Searching for galaxy clusters using the aperture mass statistics in 50 VLT fields
Searching for galaxy clusters using the aperture mass statistics in 50 VLT fields
复制标题
使用 50 个 VLT 场中的孔径质量统计数据搜索星系团
DOI:
10.1051/0004-6361:20053339
复制
发表时间:
2005
影响因子:
6.5
通讯作者:
Hetterscheidt
中科院分区:
文献类型:
--
作者:
Hetterscheidt
Application of the aperture mass (Map-) statistics provides a weak lensing method for the detection of cluster-sized dark matter halos. We present a new aperture filter function and maximise the effectiveness of theMap-statistics to detect cluster-sized halos using analytical models. We then use weak lensing mock catalogues generated from ray-tracing throughN-body simulations, to analyse the effect of image treatment on the expected number density of halos. Using theMap-statistics, the aperture radius is typically several arcminutes, hence the aperture often lies partly outside a data field, consequently the signal-to-noise ratio of a halo detection decreases. We study these border effects analytically and by using mock catalogues. We find that the expected number density of halos decreases by a factor of two if the size of a field is comparable to the diameter of the aperture used. We finally report on the results of a weak lensing cluster search applying theMap-statistics to 50 randomly selected fields which were observed with FORS1 at the VLT. Altogether the 50 VLT fields cover an area of 0.64 square degrees. TheI-band images were taken under excellent seeing conditions (average seeing ) which results in a high number density of galaxies used for the weak lensing analysis (). In five of the VLT fields, we detect a significantMap-signal which coincides with an overdensity of the light distribution. These detections are thus excellent candidates for shear-selected clusters.
登录
查看更多内容
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
D. Wittman;V. Margoniner;J. Tyson;J. Cohen;A. Becker;I. Dell’Antonio
通讯作者:
I. Dell’Antonio
DOI:
10.1111/j.1365-2966.2004.07691.x
发表时间:
2003-10
影响因子:
4.8
作者:
T. Hamana;M. Takada;N. Yoshida
通讯作者:
T. Hamana;M. Takada;N. Yoshida
DOI:
--
发表时间:
2004
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
作者:
J. Dietrich;D. Clowe;P. Schneider;J. Kerp;E. R. Iaef;U. Bonn;R. Institut;K. Institute;U. Groningen
通讯作者:
U. Groningen
DOI:
10.1046/j.1365-8711.2001.04029.x
发表时间:
2001-02-21
影响因子:
4.8
作者:
Jenkins, A;Frenk, CS;Yoshida, N
通讯作者:
Yoshida, N
DOI:
10.1086/321441
发表时间:
2000
期刊:
The Astrophysical Journal
影响因子:
--
作者:
G. Wilson;N. Kaiser;G. Luppino;L. Cowie
通讯作者:
L. Cowie