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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：我们给出了41个星系（11个单独的星系和30个星系堆）的N/O丰度比、电离参数q（离子）和氧丰度O/H，其中包括Yα发射器和z类似于2的Lyman break星系，并结合斯隆数字巡天（SDSS）和九个绿豌豆星系（GPs）的208529个本地星系，研究从z到0到2的星系演化。与大多数最近的研究相比，我们使用[O（III）]lambda 4363和O（III）]lambda 1665线通过直接T-e方法获得了N/O比、qion和O/H测量值。基于这些可靠的测量，我们发现有z类似于2个星系，其过量的N/O超过了局域星系的N/O-O/H关系，而大多数z类似于2个星系的N/O比几乎与N/O-恒星质量关系中的z类似于0个星系的N/O比相当。我们的星系将N/O比率对数（N/O）的上限平均设置为<=-1.26，这表明N/O比率的演化（如果有的话）小于0.17个指数。为了获得不受N/O-q（离子）-O/H简并影响的可靠测量结果，我们首次证明，在鲍德温-菲利普斯-特里维奇（BPT）图中，类似于两个有偏移量的星系的z显示（1）只有N/O过剩，（2）只有q（离子）过剩，或（3）N/O和q（离子）过剩。我们认为，类似于2的z处的BPT偏移不是由（1）-（3）星系群中的一个单独产生的，而是由（1）-（3）星系群组成的。我们确认，这些（1）-（3）种群也存在于类似于0的z处，例如GPs和SDSS低质量和高SFR星系（LMHSs）。

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