METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble program. II. Variations of interstellar depletions and dust-to-gas ratio within the LMC.

J. Roman-Duval, E. Jenkins, K. Tchernyshyov, B. Williams, C. Clark, K. Gordon, M. Meixner, L. Hagen, J. Peek, K. Sandstrom, J. Werk, Petia Yanchulova Merica-Jones
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引用次数: 1

Abstract

A key component of the baryon cycle in galaxies is the depletion of metals from the gas to the dust phase in the neutral ISM. The METAL (Metal Evolution, Transport and Abundance in the Large Magellanic Cloud) program on the Hubble Space Telescope acquired UV spectra toward 32 sightlines in the half-solar metallicity LMC, from which we derive interstellar depletions (gas-phase fractions) of Mg, Si, Fe, Ni, S, Zn, Cr, and Cu. The depletions of different elements are tightly correlated, indicating a common origin. Hydrogen column density is the main driver for depletion variations. Correlations are weaker with volume density, probed by CI fine structure lines, and distance to the LMC center. The latter correlation results from an East-West variation of the gas-phase metallicity. Gas in the East, compressed side of the LMC encompassing 30 Doradus and the Southeast HI over-density is enriched by up to +0.3dex, while gas in the West side is metal-deficient by up to -0.5dex. Within the parameter space probed by METAL, no correlation with molecular fraction or radiation field intensity are found. We confirm the factor 3-4 increase in dust-to-metal and dust-to-gas ratios between the diffuse (logN(H)~20 cm-2) and molecular (logN(H)~22 cm-2) ISM observed from far-infrared, 21 cm, and CO observations. The variations of dust-to-metal and dust-to-gas ratios with column density have important implications for the sub-grid physics of chemical evolution, gas and dust mass estimates throughout cosmic times, and for the chemical enrichment of the Universe measured via spectroscopy of damped Lyman-alpha systems.
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金属:大麦哲伦星云中的金属演化、运输和丰度。2LMC内星际消耗和尘气比的变化。
星系中重子循环的一个关键组成部分是中性星系中金属从气体到尘埃阶段的消耗。哈勃太空望远镜上的金属(大麦哲伦云中的金属演化、输运和丰度)项目获得了半太阳金属丰度LMC中32条视点的紫外光谱,从中我们得出了Mg、Si、Fe、Ni、S、Zn、Cr和Cu的星际消耗(气相分数)。不同元素的消耗是紧密相关的,表明有一个共同的起源。氢柱密度是耗竭变化的主要驱动因素。与CI精细结构线探测的体积密度和到LMC中心的距离的相关性较弱。后一种相关性是由气相金属丰度的东西变化引起的。在LMC的东部,包括30 Doradus和东南部HI过密度的压缩侧,天然气富集高达+0.3指数,而西部天然气缺乏高达-0.5指数。在METAL探测的参数空间内,没有发现与分子分数或辐射场强的相关性。我们证实了从远红外、21 cm和CO观测中观测到的漫射(logN(H)~20 cm-2)和分子(logN(H)~22 cm-2) ISM之间的粉尘与金属和粉尘与气体之比增加了3-4倍。尘-金属比和尘-气比随柱密度的变化对化学演化的亚网格物理、整个宇宙时期的气体和尘埃质量估计以及通过阻尼Lyman-alpha系统的光谱测量宇宙的化学富集具有重要意义。
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