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
中科院分区:
文献类型:
--
作者:
Hetterscheidt;Schirmer
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.
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DOI:
10.1086/309331
发表时间:
2000
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Y. Sigad;E. Branchini;A. Dekel
通讯作者:
A. Dekel
DOI:
10.1086/312068
发表时间:
1998
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
Max Tegmark;B. Bromley
通讯作者:
B. Bromley
DOI:
10.1086/376517
发表时间:
2002-12
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Berlind;D. Weinberg;A. Benson;C. Baugh;S. Cole;R. Dav'e;C. Frenk;A. Jenkins;N. Katz;C. Lacey
通讯作者:
A. Berlind;D. Weinberg;A. Benson;C. Baugh;S. Cole;R. Dav'e;C. Frenk;A. Jenkins;N. Katz;C. Lacey
影响因子:
6.5
作者:
P. Watts
通讯作者:
P. Watts
影响因子:
2.3
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
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