arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0906.1807astro-ph.COastro-ph.GA
收藏

zCOSMOS调查。z=0.2-1时成团对光度和恒星质量的依赖性

The zCOSMOS Survey. The dependence of clustering on luminosity and stellar mass at z=0.2-1

B. Meneux, L. Guzzo, S. de la Torre, C. Porciani, G. Zamorani, U. Abbas, M. Bolzonella, B. Garilli, A. Iovino, L. Pozzetti, E. Zucca, S. Lilly, O. Le Fevre, J. … 展开作者

B. Meneux, L. Guzzo, S. de la Torre, C. Porciani, G. Zamorani, U. Abbas, M. Bolzonella, B. Garilli, A. Iovino, L. Pozzetti, E. Zucca, S. Lilly, O. Le Fevre, J. -P. Kneib, C. M. Carollo, T. Contini, V. Mainieri, A. Renzini, M. Scodeggio, S. Bardelli, A. Bongiorno, K. Caputi, G. Coppa, O. Cucciati, L. de Ravel, P. Franzetti, P. Kampczyk, C. Knobel, K. Kovac, F. Lamareille, J. -F. Le Borgne, V. Le Brun, C. Maier, R. Pello, Y. Peng, E. Perez Montero, E. Ricciardelli, J. D. Silverman, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, D. Bottini, A. Cappi, A. Cimatti, P. Cassata, M. Fumana, A. M. Koekemoer, A. Leauthaud, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, P. Oesch, R. Scaramella

摘要:

利用第一个zCOSMOS 10 K样本研究了红移z ~ [0.2-1]处星系成团与光度和恒星质量的关系。我们测量了覆盖不同亮度、质量和红移范围的子样本的红移空间关联函数xi(rp,pi)及其投影wp(rp)。我们详细量化的观测选择偏差,我们检查我们的协方差和误差估计技术使用合奏的半分析模拟目录。最后,我们将我们的测量结果与模拟调查的宇宙学模型预测进行了比较。在与其他测量不一致,我们发现一个微弱的依赖星系团的光度在所有的红移箱探索。相反,观察到对恒星质量的轻微依赖。在z~0.7处,wp(rp)在大尺度上显示出强的过剩功率。我们将其解释为大尺度结构主导了调查体积并优先在垂直于视线的方向上延伸。我们没有看到任何显着的演化与红移的集群的振幅明亮和/或大质量的星系。在log(M/M_ \odot)>=10的星系中,zCOSMOS数据在0.5<z<1处测得的成团与模拟巡天的预测仅在一定程度上一致。在大于~2 h^-1 Mpc的尺度上,观测到的聚类幅度仅与~1%的模拟结果一致。因此,如果物质的功率谱是标准归一化的LCDM,并且偏差没有反常的标度依赖性,那么这个结果就表明COSMOS在约10^6 h^-1 Mpc ^3的体积中探测到了一个特别罕见的约2-3 σ的正涨落。这些发现强调了需要对z~1宇宙进行更大规模的调查,以适当地描述这个时代的结构水平。

英文摘要:

We study the dependence of galaxy clustering on luminosity and stellar mass at redshifts z ~ [0.2-1] using the first zCOSMOS 10K sample. We measure the redshift-space correlation functions xi(rp,pi) and its projection wp(rp) for sub-samples covering different luminosity, mass and redshift ranges. We quantify in detail the observational selection biases and we check our covariance and error estimate techniques using ensembles of semi-analytic mock catalogues. We finally compare our measurements to the cosmological model predictions from the mock surveys. At odds with other measurements, we find a weak dependence of galaxy clustering on luminosity in all redshift bins explored. A mild dependence on stellar mass is instead observed. At z~0.7, wp(rp) shows strong excess power on large scales. We interpret this as produced by large-scale structure dominating the survey volume and extending preferentially in direction perpendicular to the line-of-sight. We do not see any significant evolution with redshift of the amplitude of clustering for bright and/or massive galaxies. The clustering measured in the zCOSMOS data at 0.5<z<1 for galaxies with log(M/M_\odot)>=10 is only marginally consistent with predictions from the mock surveys. On scales larger than ~2 h^-1 Mpc, the observed clustering amplitude is compatible only with ~1% of the mocks. Thus, if the power spectrum of matter is LCDM with standard normalization and the bias has no unnatural scale-dependence, this result indicates that COSMOS has picked up a particularly rare, ~2-3 sigma positive fluctuation in a volume of ~10^6 h^-1 Mpc^3. These findings underline the need for larger surveys of the z~1 Universe to appropriately characterize the level of structure at this epoch.

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。

↑