报告题目：Galaxy-galaxy lensing from 201 x ray and optical cross-identified groups

报 告 人：罗文涛 博士 (上海天文台)

摘　  要：Galaxy-galaxy lensing is now an important proble of the dark matter distribution. The first step of the project is to achieve accurate image shape measurement to minimize the effect of PSF and other systematics namely as selection bias, calibration bias, etc. We use Bernstein & Jarvis (2002) together with Hirata & seljak (2003) method to build our own image processing pipeline and control the systematics below 1.0% tested by SHERA software developed by Mandelbaum et al 2011. And then we process the images around 201 x ray and optical cross identified groups from Wang et al 2012. From the processed data we get the preliminary signal around x ray peaks and central galaxies respectively. As in Goerge et al (2012), our results also shows a preference that central galaxies are closer to the real potential center than x ray peaks.

报告时间：5月15日（周三）上午10:00

报告地点：苏富特大厦一楼会议室

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　　　　　　　 　　　　　　　　　　　　　　　 南京大学天文与空间科学学院