本文關(guān)鍵詞： 星系演化 衛(wèi)星星系 星系顏色 恒星形成率　出處：《沈陽師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：星系中恒星形成活動降低甚至終止的過程被稱為星系的quenching過程。此過程是當(dāng)前星系形成與演化的熱點問題之一。目前的研究表明,影響星系quenching的因素可歸納為兩類:一類是內(nèi)部原因,如AGN的反饋、超新星爆發(fā)等原因把冷氣體吹離、星系核球的增長);另外一類是外部原因,如環(huán)境影響,星系落入了更大的暗物質(zhì)暈的過程中,受到激波加熱或者引力能轉(zhuǎn)化成熱能加熱或是暗物質(zhì)暈的影響,星系受到周圍星系或者暗物質(zhì)的剝離作用。在標準星系形成與演化模型下,環(huán)境因素對衛(wèi)星星系的quenching影響比中心星系更為重要。最近基于顏色分類標準的研究表明:從近鄰宇宙一直追溯至紅移z~0.8,衛(wèi)星星系的恒星形成終止效率約為0.5。然而,由于受到星系中塵埃紅化的影響,實際上一些基于顏色選擇的“寧靜星系”中的恒星形成活動可能并未終止。因此,本文利用DEEP2/AEGIS巡天的Gerke等人的中等紅移(0.4z1)的星系群表,并結(jié)合SDSS巡天DR7版本的Yang等人的低紅移(0.02z0.07)星系群表,重新研究了星系群環(huán)境對z1星系的quenching的影響。我們對比分析了基于顏色分類和恒星形成率(SFR)分類的結(jié)果。本文的主要結(jié)果如下:(1)在特定的恒星質(zhì)量區(qū)間10.2 log(M/M)10.8???內(nèi),分別用顏色U-B和恒星形成率區(qū)分是否有恒星形成的星系,無論是哪種分類標準,衛(wèi)星星系和中心星系中恒星形成終止的星系比例均隨著紅移的減小而增加,在相同的紅移區(qū)間內(nèi),衛(wèi)星星系中恒星形成終止的比例高于中心星系。(2)基于恒星形成率得到的恒星形成終止的星系比例比基于顏色得到的比例約30%,這導(dǎo)致衛(wèi)星星系中基于恒星形成率分類得到的衛(wèi)星星系quenching效率是前人基于顏色分類結(jié)果的約40%。本文的研究結(jié)果表明:在標準的星系形成與演化模型下,環(huán)境因素對大質(zhì)量衛(wèi)星星系的quenching影響比中心星系顯著,但并不像近期基于顏色分類得到的結(jié)果那么重要。
[Abstract]:The process of decreasing or even terminating star formation in galaxies is called the quenching process of galaxies, which is one of the hot issues in the formation and evolution of galaxies. The factors affecting the quenching of galaxies can be divided into two categories: one is the internal reasons, such as the feedback from AGN, the explosion of supernova and so on, which blow away the cold gas, and the growth of the nuclear sphere of the galaxy; The other is external causes, such as environmental effects, in which galaxies fall into larger dark matter halos, affected by shock wave heating or gravitational energy conversion to heat or dark matter halo. Galaxies are separated by surrounding galaxies or dark matter. In the model of formation and evolution of standard galaxies. The influence of environmental factors on the quenching of satellite galaxies is more important than that of the central galaxies. Recent studies based on color classification criteria have shown that it can be traced back from the nearest universe to the redshift zl0. 8. The termination efficiency of star formation in satellite galaxies is about 0.5. However, it is affected by the redness of dust in the galaxies. In fact, star formation in some "quiet galaxies" based on color selection may not have ceased. In this paper, we make use of the galaxy cluster table of Gerke et al. (Gerke et al.) of the DEEP2/AEGIS survey. Combined with the SDSS Sky Survey DR7 version of Yang et al.'s low redshift 0. 02 z0. 07) Galactic Cluster Table. The effects of cluster environment on the quenching of Z1 galaxy are studied again. We compare and analyze the results of color classification and star formation rate classification. The main results of this paper are as follows: (1). 1) in a specific stellar mass range of 10.2 log / M / M 10.8? ? ? Within, color U-B and star formation rates are used to distinguish galaxies with or without star formation, regardless of classification criteria. The proportion of star formation terminating galaxies in satellite galaxies and central galaxies increases with the decrease of redshift, within the same redshift range. The proportion of star formation terminations in satellite galaxies is higher than that in central galaxies.) the proportion of star formation terminations based on star formation rate is about 30% compared with that based on color. As a result, the quenching efficiency of satellite galaxies based on star formation rate in satellite galaxies is about 40 percent higher than that of other satellite galaxies based on color classification. Under the standard galactic formation and evolution model. The influence of environmental factors on the quenching of large mass satellite galaxies is more significant than that of the central galaxies, but it is not as important as the recent results based on color classification.
【學(xué)位授予單位】：沈陽師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P152

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