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arXiv 0710.0506astro-ph
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赖曼·布雷格·加尔维斯敦(Lyman Break Galvester)

Spitzer View of Lyman Break Galaxies

Georgios E. Magdis, Dimitra Rigopoulou

摘要:

利用IRAC、MIPS和IRS在Spitzer上获得的深中红外观测资料,我们研究了z~3处的Lyman Break Galeries(LBG)的中红外性质,建立了对它们性质的更好理解,并试图对总体进行完整的表征。利用IRAC/MIPS和地面对约1000个LBG进行的深中红外和光学观测,将LBG的光谱能量分布(SED)扩展到中红外。斯皮策的数据首次揭示了人口的中红外特性是不均匀的,从边缘IRAC检测到明亮的静止帧近红外颜色的那些,以及在24 μ MIPS波段检测到的那些,揭示了新发现的红外发光莱曼断裂星系(ILLBG)的人口。为了研究这种多样性,我们研究人口的光度特性,我们使用恒星星族合成模型来探测这些星系的恒星含量。我们发现一小部分LBG具有非常红的颜色和大的估计恒星质量M* > 5x10^10Mo。我们讨论了这些LBG和submm发光星系之间的联系,我们报告的检测静止帧6.2和7.7亩发射功能所产生的多环芳烃(PAH)在斯皮策/IRS光谱的红外发光莱曼break星系在z=3.01。

英文摘要:

Using a combination of deep MID-IR observations obtained by IRAC, MIPS and IRS on board Spitzer we investigate the MID-IR properties of Lyman Break Galaxies (LBGs) at z~3, establish a better understanding of their nature and attempt a complete characterisation of the population. With deep mid-infrared and optical observations of ~1000 LBGs covered by IRAC/MIPS and from the ground respectively, we extend the spectral energy distributions (SEDs) of the LBGs to mid-infrared. Spitzer data reveal for the first time that the mid-infrared properties of the population are inhomogeneous ranging from those with marginal IRAC detections to those with bright rest-frame near-infrared colors and those detected at 24mu MIPS band revealing the newly discovered population of the Infrared Luminous Lyman Break Galaxies (ILLBGs). To investigate this diversity, we examine the photometric properties of the population and we use stellar population synthesis models to probe the stellar content of these galaxies. We find that a fraction of LBGs have very red colors and large estimated stellar masses M* > 5x10^10Mo. We discuss the link between these LBGs and submm-luminous galaxies and we report the detection of rest frame 6.2 and 7.7mu emission features arising from Polycyclic Aromatic Hydrocarbons (PAH) in the Spitzer/IRS spectrum of an infrared-luminous Lyman break galaxy at z=3.01.

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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