论文标题
在电离结束时在星系中检测氮和氧气
Detection of nitrogen and oxygen in a galaxy at the end of reionization
论文作者
论文摘要
我们介绍了[NII] 205 $μ$ M，[OIII] 88 $μ$ M和灰尘排放，并在$ z = 6.0 $，G09.83808的强镜，亚毫米的星系（SMG）中，带有Atacama大型米计/亚毫升/付费阵列（Alimeter/allay（Alma）。 [NII]和[OIII]线排放均以0.8 $“ $ - 分辨率地图”中的$>12σ$检测到。镜头建模表明，灰尘连续量发射的空间分布很好地表征了紧凑的磁盘，有效半径为0.64 $ \ pm $ 0.02 kpc and Infrarreard supper suppers brights a $σ_\ mathrm {ir} =（1.8 \ pm0.3）\ times10^{12} 〜l_ \ odot $ kpc $^{ - 2} $。 G09.83808和其他镜头SMG显示出[NII]线与红外亮度比的趋势下降，而连续性通量密度比在63 $ $ m $ m和158 $μm之间，如局部发光的红外（LIRGS）所见，可以通过趋势来求frodiation rodiation rodiation rodiation在G09.83808中，[NII]/[OIII]的光度比与远红外连续磁通密度比相结合，我们推断出气相金属性已经是$ z \ odot $的$ z \ odot $ yountiation the Endiation the Endiation the Endiation。
We present observations of [NII] 205 $μ$m, [OIII] 88 $μ$m and dust emission in a strongly-lensed, submillimeter galaxy (SMG) at $z=6.0$, G09.83808, with the Atacama Large Millimeter/submillimeter Array (ALMA). Both [NII] and [OIII] line emissions are detected at $>12σ$ in the 0.8$"$-resolution maps. Lens modeling indicates that the spatial distribution of the dust continuum emission is well characterized by a compact disk with an effective radius of 0.64$\pm$0.02 kpc and a high infrared surface brightness of $Σ_\mathrm{IR}=(1.8\pm0.3)\times10^{12}~L_\odot$ kpc$^{-2}$. This result supports that G09.83808 is the progenitors of compact quiescent galaxies at $z\sim4$, where the majority of its stars are expected to be formed through a strong and short burst of star formation. G09.83808 and other lensed SMGs show a decreasing trend of the [NII] line to infrared luminosity ratio with increasing continuum flux density ratio between 63 $μ$m and 158 $μ$m, as seen in local luminous infrared galaxies (LIRGs). The decreasing trend can be reproduced by photoionization models with increasing ionization parameters. Furthermore, by combining the [NII]/[OIII] luminosity ratio with far-infrared continuum flux density ratio in G09.83808, we infer that the gas phase metallicity is already $Z\approx 0.5-0.7~Z_\odot$. G09.83808 is likely one of the earliest galaxies that has been chemically enriched at the end of reionization.
