Fragmentation of Cosmologically Collapsed Layers

Hosokawa Tamaki; ?ishi Tomohiro; Yoshida Tatsuo; Yokosawa Masayoshi

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Fragmentation of Cosmologically Collapsed Layers

机译：宇宙塌陷层的破碎

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Thefragmentationanddynamicsofpancake-likecollapsedlayersarediscussed.Thefragmentationtheoryforanisothermalgaslayerisextendedtothecaseofthetransverseexpansionorcontractionofalayerwithtwocomponents.Theexpansionofalayersuppressesthegrowthofaperturbationandthecontractionenhancestheperturbation.Itisshownthatthegrowthrateincreasesexponentiallywiththedecelerationofexpansion.Thecriticalwavenumberfortheinstabilityisalmostconstantforvariousratesoftheexpansion.Thelinearinteractionofaperturbationbetweenthecooledlayerandahotlayercomposedofdarkmatterchangesthegrowthrate.Thegrowthrateofthecooledlayerissuperiortothemaximumvalueofthegrowthrateinisolatedcaseswhenthescaleheightsofbothlayersarenotsodifferent.Thisfragmentationtheoryisappliedtocosmologicallycollapsedlayersthatwerecalculatedbynumericalsimulations.Thecooledlayersproducedbythecollapsewithtransverseexpansionhavenearlythesamedensityandtemperatureoverawidescalerangeofprimordialdensityfluctuations,??=1a€“20Mpc.Themassoffragmentationisdeterminedbyevaluatingthegrowthtimeoftheperturbationandtheaccretiontimeofthecooledlayer.Thetypicalmassesofthefragmentationaredistributedoveranarrowmassscaleof107a€“8Ma??.Alargedynamicrangeofthecalculation,106a€“8,isrequiredtosimulatethecentralregionofthecollapsedlayerforthefluctuationwavelength,??=10Mpc.Acalculationmethodwithextremelylargedynamicrangeisalsopresented.

机译：Thefragmentationanddynamicsofpancake-likecollapsedlayersarediscussed.Thefragmentationtheoryforanisothermalgaslayerisextendedtothecaseofthetransverseexpansionorcontractionofalayerwithtwocomponents.Theexpansionofalayersuppressesthegrowthofaperturbationandthecontractionenhancestheperturbation.Itisshownthatthegrowthrateincreasesexponentiallywiththedecelerationofexpansion.Thecriticalwavenumberfortheinstabilityisalmostconstantforvariousratesoftheexpansion.Thelinearinteractionofaperturbationbetweenthecooledlayerandahotlayercomposedofdarkmatterchangesthegrowthrate.Thegrowthrateofthecooledlayerissuperiortothemaximumvalueofthegrowthrateinisolatedcaseswhenthescaleheightsofbothlayersarenotsodifferent.Thisfragmentationtheoryisappliedtocosmologicallycollapsedlayersthatwerecalculatedbynumericalsimulations.Thecooledlayersproducedbythecollapsewithtransverseexpansionhavenearlythesamedensityandtemperatureoverawidescalerangeofprimordialdensityfluctuations，?? = 1A€“20Mpc.Themassoffragmentationisdeterminedbye评估扰动的增长时间和冷却层的积聚时间。典型的大块软质碎片分布在107a“ 8Ma”的较大规模上。计算的较大动态范围为106a“ 8”，以模拟可折叠的中心区域为10％，并以10m为单位。

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《PASJ: Publications of the Astronomical Society of Japan》 |2000年第5期|共页
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Hosokawa Tamaki; ?ishi Tomohiro; Yoshida Tatsuo; Yokosawa Masayoshi;
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Fragmentation of Cosmologically Collapsed Layers

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