Cosmic flows in the nearby universe from Type Ia supernovae
作者： Stephen J. Turnbull , Michael J. Hudson , Hume A. Feldman , Malcolm Hicken , Robert P. Kirshner
DOI: 10.1111/J.1365-2966.2011.20050.X
关键词: Dark matter 、 Physics 、 Supernova 、 Astrophysics 、 Point source 、 Astronomy 、 Redshift survey 、 Galaxy 、 Cold dark matter 、 Universe 、 Dark flow
摘要: Peculiar velocities are one of the only probes very large scale mass density fluctuations in nearby Universe. We present new ‘minimal variance’ bulk flow measurements based upon ‘First Amendment’ compilation 245 Type Ia supernovae (SNe) peculiar and find a 249 ± 76 km s−1 direction l= 319°± 18°, b= 7°± 14°. The SNe is consistent with expectations Λ cold dark matter (ΛCDM). However, it also marginally larger non-SNe velocities. By comparing to predictions IRAS Point Source Catalogue Redshift Survey (PSCz) galaxy field, we Ω0.55mσ8,lin= 0.40 0.07, which agreement ΛCDM. show that PSCz field fails account for 150 43 km s−1 motion.
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