Primordial helium abundance determination using sulphur as metallicity tracer
Primordial helium abundance determination using sulphur as metallicity tracer
复制标题
使用硫作为金属丰度示踪剂测定原始氦丰度
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
F. Rosales
中科院分区：
文献类型：
--
作者：
V. Fern'andez;E. Terlevich;Á. D́ıaz;R. Terlevich;F. Rosales
原始氦丰度$Y_P$是用硫作为金属丰度示踪剂的经典方法计算的（$Y_P$是$Y$到零金属的外推）。计算值Y_{P，S}= 0.244pm ~（0.006），与普朗克实验的估计值以及文献中用氧作金属丰度示踪剂的测定值符合得很好。化学分析包括星云连续体和恒星连续体的sustraction计算简单的恒星人口合成网格。$S^{+2}$的含量是从近红外线$\left[SIII\right]\enda\enda9069\AA，9532\AA $测量的，而$ICF\left（S^{3+}\right）$是基于$Ar^{3+}/Ar^{2+}$分数提出的。最后，用同一样品的氧、氮、硫丰度进行多元线性回归，得到Y_{P-O，N，S}= 0.245pm ~ 0.007 $
The primordial helium abundance $Y_P$ is calculated using sulphur as metallicity tracer in the classical methodology (with $Y_P$ as an extrapolation of $Y$ to zero metals). The calculated value, $Y_{P,\,S}=0.244\pm0.006$, is in good agreement with the estimate from the Planck experiment, as well as, determinations in the literature using oxygen as the metallicity tracer. The chemical analysis includes the sustraction of the nebular continuum and of the stellar continuum computed from simple stellar population synthesis grids. The $S^{+2}$ content is measured from the near infrared $\left[SIII\right]\lambda\lambda9069\AA,9532\AA$ lines, while an $ICF\left(S^{3+}\right)$ is proposed based on the $Ar^{3+}/Ar^{2+}$ fraction. Finally, we apply a multivariable linear regression using simultaneously oxygen, nitrogen and sulphur abundances for the same sample to determine the primordial helium abundance resulting in $Y_{P-O,\,N,\,S}=0.245\pm0.007$
斯隆数字巡天第十次数据发布：来自 SDSS-III 阿帕奇点天文台银河演化实验的首个光谱数据
DOI：
10.1088/0067-0049/211/2/17
发表时间：
2014
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
Ahn C
通讯作者：
Ahn C