Spitzer Observations of z ~ 3 Lyman Break Galaxies: Stellar Masses and Mid-Infrared Properties
Spitzer Observations of z ~ 3 Lyman Break Galaxies: Stellar Masses and Mid-Infrared Properties
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DOI：
10.1086/505784
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发表时间：
2006-05
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通讯作者：
D. Rigopoulou;J. Huang;C. Papovich;M. Ashby;P. Barmby;C. Shu;K. Bundy;E. Egami;G. Magdis;Howard A. Smith;S. Willner;Gillian Wilson;Giovanni G. Fazio
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作者：
D. Rigopoulou;J. Huang;C. Papovich;M. Ashby;P. Barmby;C. Shu;K. Bundy;E. Egami;G. Magdis;Howard A. Smith;S. Willner;Gillian Wilson;Giovanni G. Fazio
利用Spitzer上的IRAC和MIPS对扩展的Groth带的深中红外和光学观测，描述了Lyman Break星系(LBGS)在z~3的光谱能量分布(SED)。我们的重点是在所有四个IRAC波段都有探测的LBGS，特别是26个有IRAC8μm带(静止框架K带)探测的星系。我们使用恒星人口合成模型，并探索这些星系的恒星含量。基于最佳拟合的连续恒星形成模型，我们得到了这些LBG的恒星质量估计值。和以前的研究一样，我们发现一小部分LBG具有非常红的颜色和很大的估计恒星质量(M*>；5×1010M☉)；目前的斯皮策数据使我们第一次能够详细研究这些巨大的LBG。我们讨论了这些LBG和亚毫米发光星系之间的联系，我们发现这些大质量LBG在高红移时的数密度比目前星系演化的半解析模型所预测的要高。
We describe the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z ~ 3, using deep mid-infrared and optical observations of the extended Groth strip, obtained with IRAC and MIPS on board Spitzer and from the ground, respectively. We focus on LBGs with detections at all four IRAC bands, in particular the 26 galaxies with IRAC 8 μm band (rest-frame K-band) detections. We use stellar population-synthesis models and probe the stellar content of these galaxies. Based on best-fit continuous star formation models, we derive estimates of the stellar mass for these LBGs. As in previous studies, we find that a fraction of LBGs have very red colors and large estimated stellar masses (M* > 5 × 1010 M☉); the current Spitzer data allow us, for the first time, to study these massive LBGs in detail. We discuss the link between these LBGs and submillimeter-luminous galaxies, and we find that the number density of these massive LBGs at high redshift is higher than predicted by current semianalytic models of galaxy evolution.