arXiv 0712.00332007-12-01astro-ph

红移z~1的红外发光星系的几Mpc尺度环境

The Environment on few Mpc scales of Infrared Luminous Galaxies at Redshifts z~1

D. Marcillac, G. H. Rieke, C. Papovich, C. N. A. Willmer, B. J. Weiner, A. L. Coil, M. C. Cooper, B. F. Gerke, J. Woo, J. A. Newman, A. Georgakakis, E. S. Laird… 展开作者

D. Marcillac, G. H. Rieke, C. Papovich, C. N. A. Willmer, B. J. Weiner, A. L. Coil, M. C. Cooper, B. F. Gerke, J. Woo, J. A. Newman, A. Georgakakis, E. S. Laird, K. Nandra, G. G. Fazio, J. -S. Huang, D. C. Koo

备注：: 47 pages, 11 figures, accepted for publication in ApJ
DOI：: 10.1086/527031

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摘要：

我们研究了红外发光星系（L $_{IR}$ [8-1000 $μ$ m $] >10^{11}$ L $_{\sun}$）的环境。我们专注于红移范围为0.7 $\leq$ z $\leq$ 1，这些星系占主导地位的恒星形成活动，并在星系演化中发挥重要作用。我们采用MIPS 24 $μ$ m数据来识别扩展格罗斯带（EGS）中的红外星系。我们使用局部密度指示器来探测几个Mpc尺度和群成员目录上的环境，这两个都利用了DEEP 2光谱红移目录，以量化这些星系的环境。我们发现LIRGs和ULIRGs的局部环境是介于蓝色和红色星系之间的。LIRGs和ULIRGs避免了密度不足的环境，并居住在平均密度比其他类似红移的DEEP 2星系更高的局部环境中。然而，当非红外DEEP 2星系的比较样本被限制为具有与红外-星系相同的恒星质量、颜色或光度范围时，在环境上不再有任何显著的差异;红外-星系遵循在z $\sim$ 1处观察到的颜色-环境和光度-环境关系的相同趋势。我们还发现，大约30%的LIRG和ULIRG属于组，与6 $\times10^{12}$ M $_{\odot}$ h $^{-1}$的最小暗物质晕。群成员构成了负责红外恒星形成率密度和z $\sim$ 1处共动能量密度的源的20%。

英文摘要：

We investigate the environment of infrared luminous galaxies (L$_{IR}$[8-1000 $μ$m$] >10^{11}$L$_{\sun}$). We focus on the redshift range 0.7 $\leq$ z $\leq$ 1, where these galaxies dominate the star formation activity and play a significant role in galaxy evolution. We employ MIPS 24$μ$m data to identify infrared galaxies in the Extended Groth Strip (EGS). We use a local density indicator to probe the environment on few Mpc scales and a group member catalog, both of which make use of the DEEP2 spectroscopic redshift catalog, to quantify the environment of these galaxies. We find that the local environment of LIRGs and ULIRGs is intermediate between that of blue and red galaxies. LIRGs and ULIRGs avoid underdense environments and inhabit local environments that are more dense on average than those of other DEEP2 galaxies at similar redshifts. However, when the comparison sample of the non-IR DEEP2 galaxies is restricted to have the same range of stellar mass, color, or luminosity as the IR--galaxies, there is no longer any significant difference in environment; the IR-galaxies follow the same trends in the color-environment and luminosity-environment relations observed at z$\sim$1. We also find that about 30% of the LIRGs and ULIRGs belong to groups, associated with a minimum dark matter halo of 6$\times10^{12}$M$_{\odot}$h$^{-1}$. The group members constitute 20 % of the sources responsible for the IR star formation rate density and comoving energy density at z$\sim$1.

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