천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제39권2호
- /
- Pages.45.2-45.2
- /
- 2014
- /
- 1226-2692(pISSN)
Testing Gravitational Weak-lensing Maps with Galaxy Redshift Surveys: preliminary results
-
Ko, Jongwan
(Korea Astronomy and Space Science Institute (KASI)) ;
- Utsumi, Yousuke (Hiroshima University) ;
- Hwang, Ho Seong (Korea Korea Institute for Advanced Study (KIAS)) ;
- Dell'Antonio, Ian P. (Brown University) ;
- Geller, Margaret J. (Smithsonian Astrophysica Observatory) ;
-
Yang, Soung-Chul
(Korea Astronomy and Space Science Institute (KASI)) ;
-
Kyeong, Jaemann
(Korea Astronomy and Space Science Institute (KASI))
- 발행 : 2014.10.13
초록
To measure the mass distribution of galaxy systems weak-lensing analysis has been widely used because it directly measures the total mass of a system regardless of its baryon content and dynamical state. However, the weak-lensing only provides a map of projected surface mass density. On the other hand, galaxy redshift surveys provide a map of the three-dimensional galaxy distribution. It thus can resolve the structures along the line of sight projected in the weak-lensing map. Therefore, the comparison of structures identified in the weak-lensing maps and in the redshift surveys is an important test of the issues limiting applications of weak-lensing to the identification of galaxy clusters. Geller et al. (2010) and Kurtz et al. (2012) compared massive clusters identified in a dense redshift survey with significant weak-lensing map convergence peaks. Both assessments of the efficiency of weak-lensing map for cluster identification did not draw a general conclusion, because the sample is so small. Thus, we additionally perform deep imaging observations of fields in a dense galaxy redshift survey that contain galaxy clusters at z~0.2-0.5, using CFHT Megacam.
키워드