本文選題：星系 + 星系團(tuán)　； 參考：《南京師范大學(xué)》2014年碩士論文

【摘要】：星系團(tuán)是宇宙中最大的自引力束縛系統(tǒng),是宇宙大尺度結(jié)構(gòu)的重要示蹤物,是研究星系演化過程及其與環(huán)境相互作用的“實(shí)驗(yàn)室”。在眾多的星系巡天項(xiàng)目中,COSMOS巡天是最重要的深度巡天項(xiàng)目之一,其覆蓋了赤道附近兩平方度的天區(qū),旨在利用地面和空間的主要大型望遠(yuǎn)鏡設(shè)備研究星系的形成、演化及其隨宇宙時間(即紅移)和大尺度結(jié)構(gòu)環(huán)境的變化規(guī)律。 Butcher-Oemler效應(yīng)(簡稱BO效應(yīng))是星系演化研究領(lǐng)域中的重要成果,即星系團(tuán)中藍(lán)星系所占比例隨著紅移的增大而增加。本文基于COSMOS天區(qū)的測光紅移數(shù)據(jù),WenHan(2011)[62]得到了一個包含187個星系團(tuán)的樣本,其中包含大量高紅移的星系團(tuán),非常適合用來研究星系團(tuán)中的藍(lán)星系比例隨紅移的演化效應(yīng)。利用Subaru望遠(yuǎn)鏡的g+、r+和i+星等數(shù)據(jù),我們采用了三種顏色判據(jù)來挑選藍(lán)星系,均發(fā)現(xiàn)星系團(tuán)中藍(lán)星系的比例隨紅移顯著上升。我們確認(rèn)了BO效應(yīng)的存在,還發(fā)現(xiàn)其彌散程度和星系團(tuán)富度有關(guān)。 顏色-星等關(guān)系(簡稱CM關(guān)系)是指橢圓星系的顏色與絕對星等之間的一種線性關(guān)系,反映了早型星系的光譜隨星系質(zhì)量的演化規(guī)律。本文主要研究的是這種線性關(guān)系是如何隨紅移變化的,這種變化是否與環(huán)境密度有關(guān)。本論文采用COSMOS天區(qū)中四個紅移區(qū)間的星系團(tuán)成員星系和場星系中的早型星系樣本,通過對比團(tuán)星系和場星系的CM關(guān)系圖,發(fā)現(xiàn)隨著紅移的增加,星系團(tuán)中早型星系的CM關(guān)系有變陡的趨勢,而場星系的斜率沒有明顯的變化趨勢。在相同的紅移區(qū)間中,兩者的斜率基本一致,沒有發(fā)現(xiàn)顯著的環(huán)境效應(yīng)。
[Abstract]:The cluster of galaxies is the largest self-gravity binding system in the universe and an important tracer of the large-scale structure of the universe. It is also a "laboratory" for studying the evolution of galaxies and their interaction with the environment. Among the many galactic surveys, cosmos is one of the most important deep surveys, covering two square degrees near the equator to study the formation of galaxies using major telescopes on the ground and in space. Evolution and its variation with cosmic time (i.e. redshift) and large scale structural environment. The Butcher-Oemler effect (BO effect) is an important achievement in the field of galaxy evolution, that is, the proportion of blue stars in clusters increases with the increase of redshift. In this paper, we have obtained a sample of 187 clusters of galaxies, which contains a large number of clusters of Gao Hong shifts, based on the photometric redshift data of the COSMOS sky region. [62] A sample of 187 clusters is obtained, which is very suitable for studying the evolution of blue star ratio with redshift in clusters. Three color criteria are used to select the blue star system using the data of the Subaru telescope, such as g r and I stars. It is found that the proportion of blue stars in the cluster increases significantly with the redshift. We have confirmed the existence of BO effect and found that the dispersion degree is related to the rich degree of galaxy cluster. The color-star relation (CM) is a linear relationship between the color of elliptical galaxies and the absolute magnitude, which reflects the evolution of the spectrum of early type galaxies with the mass of galaxies. This paper mainly studies how the linear relation changes with the red shift and whether the change is related to the environmental density. In this paper, by comparing the CM relationship between cluster galaxies and field galaxies in the four red-shift regions of COSMOS, we find that with the increase of redshift, we find that, The CM relation of the early type galaxies in the cluster tends to become steeper, but the slope of the field galaxies has no obvious change trend. In the same red-shift range, the slope of the two is basically the same, and no significant environmental effects are found.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P157.8
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本文編號：1950402