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arXiv 1105.0646astro-ph.CO
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HerMES:在带有Herschel/SPIRE的GOODS-N中,在0.7 < z < 2.0处单独检测到莱曼断裂Galerkin

HerMES: Lyman Break Galaxies individually detected at 0.7 < z < 2.0 in GOODS-N with Herschel/SPIRE

D. Burgarella, S. Heinis, G. Magdis, R. Auld, A. Blain, J. Bock, D. Brisbin, V. Buat, P. Chanial, D. L. Clements, A. Cooray, S. Eales, A. Franceschini, E. Giova… 展开作者

D. Burgarella, S. Heinis, G. Magdis, R. Auld, A. Blain, J. Bock, D. Brisbin, V. Buat, P. Chanial, D. L. Clements, A. Cooray, S. Eales, A. Franceschini, E. Giovannoli, J. Glenn, E. A. Gonzalez Solares, M. Griffin, H. S. Hwang, O. Ilbert, L. Marchetti, A. M. J. Mortier, S. J. Oliver, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Perez-Fournon, M. Pohlen, J. I. Rawlings, G. Raymond, D. Rigopoulou, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, D. Scott, N. Seymour, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, J. D. Vieira, M. Viero, L. Vigroux, L. Wang, G. Wright

摘要:

作为Herschel多层河外巡天的一部分,我们研究了大天文台起源深巡天北场4800多个Lyman Break Galeries(LBG)样本的静止标架远红外(FIR)特性。大多数LBG都没有被单独检测到,但我们确实检测到了0.7 < z < 1.6的12个对象和z ~ 2.0的一个对象的子样本。由Herschel SPIRE探测到的天体具有比其他天体更红的NUV-U和U-R颜色,而未探测到的天体具有与z > 2.5时的平均LBG一致的颜色。使用CIGALE代码来估计物理参数,研究了在静止帧FIR中检测到的对象的UV到FIR光谱能量分布。我们发现SPIRE探测到的LBG是高质量的亮红外星系。在A_FUV与Log L_FUV图中,LBG似乎位于一个三角形区域内,底部的A_FUV=0,以及从图的右下角到左上角最大质量星系的时间演化的对角线。该上包络可以用作作为L_FUV的函数的UV尘埃衰减的上限。这个区域的极限可以用一个封闭的盒子模型很好地解释,在这个模型中,星系的化学演化产生了金属,这反过来又导致了星系老化时更高的尘埃衰减。

英文摘要:

As part of the Herschel Multi-tiered Extragalactic Survey we have investigated the rest-frame far-infrared (FIR) properties of a sample of more than 4800 Lyman Break Galaxies (LBGs) in the Great Observatories Origins Deep Survey North field. Most LBGs are not detected individually, but we do detect a sub-sample of 12 objects at 0.7 < z < 1.6 and one object at z ~ 2.0. The ones detected by Herschel SPIRE have redder observed NUV-U and U-R colors than the others, while the undetected ones have colors consistent with average LBGs at z > 2.5. The UV-to-FIR spectral energy distributions of the objects detected in the rest-frame FIR are investigated using the code CIGALE to estimate physical parameters. We find that LBGs detected by SPIRE are high mass, luminous infrared galaxies. It appears that LBGs are located in a triangle-shaped region in the A_FUV vs. Log L_FUV diagram limited by A_FUV=0 at the bottom and by a diagonal following the temporal evolution of the most massive galaxies from the bottom-right to the top-left of the diagram. This upper envelop can be used as upper limits for the UV dust attenuation as a function of L_FUV}. The limits of this region are well explained using a closed-box model, where the chemical evolution of galaxies produces metals, which in turn lead to higher dust attenuation when the galaxies age.

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