Cosmic flows in the nearby universe from Type Ia supernovae

被引：201
|
作者：
Turnbull, Stephen J. [1 ]
Hudson, Michael J. [1 ,2 ]
Feldman, Hume A. [3 ]
Hicken, Malcolm [4 ]
Kirshner, Robert P. [4 ]
Watkins, Richard [5 ]
机构：
[1] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada
[3] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[5] Willamette Univ, Dept Phys, Salem, OR 97301 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 420卷 / 01期
基金：
加拿大自然科学与工程研究理事会; 美国国家航空航天局;
关键词：
supernovae: general; cosmological parameters; cosmology: observations; dark matter; large-scale structure of Universe; PECULIAR VELOCITY-FIELD; SKY REDSHIFT SURVEY; LIGHT-CURVE SHAPES; 100 H(-1) MPC; GRAVITY-FIELD; BULK FLOW; DIPOLE ANISOTROPY; LOCAL UNIVERSE; DATA RELEASE; PSCZ DIPOLE;
D O I：
10.1111/j.1365-2966.2011.20050.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Peculiar velocities are one of the only probes of very large scale mass density fluctuations in the nearby Universe. We present new 'minimal variance' bulk flow measurements based upon the 'First Amendment' compilation of 245 Type Ia supernovae (SNe) peculiar velocities and find a bulk flow of 249 +/- 76 km s(-1) in the direction l = 319 degrees +/- 18 degrees, b = 7 degrees +/- 14 degrees. The SNe bulk flow is consistent with the expectations of Lambda cold dark matter (Lambda CDM). However, it is also marginally consistent with the bulk flow of a larger compilation of non-SNe peculiar velocities. By comparing the SNe peculiar velocities to predictions of the IRAS Point Source Catalogue Redshift Survey (PSCz) galaxy density field, we find Omega(0.55)(m) sigma(8,lin) = 0.40 +/- 0.07, which is in agreement with Lambda CDM. However, we also show that the PSCz density field fails to account for 150 +/- 43 km s(-1) of the SNe bulk motion.
引用
收藏
页码：447 / 454
页数：8
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