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arXiv 1105.4093astro-ph.CO
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PEP巡天：GOODS南部z~2处红外选择星系的成团和结构形成

The PEP survey: clustering of infrared-selected galaxies and structure formation at z~2 in the GOODS South

M. Magliocchetti, P. Santini, G. Rodighiero, A. Grazian, H. Aussel, B. Altieri, P. Andreani, S. Berta, J. Cepa, H. Castañeda, A. Cimatti, E. Daddi, D. Elbaz, R.… 展开作者

M. Magliocchetti, P. Santini, G. Rodighiero, A. Grazian, H. Aussel, B. Altieri, P. Andreani, S. Berta, J. Cepa, H. Castañeda, A. Cimatti, E. Daddi, D. Elbaz, R. Genzel, C. Gruppioni, D. Lutz, B. Magnelli, R. Maiolino, P. Popesso, A. Poglitsch, F. Pozzi, M. Sanchez-Portal, N. M. Förster Schreiber, E. Sturm, L. Tacconi, I. Valtchanov

备注：
14 pages, 8 figures, MNRAS accepted
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摘要：

本文提出了第一个直接估计的三维聚类特性的远红外源z~3。这要归功于使用赫歇尔卫星上的PACS仪器对货物南部区域进行的PACS进化探测（PEP）调查。本文分析了在100 μ m和160 μ m处的两点关联函数，其关联长度分别为r_0~6.3 Mpc和r_0~6.7 Mpc，对应于暗物质晕质量M>~10^{12.4} M_sun。相反，z~2处的对象似乎更强地聚集，在两个所考虑的PACS通道中具有r_0~19 Mpc和r_0~17 Mpc。z~1和z~2之间的相关长度的这种急剧增加与一个宽的M>~10^{14} M_sun的平行结构的存在有关，该结构包括在z~2处检测到的50%以上的源。对这些来源的性质的调查表明，在那些居住在过密环境中的星系中，在相同的红移范围内发现更多的孤立星系，可能会促进恒星形成活动。最后，我们还介绍了z~1和z~2之间恒星形成星系中亮物质和暗物质之间关系的演化结果。我们发现，在z~1和z~2之间的<M*>星系中恒星质量的平均增长比暗物质晕中的恒星质量的平均增长低约10倍（<M*>[z~1]/<M*>[z~2] ~ 0.4 vs M_{halo} [z~1]/ M_{halo} [z~2] ~ 0.04）。我们的研究结果与缩小的演化图景一致，即z~2的大质量星系比z~1的大质量星系更活跃地形成恒星，同时以发光物质的形式包含更低比例的质量。

英文摘要：

ABRIDGED-This paper presents the first direct estimate of the 3D clustering properties of far-infrared sources up to z~3. This has been possible thanks to the Pacs Evolutionary Probe (PEP) survey of the GOODS South field performed with the PACS instrument onboard the Herschel Satellite. An analysis of the two-point correlation function over the whole redshift range spanned by the data reports for the correlation length, r_0~6.3 Mpc and r_0~6.7 Mpc, respectively at 100um and 160um, corresponding to dark matter halo masses M>~10^{12.4} M_sun. Objects at z~2 instead seem to be more strongly clustered, with r_0~19 Mpc and r_0~17 Mpc in the two considered PACS channels. This dramatic increase of the correlation length between z~1 and z~2 is connected with the presence of a wide, M>~10^{14} M_sun, filamentary structure which includes more than 50% of the sources detected at z~2. An investigation of the properties of such sources indicates the possibility for boosted star-forming activity in those which reside within the overdense environment with respect of more isolated galaxies found in the same redshift range. Lastly, we also present our results on the evolution of the relationship between luminous and dark matter in star-forming galaxies between z~1 and z~2. We find that the increase of (average) stellar mass in galaxies <M*> between z~1 and z~2 is about a factor 10 lower than that of the dark matter haloes hosting such objects (<M*>[z~1]/<M*>[z~2] ~ 0.4 vs M_{halo}[z~1]/M_{halo}[z~2] ~ 0.04). Our findings agree with the evolutionary picture of downsizing whereby massive galaxies at z~2 were more actively forming stars than their z~1 counterparts, while at the same time contained a lower fraction of their mass in the form of luminous matter.

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