Halo properties in cosmological simulations of self-interacting cold dark matter

被引:319
作者
Dave, R
Spergel, DN
Steinhardt, PJ
Wandelt, BD
机构
[1] Princeton Univ Observ, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
关键词
cosmology : theory; dark matter; galaxies : formation; galaxies : halos; methods : n-body simulations;
D O I
10.1086/318417
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a comparison of halo properties in cosmological simulations of collisionless cold dark matter (CDM) and self-interacting dark matter (SIDM) for a range of dark matter cross sections. We find, in agreement with various authors, that CDM yields cuspy halos that are too centrally concentrated as compared to observations. Conversely, SIDM simulations using a Monte Carlo N-body technique produce halos with significantly reduced central densities and flatter cores. We introduce a concentration parameter based on enclosed mass that we expect will be straightforward to determine observationally and present predictions for SIDM and CDM. SIDM also produces more spherical halos than CDM, providing possibly the strongest observational constraint on SIDM. In our simulations with SIDM cross sections sigma DM approximate to 10(-23) to 10(-25) cm(2) GeV-1, collisions reduce the central density in galaxy halos, with larger cross sections producing lower densities. Simulations in the upper end of this range best match current observations of galaxy properties but are disfavored by cluster simulations of Yoshida and colleagues. This problem would be alleviated in models in which the cross section is velocity dependent.
引用
收藏
页码:574 / 589
页数:16
相关论文
共 59 条
[1]   On the formation and evolution of disk galaxies:: Cosmological initial conditions and the gravitational collapse [J].
Avila-Reese, V ;
Firmani, C ;
Hernández, X .
ASTROPHYSICAL JOURNAL, 1998, 505 (01) :37-49
[2]   Cosmology - The cosmic triangle: Revealing the state of the universe [J].
Bahcall, NA ;
Ostriker, JP ;
Perlmutter, S ;
Steinhardt, PJ .
SCIENCE, 1999, 284 (5419) :1481-1488
[3]   High-velocity clouds: Building blocks of the local group [J].
Blitz, L ;
Spergel, DN ;
Teuben, PJ ;
Hartmann, D ;
Burton, WB .
ASTROPHYSICAL JOURNAL, 1999, 514 (02) :818-843
[4]  
BUKERT A, 2000, APJ, V534, pL143
[5]   Reionization and the abundance of galactic satellites [J].
Bullock, JS ;
Kravtsov, AV ;
Weinberg, DH .
ASTROPHYSICAL JOURNAL, 2000, 539 (02) :517-521
[6]   X-ray isophote shapes and the mass of NGC 3923 [J].
Buote, DA ;
Canizares, CR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 298 (03) :811-823
[7]   Cosmological imprint of an energy component with general equation of state [J].
Caldwell, RR ;
Dave, R ;
Steinhardt, PJ .
PHYSICAL REVIEW LETTERS, 1998, 80 (08) :1582-1585
[8]  
CEN R, 2000, UNPUB APJ
[9]   Substructure and halo density profiles in a warm dark matter cosmology [J].
Colín, P ;
Avila-Reese, V ;
Valenzuela, O .
ASTROPHYSICAL JOURNAL, 2000, 542 (02) :622-630
[10]  
DALCANTON JJ, 2000, 25 IAP M DYN GAL EAR, P161