GaBoDS: The Garching-Bonn Deep Survey - VI. Probing galaxy bias using weak gravitational lensing

GaBoDS: The Garching-Bonn Deep Survey - VI. Probing galaxy bias using weak gravitational lensing
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GaBoDS:加兴-波恩深度巡天 - VI 使用弱引力透镜探测星系偏差

DOI:
10.1051/0004-6361:20065904
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发表时间:
2007
影响因子:
6.5
通讯作者:
Schirmer
Schirmer
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hetterscheidt;Schirmer

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当代宇宙学中一个有趣的问题是星系的空间分布与暗物质之间的关系,暗物质被认为是宇宙结构形成背后的驱动力。在本文中,我们使用Garching-Bonn Deep Survey (GaBoDS)的数据,在一系列空间尺度上测量了线性随机偏差参数化的这种关系。方法利用弱引力透镜效应来推断巡天视场内的物质密度波动。这个信息被用于星系分布与总物质分布的统计比较。这种比较的结果是通过线性偏差因子、密度波动的比率和密度波动之间的相关因子来表示的。利用r波段星等将整个星系样本划分为三个子样本,并对每个子样本分别进行弱透镜分析。结合相关COMBO-17巡天的光度红移,我们分别估算了这些样品的典型平均红移。结果利用一个具有基准宇宙学的平面模型,我们得到了星系在尺度上的偏差值。在,样品的中位数红移分别大致对应于典型的共移尺度。我们发现了b的尺度依赖性的证据。对范围内的偏置测量值分别求平均值()。因此,在特定的尺度范围内,星系比总物质聚集得更少(反偏差)。至于相关因素,我们认为统计不确定性内没有尺度依赖性;相同范围内的平均值分别为()。这意味着星系和暗物质分布之间可能存在解相关关系。没有发现星系偏差随红移的演化,其上限为:和。
AimsAn interesting question of contemporary cosmology concerns the relation between the spatial distribution of galaxies and dark matter, which is thought to be the driving force behind the structure formation in the Universe. In this paper, we measure this relation, parameterised by the linear stochastic bias parameters, for a range of spatial scales using the data of the Garching-Bonn Deep Survey (GaBoDS).MethodsThe weak gravitational lensing effect is used to infer matter density fluctuations within the field-of-view of the survey fields. This information is employed for a statistical comparison of the galaxy distribution to the total matter distribution. The result of this comparison is expressed by means of the linear bias factorb, the ratio of density fluctuations, and the correlation factorrbetween density fluctuations. The total galaxy sample is divided into three sub-samples usingR-band magnitudes and the weak lensing analysis is applied separately for each sub-sample. Together with the photometric redshifts from the related COMBO-17 survey we estimate the typical mean redshifts of these samples with, respectively.ResultsUsing a flatmodel withas fiducial cosmology, we obtain values for the galaxy bias on scales between. At, the median redshifts of the samples correspond roughly to a typical comoving scale ofwith, respectively. We find evidence for a scale-dependence ofb. Averaging the measurements of the bias over the rangeyields(), respectively. Galaxies are thus less clustered than the total matter on that particular range of scales (anti-biased). As for the correlation factorrwe see no scale-dependence within the statistical uncertainties; the average over the same range is(), respectively. This implies a possible decorrelation between galaxy and dark matter distribution. An evolution of galaxy bias with redshift is not found, the upper limits are:and.
从星系红移巡天测量非线性偏置函数
DOI: 10.1086/309331
发表时间: 2000
期刊: The Astrophysical Journal
影响因子: --
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Y. Sigad;E. Branchini;A. Dekel
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发表时间: 2005-02
影响因子: 6.5
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影响因子: 2.3
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通讯作者: I. Kayo;Y. Suto;R. Nichol;Jun Pan;I. Szapudi;A. Connolly;J. Gardner;B. Jain;G. Kulkarni;T. Matsubara;R. Sheth;A. Szalay;J. Brinkmann