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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Evolution of N/O abundance ratios and ionization parameters from z similar to 0 to 2 investigated by the direct temperature method
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Evolution of N/O abundance ratios and ionization parameters from z similar to 0 to 2 investigated by the direct temperature method

机译：通过直接温度法研究了与Z类似于0至2的N / O丰度比和电离参数的进化

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摘要

We present N/O abundance ratios, ionization parameters q(ion), and oxygen abundances O/H for a total of 41 galaxies (11 individual galaxies and a 30-galaxy stack) including Ly alpha emitters and Lyman break galaxies at z similar to 2, and investigate galaxy evolution from z similar to 0 to 2 in conjunction with 208529 local galaxies from the Sloan Digital Sky Survey (SDSS) and nine green pea galaxies (GPs). In contrast with most of the recent studies, we obtain the N/O ratio, qion, and O/H measurements by direct T-e methods using [O (III)]lambda 4363 and O (III)] lambda 1665 lines. Based on these reliable measurements, we find that there are z similar to 2 galaxies with excesses of N/O falling beyond the N/O-O/H relation of the local galaxies while the majority of the z similar to 2 galaxies have N/O ratios that are nearly comparable with those of z similar to 0 galaxies in the N/O-stellarmass relation. Our galaxies place the upper limit of the N/O ratio log(N/O) <= -1.26 on average, suggesting that the N/O ratio evolves, if at all, by <0.17 dex. Obtaining the reliable measurements free from the N/O-q(ion)-O/H degeneracies, we demonstrate, for the first time, that z similar to 2 galaxies with offsets in the Baldwin-Phillips-Terlevich (BPT) diagram show (1) only an N/O excess, (2) only a q(ion) excess, or (3) both N/O and q(ion) excesses. We argue that the BPT offsets at z similar to 2 are not made by one of the (1)-(3) galaxy populations alone, but a composite of (1)-(3) populations. We confirm that these (1)-( 3) populations also exist at z similar to 0, such as GPs and SDSS low-mass and high-SFR galaxies (LMHSs).
机译：我们呈现N / O丰度率，电离参数Q（离子），以及总共41个星系（11个单独的星系和30个星系堆叠），包括Ly Alpha发射器和Z的Z Z在Z类似于2，并与Z类似于0到2的星系进化与来自Sloan Digital Sky Squal（SDSS）和九豌豆星系（GPS）的208529个局部星系结合。与最近的大部分研究相比，我们通过使用[O（III）] Lambda 4363和O（III）线的直接T-E方法获得N / O比率，QION和O / H测量。基于这些可靠的测量，我们发现有类似于2个星系的星系，不超过当地星系的N / OO / H关系，而大多数Z类似于2个星系的Z种比率与N / O-Stellarmass关系中类似于0个星系的Z几乎相当。我们的星系平均地将N / O比对数（N / O）<= -1.26的上限放置，表明n / o比例在<0.17德克斯的情况下演变。从N / OQ（离子）-O / H堕落的可靠测量，我们首次展示Z类似于2个星系与Baldwin-Phillips-Terlevich（BPT）图表（1）中的偏移量只有N / O过量，（2）只有AQ（离子）过量，或（3）N / O和Q（离子）过量。我们认为Z的BPT偏移类似于2的Z，而不是单独的（1） - （3）的星系种群之一，而是一种（1） - （3）种群的复合材料。我们确认这些（1） - （3）个群体也存在于类似于0的z，例如GPS和SDSS低质量和高SFR星系（LMHS）。

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