The halo-to-stellar mass ratio in the S4G

被引：0
作者：
Diaz-Garcia, Simon [1 ]
Salo, Heikki [1 ]
Laurikainen, Eija [1 ]
机构：
[1] Univ Oulu, Astron Res Grp, FI-90014 Oulu, Finland
来源：
FORMATION AND EVOLUTION OF GALAXY OUTSKIRTS | 2016年 / 11卷 / S321期
关键词：
galaxies: structure; galaxies: dark matter; galaxies: statistics;
D O I：
10.1017/S1743921316009182
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use 3.6 mu m photometry for 1154 disk galaxies (i < 65 degrees) in the S(4)G (Sheth et al. 2010). We obtain the average stellar component of the circular velocity (V-disk) and the mean (dark matter) halo-to-stellar mass ratio (M-halo/M-*) inside the optical radius (R-opt) in bins of total stellar mass (M-*, from Munoz-Mateos et al. 2015), providing observational constraints for galaxy formation models to be tested against. We find the M-halo/M-* - M-* relation in good agreement with the best-fit model at z approximate to 0 in Lambda CDM cosmological simulations (e.g. Moster 2010), assuming that the dark matter halo within R-opt comprises a constant fraction (similar to 4%) of its total mass.
引用
收藏
页码：281 / 281
页数：1
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