星系與子暗暈的統(tǒng)計(jì)聯(lián)系
發(fā)布時(shí)間：2018-08-14 08:46
【摘要】：伴隨N體數(shù)值模擬精度的不斷提高,不僅暗物質(zhì)暈的成長(zhǎng)歷史可以被追蹤,位于暗物質(zhì)暈勢(shì)場(chǎng)中的子暗暈的成長(zhǎng)歷史也能夠被追蹤.與暗物質(zhì)暈相比,子暗暈和星系的關(guān)聯(lián)更為緊密.由此發(fā)展出一系列以子暗暈為基礎(chǔ)的研究星系與子暗暈統(tǒng)計(jì)聯(lián)系的研究工作.這類方法介于傳統(tǒng)的暗暈占據(jù)分布模型和星系形成半解析模型之間.星系的位置和速度通過追蹤數(shù)值模擬中的子暗暈的軌道和并合歷史來預(yù)言.星系的物理性質(zhì)如恒星成分質(zhì)量、光度、顏色等由統(tǒng)計(jì)的參數(shù)化模型和其所在暗暈/子暗暈的性質(zhì)直接聯(lián)系起來,而并不通過模擬具體的恒星形成以及反饋等過程確定.本文總結(jié)并介紹這類星系與子暗暈的統(tǒng)計(jì)聯(lián)系的方法,舉例說明典型模型的建立過程,并指出星系-子暗暈關(guān)聯(lián)模型的優(yōu)勢(shì)和應(yīng)用時(shí)需要注意的問題.
[Abstract]:With the improvement of numerical simulation accuracy of N-body, not only the growth history of dark matter halo can be traced, but also the growth history of sub-dark halo located in the potential field of dark matter halo can be tracked. Subhalos are more closely related to galaxies than dark-matter halos. A series of studies on the statistical relationship between galaxies and subhalos have been developed based on the subhalo. This method is between the traditional model of dark halo occupation distribution and the semi-analytic model of galaxy formation. The positions and velocities of galaxies are predicted by tracking the orbits and merging histories of the subhalos in numerical simulations. The physical properties of galaxies, such as the mass, luminosity and color of stars, are directly related to the properties of their dark halos / sub-halos by statistical parameterization models, and are not determined by simulating the specific processes of star formation and feedback. This paper summarizes and introduces the methods of statistical relation between this kind of galaxies and the dark halos, illustrates the process of establishing typical models, and points out the advantages of the galactic-subhalon correlation model and the problems needing attention in its application.
【作者單位】： 中國(guó)科學(xué)院國(guó)家天文臺(tái);
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):11573031,11133003)
【分類號(hào)】：P152
本文編號(hào)：2182290
[Abstract]:With the improvement of numerical simulation accuracy of N-body, not only the growth history of dark matter halo can be traced, but also the growth history of sub-dark halo located in the potential field of dark matter halo can be tracked. Subhalos are more closely related to galaxies than dark-matter halos. A series of studies on the statistical relationship between galaxies and subhalos have been developed based on the subhalo. This method is between the traditional model of dark halo occupation distribution and the semi-analytic model of galaxy formation. The positions and velocities of galaxies are predicted by tracking the orbits and merging histories of the subhalos in numerical simulations. The physical properties of galaxies, such as the mass, luminosity and color of stars, are directly related to the properties of their dark halos / sub-halos by statistical parameterization models, and are not determined by simulating the specific processes of star formation and feedback. This paper summarizes and introduces the methods of statistical relation between this kind of galaxies and the dark halos, illustrates the process of establishing typical models, and points out the advantages of the galactic-subhalon correlation model and the problems needing attention in its application.
【作者單位】： 中國(guó)科學(xué)院國(guó)家天文臺(tái);
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):11573031,11133003)
【分類號(hào)】：P152
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