對N體數(shù)值模擬中暗物質(zhì)暈的衛(wèi)星星系空間分布的研究
發(fā)布時間:2019-01-03 07:32
【摘要】:對N體數(shù)值模擬中暗物質(zhì)暈的衛(wèi)星星系的空間分布進行三軸橢球擬合,以擬合橢球的軸比來衡量該分布的扁平程度,通過比較不同條件下的軸比分布分析樣本數(shù)量、樣本選取方式以及對樣本徑向分布的歸一化對計算結(jié)果的影響,并考察了暗暈所在的大尺度結(jié)構(gòu)的空間方向與擬合橢球的空間取向之間的關(guān)系.發(fā)現(xiàn)對樣本徑向分布的歸一化對計算結(jié)果具有較大影響,同時發(fā)現(xiàn)大尺度絲狀結(jié)構(gòu)中的暗暈的擬合橢球的短軸更趨于與絲狀結(jié)構(gòu)的方向垂直,而大尺度片狀結(jié)構(gòu)中的暗暈的擬合橢球的短軸則更趨于與片狀結(jié)構(gòu)的法線方向平行.
[Abstract]:The spatial distribution of satellite galaxies with dark matter halos in N body numerical simulation is fitted with a triaxial ellipsoid. The flat degree of the distribution is measured by fitting the axial ratio of the ellipsoid. The number of samples is analyzed by comparing the axial ratio distribution under different conditions. The influence of sample selection mode and the normalization of the radial distribution of the sample on the calculation results is also investigated. The relationship between the spatial direction of the large scale structure of the dark halo and the spatial orientation of the fitting ellipsoid is investigated. It is found that the normalization of the radial distribution of the sample has a great influence on the calculation results, and it is also found that the short axis of the fitting ellipsoid of the dark halo in the large scale filamentous structure tends to be perpendicular to the direction of the filamentous structure. However, the short axis of the fitting ellipsoid of the dark halo in the large scale flake structure tends to be parallel to the normal direction of the lamellar structure.
【作者單位】: 中國科學(xué)院紫金山天文臺;中國科學(xué)院大學(xué);
【基金】:江蘇省杰出青年科學(xué)基金項目(BK20140050) 科技部973項目(2015CM857003,2013CB834900) 國家自然科學(xué)基金項目(11333008,11173056) 中國科學(xué)院B類先導(dǎo)項目(XDB09010403)資助
【分類號】:P145.9
[Abstract]:The spatial distribution of satellite galaxies with dark matter halos in N body numerical simulation is fitted with a triaxial ellipsoid. The flat degree of the distribution is measured by fitting the axial ratio of the ellipsoid. The number of samples is analyzed by comparing the axial ratio distribution under different conditions. The influence of sample selection mode and the normalization of the radial distribution of the sample on the calculation results is also investigated. The relationship between the spatial direction of the large scale structure of the dark halo and the spatial orientation of the fitting ellipsoid is investigated. It is found that the normalization of the radial distribution of the sample has a great influence on the calculation results, and it is also found that the short axis of the fitting ellipsoid of the dark halo in the large scale filamentous structure tends to be perpendicular to the direction of the filamentous structure. However, the short axis of the fitting ellipsoid of the dark halo in the large scale flake structure tends to be parallel to the normal direction of the lamellar structure.
【作者單位】: 中國科學(xué)院紫金山天文臺;中國科學(xué)院大學(xué);
【基金】:江蘇省杰出青年科學(xué)基金項目(BK20140050) 科技部973項目(2015CM857003,2013CB834900) 國家自然科學(xué)基金項目(11333008,11173056) 中國科學(xué)院B類先導(dǎo)項目(XDB09010403)資助
【分類號】:P145.9
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