摘要
在不久的将来,若干基于SZ效应的巡天计划即将观测到大量的星系团．分别采 用星系团暗物质的球模型和椭球模型,给出了可观测SZ星系团数目的理论预测,并讨论 了形状对星系团数目不确定性的影响．在计算中,利用星系团维里平衡的条件,通过巡天 观测的流量下限来确定可观测星系团质量下限,进一步由质量函数给出星系团数目预测． 计算结果表明:若通过SZ巡天观测来限定宇宙学参数,形状引起的系统不确定性要予以 考虑．
Several galaxy cluster surveys based on the Sunyaev-Zel＇dovich effect （SZE） will detect numerous clusters in the near future. Adopting the triaxial model and the spherial model respectively for dark matter halos, we give a prediction for unresolved SZE cluster counts and discuss the number uncertainty induced by cluster shape variation. The cluster mass threshold at any distance is determined by the flux limit of a cluster survey when we assume clusters are virialized. We further use the mass function of halos to estimate the cluster count. Our results indicate that in order to tighten constraints on the cosmological parameters with SZE surveys, the system uncertainty induced by halo shaped should be taken into account.
出处
《天文学报》
CSCD
北大核心
2005年第4期353-363,共11页
Acta Astronomica Sinica
关键词
宇宙学:宇宙微波背景
星系:星系团
普通
cosmology： cosmic microwave background, galaxies： clusters： general
