The size and shape of local voids

The size and shape of local voids
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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
S. Basilakos
中科院分区:
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文献类型:
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作者:
M. Plionis;S. Basilakos

文献摘要

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我们研究了局部宇宙中低密度区域的大小和形状,我们在 PSCz 通量限制 IRAS 星系目录的平滑密度场中识别了这些区域。使用我们的数据集和方法量化进入空洞检测的系统偏差后,我们使用 5 h - 1 Mpc 的平滑长度,在 80 h - 1 Mpc 内识别出 14 个空洞(体积 ≥ 10 3 h - 3 Mpc 3 ),并使用 10 h - 1 Mpc 的平滑长度,在 130 h - 1 Mpc 内识别出 8 个空洞(体积 ≥ 8 X 10 3 小时 - 3 Mpc 3).我们研究了空隙尺寸分布和形态,发现长长形和扁圆状球形空隙的数量大致相同。我们将测量的 PSCz 空洞形状和尺寸分布与六种不同的冷暗物质 (CDM) 模型中预期的形状和尺寸分布进行比较,发现只有尺寸分布可以区分模型。 PSCz 数据首选的模型是中间值为 σ 8 (≃ 0.83) 的模型,与宇宙学无关。
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.