發(fā)布時間：2019-03-14 20:29

【摘要】：星系間的相互作用及合并對于星系的形成和演化有著十分重要的作用,它們自身也是天文觀測和研究中引人注目的物體。從理論上說,星系的相互作用和合并對星系的演化起著主要的推動作用,它們也影響星系的形態(tài)和光譜特征、氣體動力學(xué)、高能過程和核反應(yīng)過程�；跀�(shù)值模擬結(jié)果說明橢圓星系的形成是由于漩渦星系間的相互作用最早由Toomre(1997)[38]提出,Schweizer(1999)對于合并過程對于早期星系盤和橢圓星系的重要性也做過相應(yīng)研究。但由于數(shù)據(jù)的不同和研究者所采用的不同的“星系對”的選擇標(biāo)準(zhǔn),因而他們的樣本在統(tǒng)計結(jié)果上存在部分差異,因而得到的研究結(jié)果也不完全一致。本文基于Allam(2004)[1]和Ellison[8]-[12]等人的工作,分別從SDSSDR7的測光和光譜觀測的數(shù)據(jù)庫中以兩個不同“星系對”的選擇標(biāo)準(zhǔn)證認(rèn)出兩個高質(zhì)量相互作用的“星系對”樣本。隨后,本文對這兩個星系對樣本中的星系對進(jìn)行了交叉證認(rèn),分析了兩個樣本中部分“星系對”樣本的異同并探討產(chǎn)生這些差異的原因。此外,本文還通過從SDSS的數(shù)據(jù)庫中下載該星系的各種測光數(shù)據(jù)和光譜數(shù)據(jù),并且還在相應(yīng)的catalog中找到并收集了對應(yīng)星系的金屬豐度,恒星形成率等數(shù)據(jù),方便隨后對這兩個樣本的性質(zhì)進(jìn)行統(tǒng)計上的分析。另外,本文根據(jù)樣本中真實星系的紅移、星等、半徑的分布模擬了一批星系,并使用相同的星系對標(biāo)準(zhǔn)來選取其中的星系對樣本,以此來考察兩個樣本的投影效應(yīng)和檢測樣本的完備性。
[Abstract]:Intergalactic interactions and mergers play a very important role in the formation and evolution of galaxies. They are also eye-catching objects in astronomical observation and research. Theoretically, the interaction and merging of galaxies play an important role in the evolution of galaxies. They also affect the morphology and spectral characteristics of galaxies, gas dynamics, high energy processes and nuclear reactions. Based on the numerical simulation results, it is shown that the formation of elliptical galaxies is due to the interaction between spiral galaxies, which was first proposed by Toomre (1997) [38] for the importance of the merging process for early galactic disks and elliptical galaxies. However, due to the different data and the different selection criteria of "galaxy pairs" adopted by the researchers, there are some differences in the statistical results of their samples, so the results obtained are not exactly the same. Based on the work of Allam (2004) [1] and Ellison [8]-[12], According to the selection criteria of two different "galactic pairs", two high-quality interacting "galactic pairs" samples were identified from SDSSDR7's database of photometric and spectral observations respectively. Then, this paper cross-identifies the galaxy pairs of the two galaxies, analyzes the similarities and differences of some "galaxy pairs" in the two samples, and discusses the reasons for these differences. In addition, various photometric and spectral data of the galaxy are downloaded from SDSS's database, and the corresponding metallicity, star formation rate and other data of the corresponding galaxies are found and collected in the corresponding catalog. It is convenient to analyze the properties of these two samples statistically. In addition, according to the distribution of the red shift, magnitude and radius of the real galaxies in the sample, this paper simulates a number of galaxies, and uses the same pair of galaxies to select the samples of the pairs of galaxies among them. In this way, the projection effect of two samples and the completeness of the test samples are investigated.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P152

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