Detection of a supervoid aligned with the cold spot of the cosmic microwave background
Detection of a supervoid aligned with the cold spot of the cosmic microwave background
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检测与宇宙微波背景冷点对齐的超空洞
DOI：
10.1093/mnras/stv488
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发表时间：
2014
影响因子：
4.8
通讯作者：
R. Wainscoat
中科院分区：
文献类型：
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作者：
I. Szapudi;A. Kov'acs;B. Granett;Z. Frei;J. Silk;W. Burgett;S. Cole;P. Draper;D. Farrow;N. Kaiser;E. Magnier;N. Metcalfe;J. Morgan;P. Price;J. Tonry;R. Wainscoat
利用WISE-2 MASS红外星系表和Pan-STARRS 1（PS1）星系匹配，在宇宙微波背景辐射（CMB）冷点（CS）方向上寻找超空。我们的成像目录的中值红移z = 0.14，我们从PS1的光学颜色中获得光度红移，以创建星系分布的断层扫描图。以CS为中心的径向轮廓显示了一个大的低密度区域，延伸了数十度。受以前CMB结果的启发，我们在两个角半径（5°和15°）内测试欠密度。测光红移仓中的计数在两个基准半径的高检测显著性下分别显示出显著低的密度，分别为1.5 σ和1.6 σ。空洞的最深区域的视线位置为z = 0.15-0.25。我们的数据，结合Granett、Szapudi和Neyrinck早期的测量，与一个大的Rvoid =（220 ± 50）h−1 Mpc的超空相一致，其中心位置为z = 0.22 ± 0.03，δm = −0.14 ± 0.04。这样一个超空，在Λ冷暗物质模型的高斯分布中至少构成了<$3.3 σ的波动，是CS的一个可能的原因。
We use the WISE-2MASS infrared galaxy catalogue matched with Pan-STARRS1 (PS1) galaxies to search for a supervoid in the direction of the cosmic microwave background (CMB) cold spot (CS). Our imaging catalogue has median redshift z ≃ 0.14, and we obtain photometric redshifts from PS1 optical colours to create a tomographic map of the galaxy distribution. The radial profile centred on the CS shows a large low-density region, extending over tens of degrees. Motivated by previous CMB results, we test for underdensities within two angular radii, 5°, and 15°. The counts in photometric redshift bins show significantly low densities at high detection significance, ≳5σ and ≳6σ, respectively, for the two fiducial radii. The line-of-sight position of the deepest region of the void is z ≃ 0.15–0.25. Our data, combined with an earlier measurement by Granett, Szapudi & Neyrinck, are consistent with a large Rvoid = (220 ± 50) h−1 Mpc supervoid with δm ≃ −0.14 ± 0.04 centred at z = 0.22 ± 0.03. Such a supervoid, constituting at least a ≃3.3σ fluctuation in a Gaussian distribution of the Λ cold dark matter model, is a plausible cause for the CS.
DOI：
10.1111/j.1745-3933.2010.00837.x
发表时间：
2010-04
影响因子：
--
作者：
M. N. Bremer;J. Silk;L. Davies;M. D. L. Bristol;Oxford;Gepi;Paris
通讯作者：
M. N. Bremer;J. Silk;L. Davies;M. D. L. Bristol;Oxford;Gepi;Paris