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arXiv 2302.02365astro-ph.GA
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z=7.2星系[O III ] 88 $μ$ m,[C II ] 158 $μ$ m和尘埃连续辐射的更新测量

Updated measurements of [O III] 88 $μ$m, [C II] 158 $μ$m, and Dust Continuum Emission from a z=7.2 Galaxy

Yi W. Ren, Yoshinobu Fudamoto, Akio K. Inoue, Yuma Sugahara, Tsuyoshi Tokuoka, Yoichi Tamura, Hiroshi Matsuo, Kotaro Kohno, Hideki Umehata, Takuya Hashimoto, Ry… 展开作者

Yi W. Ren, Yoshinobu Fudamoto, Akio K. Inoue, Yuma Sugahara, Tsuyoshi Tokuoka, Yoichi Tamura, Hiroshi Matsuo, Kotaro Kohno, Hideki Umehata, Takuya Hashimoto, Rychard J. Bouwens, Renske Smit, Nobunari Kashikawa, Takashi Okamoto, Takatoshi Shibuya, Ikkoh Shimizu

摘要:

我们提出了更新的测量的[O III] 88 $μ$米,[C II] 158 $μ$米,和尘埃连续辐射从恒星形成星系在$z=7.212$,SXDF-NB 1006 -2,利用阿塔卡马大型毫米/亚毫米阵列(ALMA)档案数据集分析在以前的研究和数据集,以前没有分析过。后续的ALMA观测具有更高的角分辨率和灵敏度,揭示了$0.32-0.85\,\rm{kpc}$尺度上的[O III]发射团簇结构。我们还合并了所有ALMA [O III]([C II])数据集,并将[O III]([C II])检测更新为$5.9σ$($3.6σ-4.5σ$)。未检测到的[C II]与数据从REBELS大型计划意味着不完整的光谱扫描调查使用[C II]检测星系的高恒星形成率(SFR),但边际[C II]发射在高$z$。在90 $μ$ m和160 $μ$ m的尘埃连续体仍然未被检测到,这表明$<3.9\times10^{6}\,M_\odot\,(3σ)$的尘埃含量很少,我们得到了更严格的限制总红外光度。我们更新了[O III]/[C II]光度比,分别为$4.5σ$和$3.6σ$ [C II]探测的$10.2\pm4.7~(6.1\pm3.5$)和$20\pm12~(9.6\pm6.1$),其中括号中的比值针对扩展[C II]发射的表面亮度调光效应进行了校正。我们还发现SXDF-NB 1006 -2与$0<z<9$星系的平均$L_{\rm{[CII]}}-\rm{SFR}$关系之间存在很强的[C II]亏损($0.6-1.3$ dex)。

英文摘要:

We present updated measurements of the [O III] 88 $μ$m, [C II] 158 $μ$m, and dust continuum emission from a star-forming galaxy at $z=7.212$, SXDF-NB1006-2, by utilizing Atacama Large Millimeter/submillimeter Array (ALMA) archival data sets analysed in previous studies and data sets that have not been analysed before. The follow-up ALMA observations with higher angular resolution and sensitivity reveal a clumpy structure of the [O III] emission on a scale of $0.32-0.85\,\rm{kpc}$. We also combined all the ALMA [O III] ([C II]) data sets and updated the [O III] ([C II]) detection to $5.9σ$ ($3.6σ-4.5σ$). The non-detection of [C II] with data from the REBELS large program implies the incompleteness of spectral-scan surveys using [C II] to detect galaxies with high star formation rates (SFRs) but marginal [C II] emission at high-$z$. The dust continuum at 90 $μ$m and 160 $μ$m remains undetected, indicating little dust content of $<3.9\times10^{6}\,M_\odot\,(3σ)$, and we obtained a more stringent constraint on the total infrared luminosity. We updated the [O III]/[C II] luminosity ratios to $10.2\pm4.7~(6.1\pm3.5$) and $20\pm12~(9.6\pm6.1$) for $4.5σ$ and $3.6σ$ [C II] detections, respectively, where the ratios in the parentheses are corrected for the surface brightness dimming effect on the extended [C II] emission. We also found a strong [C II] deficit ($0.6-1.3$ dex) between SXDF-NB1006-2 and the mean $L_{\rm{[CII]}}-\rm{SFR}$ relation of galaxies at $0<z<9$.

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