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arXiv 1912.07652astro-ph.GA
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首次探测到来自红移6尘埃星系的[ OI ] 63 μ m辐射

First detection of the [OI] 63-um emission from a redshift 6 dusty galaxy

M. Rybak, J. A. Zavala, J. A. Hodge, C. M. Casey, P. van der Werf

摘要:

我们报告了在z=6.027的引力透镜尘埃恒星形成星系(DSFG)G09.83808中使用APEX SEPIA 660接收器的[OI] 63-um线的地面探测,第一次明确地探测到超过红移3的[OI]63线,也是第一次从地面获得。[OI]63线在22 $\pm$ 5 μ km s $^{-1}$处被稳健地探测到,对应于$(5.4\pm1.3)\times10^{9}$ L $_\odot$的固有(去透镜)光度。在[OI]63/[CII]光度比为4的情况下,[OI]63线是该星系中性气体的主要冷却剂,与模型预测一致。高[OI]63亮度补偿了明显的[CII]不足([CII]/FIR $\simeq4\times10^{-4}$)。使用光子占主导地位的区域模型,我们推导出源平均气体密度$n=10^{4.0}$ cm $^{-3}$,和远紫外场强度$G=10^4 G_0$,相当于z=2-4 DSFG人口。如果G09.83808代表一个典型的高红移DSFG,那么来自z=6的非透镜DSFG的[OI]63线应该可以在ALMA波段9的观测中常规检测到,$\sim$ 15分钟的源上,打开一个新的窗口来研究最早的DSFG的属性。

英文摘要:

We report a ground-based detection of the [OI] 63-um line in a z=6.027 gravitationally lensed dusty star-forming galaxy (DSFG) G09.83808 using the APEX SEPIA 660 receiver, the first unambiguous detection of the [OI]63 line beyond redshift 3, and the first obtained from the ground. The [OI]63 line is robustly detected at 22$\pm$5 Jy km s$^{-1}$, corresponding to an intrinsic (de-lensed) luminosity of $(5.4\pm1.3)\times10^{9}$ L$_\odot$. With the [OI]63/[CII] luminosity ratio of 4, the [OI]63 line is the main coolant of the neutral gas in this galaxy, in agreement with model predictions. The high [OI]63 luminosity compensates for the pronounced [CII] deficit ([CII]/FIR$\simeq4\times10^{-4}$). Using photon-dominated region models, we derive a source-averaged gas density $n=10^{4.0}$ cm$^{-3}$, and far-UV field strength $G=10^4 G_0$, comparable to the z=2-4 DSFG population. If G09.83808 represents a typical high-redshift DSFG, the [OI]63 line from z=6 non-lensed DSFGs should be routinely detectable in ALMA Band 9 observations with $\sim$15 min on-source, opening a new window to study the properties of the earliest DSFGs.

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