The size and shape of local voids
The size and shape of local voids
复制标题
局部空隙的大小和形状
DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
S. Basilakos
中科院分区:
文献类型:
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作者:
M. Plionis;S. Basilakos
We study the size and shape of low-density regions in the local Universe, which we identify in the smoothed density field of the PSCz flux-limited IRAS galaxy catalogue. After quantifying the systematic biases that enter the detection of voids using our data set and method, we identify, using a smoothing length of 5 h - 1 Mpc, 14 voids within 80 h - 1 Mpc (having volumes ≥ 10 3 h - 3 Mpc 3 ) and, using a smoothing length of 10 h - 1 Mpc, eight voids within 130 h - 1 Mpc (having volumes ≥ 8 X 10 3 h - 3 Mpc 3 ). We study the void size distribution and morphologies and find that there is roughly an equal number of prolate and oblate-like spheroidal voids. We compare the measured PSCz void shape and size distributions with those expected in six different cold dark matter (CDM) models and find that only the size distribution can discriminate between models. The models preferred by the PSCz data are those with intermediate values of σ 8 (≃ 0.83), independent of cosmology.