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arXiv 0910.4640astro-ph.CO
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RFGC星系的大尺度集体运动

Large-scale collective motion of RFGC galaxies

S. L. Parnovsky, A. S. Parnowski

摘要:

我们处理了1678个来自修订的扁平星系表的扁平边缘螺旋的径向速度和HI线宽的数据。得到了非哈勃星系集体运动大尺度速度场多极分量的参数以及“HI线宽-线直径”形式的广义Tully-Fisher关系的参数。所有的计算都是在三个模型的框架下独立进行的,其中星系速度场的多极分解分别限于偶极项、四极项和八极项。我们发现,四极和八极组件是统计上显着的。根据1623个星系奇特速度的汇编表,我们得到了宇宙学参数Ω_m和σ_8的估计。这个估计值既可以用图形表示,也可以作为值S_8=sigma_8(Omega_m/0.3)^0.35 = 0.91 +/- 0.05的约束条件。

英文摘要:

We processed the data about radial velocities and HI linewidths for 1678 flat edge-on spirals from the Revised Flat Galaxy Catalogue. We obtained the parameters of the multipole components of large-scale velocity field of collective non-Hubble galaxy motion as well as the parameters of the generalized Tully-Fisher relationship in the "HI line width - linear diameter" version. All the calculations were performed independently in the framework of three models, where the multipole decomposition of the galaxy velocity field was limited to a dipole, quadrupole and octopole terms respectively. We showed that both the quadrupole and the octopole components are statistically significant. On the basis of the compiled list of peculiar velocities of 1623 galaxies we obtained the estimations of cosmological parameters Omega_m and sigma_8. This estimation is obtained in both graphical form and as a constraint of the value S_8=sigma_8(Omega_m/0.3)^0.35 = 0.91 +/- 0.05.

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