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首次探测到高红移的[ OIII ] 88微米谱线：描述极亮系统中的星暴和窄谱线区域

First Detection of the [OIII] 88 micron Line at High Redshifts: Characterizing the Starburst and Narrow Line Regions in Extreme Luminosity Systems

C. Ferkinhoff, S. Hailey-Dunsheath, T. Nikola, S. C. Parshley, G. J. Stacey, D. J. Benford, J. G. Staguhn

备注：
Accepted for publication in ApJ Letters, 17 pages, 2 figures
发表信息：
Astrophysical Journal Letters 714 (2010) L147-L151
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摘要：

我们首次探测到了来自早期宇宙星系的88微米[OIII]线，探测到了来自透镜活动星系核/星暴复合系统APM 08279+5255（z = 3.911）和SMM J 02399 -0136（z = 2.8076）的线。这条线在两个系统中都异常明亮，视光度（透镜）约为10^11 L_solar。对于APM 08279，[OIII]线通量可以在恒星形成范例中建模，恒星辐射场主要由有效温度Teff > 36，000 K的恒星组成，类似于在M82中发现的星暴。该模型暗示，该系统的远红外总光度的约35%是由星暴产生的，其余的则是由活动星系核加热的尘埃产生的。如果气体密度在1000 cm-3左右，在活动星系核的窄线区也能产生88微米的谱线。对于SMM J 02399，[OIII]线可能来自HII区域，这些区域是由热的（Teff > 40，000 K）年轻恒星在大质量星暴中形成的，该星暴主导了系统的远红外光度。目前的工作表明，[OIII]线的实用性，在早期宇宙中的星系内的星暴和活动星系核的特征。这是第一次探测到这个天体物理学上重要的线，来自红移超过0.05的星系。

英文摘要：

We have made the first detections of the 88 micron [OIII] line from galaxies in the early Universe, detecting the line from the lensed AGN/starburst composite systems APM 08279+5255 at z = 3.911 and SMM J02399-0136 at z = 2.8076. The line is exceptionally bright from both systems, with apparent (lensed) luminosities ~10^11 L_solar. For APM 08279, the [OIII] line flux can be modeled in a star formation paradigm, with the stellar radiation field dominated by stars with effective temperatures, Teff >36,000 K, similar to the starburst found in M82. The model implies ~35% of the total far-IR luminosity of the system is generated by the starburst, with the remainder arising from dust heated by the AGN. The 88 micron line can also be generated in the narrow line region of the AGN if gas densities are around a few 1000 cm-3. For SMM J02399 the [OIII] line likely arises from HII regions formed by hot (Teff >40,000 K) young stars in a massive starburst that dominates the far-IR luminosity of the system. The present work demonstrates the utility of the [OIII] line for characterizing starbursts and AGN within galaxies in the early Universe. These are the first detections of this astrophysically important line from galaxies beyond a redshift of 0.05.

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