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首页> 外文期刊>The Astrophysical Journal. Letters >Warm-hot gas in groups and galaxies toward h2356-309
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Warm-hot gas in groups and galaxies toward h2356-309

机译：朝着h2356-309的群和星系中的热气

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摘要

We present a detailed analysis of the galaxy and group distributions around three reported X-ray absorption line systems in the spectrum of the quasar H2356-309. Previous studies associated these absorbers with known large-scale galaxy structures (i.e., walls and filaments) along the line of sight. Such absorption lines typically trace 10~5-10~7 K gas, and may be evidence of the elusive warm-hot intergalactic medium (WHIM) thought to harbor the bulk of the low-redshift "missing baryons"; alternatively, they may be linked to individual galaxies or groups in the filaments. Here we combine existing galaxy survey data with new, multi-object Magellan spectroscopy to investigate the detailed galaxy distribution near each absorber. All of these three absorption systems are within the projected virial radii of nearby galaxies and/or groups, and could therefore arise in these virialized structures rather than (or in addition to) the WHIM. However, we find no additional galaxies near a fourth "void" absorber recently found in the spectrum, suggesting that this system may indeed trace gas unassociated with any individual halo. Though the number of known systems is still small, spatial coincidences suggest that some X-ray absorbers lie in galaxy and/or group environments, though others could still trace the large-scale filamentary WHIM gas predicted by simulations.
机译：我们对类星体H2356-309光谱中三个已报告的X射线吸收线系统周围的星系和族群分布进行了详细分析。先前的研究将这些吸收器与沿视线的已知大规模星系结构（即墙壁和细丝）相关联。这种吸收线通常跟踪10〜5-10〜7 K气体，并且可能是难以捉摸的温热星系间介质（WHIM）的证据，该介质被认为藏有大量的低红移“失重子”。或者，它们可以链接到细丝中的单个星系或组。在这里，我们将现有的星系调查数据与新的多对象麦哲伦光谱相结合，以研究每个吸收体附近的详细星系分布。所有这三个吸收系统都在附近星系和/或星系的预计病毒半径内，因此可能出现在这些病毒化结构中，而不是（或除了）WHIM。但是，我们在光谱中最近发现的第四个“空”吸收器附近没有发现其他星系，这表明该系统确实可以追踪与任何单个晕圈无关的气体。尽管已知系统的数量仍然很少，但空间巧合表明某些X射线吸收剂位于星系和/或群环境中，尽管其他一些仍可以追踪模拟预测的大规模丝状WHIM气体。

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