MATTER DISTRIBUTION AROUND GALAXIES

被引：12
作者：
Masaki, Shogo [1 ]
Fukugita, Masataka [2 ,3 ,4 ]
Yoshida, Naoki [4 ]
机构：
[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan
[2] Inst Adv Study, Princeton, NJ 08540 USA
[3] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[4] Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778583, Japan
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 746卷 / 01期
关键词：
dark matter; galaxies: halos; gravitational lensing: weak; large-scale structure of universe; DIGITAL SKY SURVEY; INITIAL CONDITIONS; LUMINOSITY FUNCTION; MASS; DENSITY; MAGNIFICATION; TRANSIENTS; EVOLUTION; PROFILES; HALOES;
D O I：
10.1088/0004-637X/746/1/38
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We explore the mass distribution of material associated with galaxies from the observation of gravitational weak lensing for the galaxy mass correlation function with the aid of N-body simulations of dark matter. The latter is employed to unfold various contributions to the integrated line-of-sight mass density. We conclude that galaxies have no definite edges of the matter distribution, extending to the middle of neighboring galaxies with the density profile roughly r(-2.4) beyond the virial radius. The mass distributed beyond the virial radius (gravitationally bound radius) explains the gap seen in the mass density estimates, the global value Omega(m) similar to 0.27 and typically Omega(gal) similar to 0.15 from the luminosity density multiplied by the mass-to-light ratio. We suggest using a physical method of gravitational lensing to characterize galaxy samples rather than characterizing them by photometric means.
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页数：6
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