaerer

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我们对莱曼α参考样品(LARS)中的14个紫外选择的恒星形成星系进行了新的H i成像和光谱学研究,旨在详细研究Lyα光子的产生、传播和逃逸过程。新的H i光谱,获得100米绿色银行望远镜(GBT),鲁棒地检测H i光谱线在11的14个观察到的LARS星系(虽然两个星系的配置文件可能混淆的GBT光束内的其他来源),三个最高的红移星系没有检测到在我们目前的灵敏度限制。GBT轮廓被用来推导LARS星系的基本H i线特性。我们还提出了新的试点H i光谱线成像的五个LARS星系获得的卡尔G。Jansky甚大阵列(VLA)这张图像定位了H i气体,并提供了每个星系中H i总质量的测量结果。在LARS 03(UGC 8335或阿普238)系统中,VLA观测揭示了一个巨大的潮汐结构,从主要的相互作用系统延伸超过160 kpc,包含> 10 9M的Hi。我们比较了各种H i的性质与来自哈勃太空望远镜测量的全局Lyα量。Lyα逃逸分数的测量与H i质量和显著扰动的H i速度的新的直接测量相结合。我们稳健地检测到的样品揭示了总H i质量和线宽之间的初步相关性,以及关键的Lyα示踪剂。此外,在全球范围内,这些数据支持Lyα传播和周围介质的H i属性之间的复杂耦合。
We present new H i imaging and spectroscopy of the 14 UV-selected star-forming galaxies in the Lyman Alpha Reference Sample (LARS), aimed for a detailed study of the processes governing the production, propagation, and escape of Lyα photons. New H i spectroscopy, obtained with the 100 m Green Bank Telescope (GBT), robustly detects the H i spectral line in 11 of the 14 observed LARS galaxies (although the profiles of two of the galaxies are likely confused by other sources within the GBT beam); the three highest redshift galaxies are not detected at our current sensitivity limits. The GBT profiles are used to derive fundamental H i line properties of the LARS galaxies. We also present new pilot H i spectral line imaging of five of the LARS galaxies obtained with the Karl G. Jansky Very Large Array (VLA). This imaging localizes the H i gas and provides a measurement of the total H i mass in each galaxy. In one system, LARS 03 (UGC 8335 or Arp 238), VLA observations reveal an enormous tidal structure that extends over 160 kpc from the main interacting systems and that contains> 10 9 M☉ of H i. We compare various H i properties with global Lyα quantities derived from Hubble Space Telescope measurements. The measurements of the Lyα escape fraction are coupled with the new direct measurements of H i mass and significantly disturbed H i velocities. Our robustly detected sample reveals tentative correlations between the total H i mass and linewidth, and key Lyα tracers. Further, on global scales, these data support a complex coupling between Lyα propagation and the H i properties of the surrounding medium.
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Lyα 逃离 z 〜 0.03 恒星形成星系:外流的主导作用
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影响因子: --
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发表时间: 2009
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影响因子: --
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