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arXiv 1601.01682astro-ph.GA
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z=4.77透镜星暴SPT-S J213242-5802的星际介质ALMA视图。9

An ALMA view of the interstellar medium of the z=4.77 lensed starburst SPT-S J213242-5802.9

M. Béthermin, C. De Breuck, B. Gullberg, M. Aravena, M. S. Bothwell, S. C. Chapman, A. H. Gonzalez, T. R. Greve, K. Litke, J. Ma, M. Malkan, D. P. Marrone, E. J… 展开作者

M. Béthermin, C. De Breuck, B. Gullberg, M. Aravena, M. S. Bothwell, S. C. Chapman, A. H. Gonzalez, T. R. Greve, K. Litke, J. Ma, M. Malkan, D. P. Marrone, E. J. Murphy, J. S. Spilker, A. A. Stark, M. Strandet, J. D. Vieira, A. Weiß, N. Welikala

摘要:

我们给出了[NII] 205 $μ$ m和CO(12-11)发射线的ALMA探测,以及强透镜($μ$ =5.7 $\pm$ 0.5)尘埃、恒星形成星系SPT-S J213242-5802.9(以下简称SPT 2132 -58)在z=4.77时[CI] $^3$ P $_1$ - $^3$ P $_0$的初步探测。我们的第6波段观测分别在11.5和8.5PDMATHABMR水平上检测到[NII]和CO(12-11)线。在重新分析现有波段-3数据后,在3.2 $σ$处检测到[CI]线。[CI]的光度意味着气体质量为3.8 $\pm$ 1.2 $\times$ 10 $^{10}$ M $_\odot$,因此耗尽时间尺度为34 $\pm$ 13 Myr,CO光度到气体质量的转换因子$α_{\rm CO}$为1.0 $\pm$ 0.3 M $_\odot$(K km s $^{-1}$ pc $^{2}$)$^{-1}$。SPT 2132 -58是一个极端的星暴,其内在恒星形成率为1100 $\pm$ 200 M $_\odot$ /年。我们发现[CII]/[NII]比为26 $\pm$ 7,这是在z $>$ 4时报告的最高值。这表明SPT 2132 -58拥有一种演化的星际介质(0.5 Z $_\odot$ <Z<1.5 Z $_\odot$),它可能由光解离区域主导。CO(2-1)和CO(5-4)跃迁的CO-远红外比低于本地和高红移样品,而CO(12-11)与这些样品相似,表明存在额外的非常兴奋的成分或活动星系核。

英文摘要:

We present ALMA detections of the [NII] 205$μ$m and CO(12-11) emission lines, and the tentative detection of [CI] $^3$P$_1$ - $^3$P$_0$ for the strongly lensed ($μ$=5.7$\pm$0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z=4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5 $σ$ level, respectively, by our band-6 observations. The [CI] line is detected at 3.2 $σ$ after a re-analysis of existing band-3 data. The [CI] luminosity implies a gas mass of 3.8$\pm$1.2$\times$10$^{10}$ M$_\odot$, and consequently a very short depletion timescale of 34$\pm$13 Myr and a CO-luminosity-to-gas-mass conversion factor $α_{\rm CO}$ of 1.0$\pm$0.3 M$_\odot$ (K km s$^{-1}$ pc$^{2}$)$^{-1}$. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100$\pm$200 M$_\odot$/yr. We find a [CII]/[NII] ratio of 26$\pm$7, which is the highest reported at z$>$4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z$_\odot$<Z<1.5 Z$_\odot$), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO-to-far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an AGN.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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