本文選題：伽瑪暴 + 寄主星系　； 參考：《廣西大學》2013年碩士論文

【摘要】：本論文簡要概述伽瑪射線暴(簡稱伽瑪暴)及其余輝的觀測特征和理論模型,并介紹伽瑪暴寄主星系的研究現(xiàn)狀以及伽瑪暴寄主星系的物理特征,隨后重點介紹我們對伽瑪暴寄主星系性質(zhì)的統(tǒng)計分布和相關性研究,并探討這些性質(zhì)的宇宙學演化。 伽瑪暴及其余輝都為研究伽瑪暴前身星和寄主星系提供了重要的信息。主流認為長暴起源于大質(zhì)量恒星的塌縮,短暴起源于雙致密星的合并,對伽瑪暴寄主星系的觀測也支持這種看法。長暴寄主星系一般是較暗的、偏藍、低質(zhì)量、低金屬豐度的恒星形成星系,短暴寄主星系類型比較復雜,但主要也是恒星形成星系。目前已有將近200個伽瑪暴寄主星系被觀測到。從光學到近紅外波段都能夠得到它們的光度測量研究以及它們的輻射線流量,而且光度和輻射線流量都來自恒星形成區(qū)。我們系統(tǒng)研究了長暴寄主星系的統(tǒng)計性質(zhì),發(fā)現(xiàn)(1)寄主星系金屬豐度和星系恒星質(zhì)量之間存在著明顯的相關性,說明寄主星系的總體質(zhì)量對寄主星系化學演化起著重要的作用；(2)SSFR (Specific Star Forming Rate)與恒星質(zhì)量是反相關關系,表明星系的恒星形成活動隨著它的恒星總質(zhì)量的增加而受到抑制,星系間引力潮汐和并合作用是會影響到星系的恒星形成活動；(3)恒星形成率與恒星質(zhì)量存在一定的正相關性,與一般星系的研究結果相-致,證明伽瑪暴寄主星系不是特殊的星系；(4)寄主星系消光與恒星質(zhì)量之間的相關性非常弱,說明對消光的影響主要還是取決于周圍的環(huán)境,與伽瑪暴寄主星系內(nèi)稟性質(zhì)(恒星質(zhì)量)關系不大；(5)伽瑪暴寄主星系消光和X射線氫柱密度沒有任何很強的相關性。 關于宇宙學演化問題,我們將伽瑪暴寄主星系的恒星形成率(SFR)、恒星質(zhì)量、金屬豐度和星系消光等性質(zhì)與相應的紅移比較,發(fā)現(xiàn)SFR隨紅移的增加而增大,而遠寄主星系(1z6.3)比近寄主星系(0.007z1)具有較高的平均恒星質(zhì)量,并且金屬豐度不隨紅移演化,消光也不存在宇宙學演化,反映出消光與星系距離無關。
[Abstract]:In this paper, the observational characteristics and theoretical models of Gamma-ray bursts (GRBs) and their afterglow are briefly summarized, and the present research situation of GRB host galaxies and the physical characteristics of GRBs host galaxies are also introduced. Then we focus on the statistical distribution and correlation of the properties of GRB host galaxies and discuss the cosmological evolution of these properties. Both gamma storms and their afterglow provide important information for the study of gamma storm precursors and host galaxies. It is believed that long bursts originated from the collapse of massive stars and short bursts from the combination of double dense stars. Observations of gamma storm host galaxies also support this view. Long burst host galaxies are usually dark, blue, low mass, low metal abundance star forming galaxies, short storm host galaxies are more complex, but mainly star forming galaxies. Nearly 200 gamma storm host galaxies have been observed. Their photometric measurements and their radiation line flow can be obtained from optical to near infrared bands, and the luminosity and radiation line flow come from the star forming region. We have systematically studied the statistical properties of long burst host galaxies and found that there is an obvious correlation between the metal abundance of host galaxies and the stellar mass of galaxies. It is suggested that the total mass of host galaxies plays an important role in the chemical evolution of host galaxies. The relationship between SSFR-specific Star Forming Rate) and star mass is inversely correlated, indicating that the star formation activity of galaxies is suppressed with the increase of total stellar mass. Intergalactic gravitational tides and convergence are positive correlations between star formation rate and star mass, which may affect star formation activity in galaxies, and are related to the results of studies on general galaxies. The correlation between extinction of host galaxies and stellar mass is very weak, which indicates that the influence of extinction mainly depends on the surrounding environment. There is no strong correlation between the extinction of gamma storm host galaxies and the density of X-ray hydrogen column. With regard to cosmological evolution, we compare the properties of star formation rate (SFR), star mass, metal abundance and galactic extinction of gamma storm host galaxies with the corresponding redshift. It is found that the SFR increases with the increase of redshift. The distant host galaxy (1z6.3) has a higher average stellar mass than the near-host galaxy (0.007z1), and the metal abundance does not evolve with redshift, nor does extinction have a cosmological evolution, indicating that extinction is independent of the distance between the galaxies.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P172.3

【共引文獻】

相關期刊論文 前1條

1 林一清;;費米衛(wèi)星對伽瑪暴的觀測及其對理論模型的挑戰(zhàn)[J];天文研究與技術;2013年04期

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本文編號：1955714