Metal Poor Accretion in the Early Universe

Metal Poor Accretion in the Early Universe

下载PDF

导出

摘要 In the early Universe, the chemical composition of matter was different from the one today, as then the heavier elements present today were still missing. The structure, evolution and stability of accretion discs in AGNs depends on the chemical composition of the material. I will present first results of model calculations of such primordial accretion discs.For the calculations, I use a generalized viscosity prescription and newly computed opacities in the range 40-40000 K. I will discuss the influence of the primordial chemical composition on the structure and stability of AGN accretion disks and compare them to the present day Universe situation. In the early Universe, the chemical composition of matter was different from the one today, as then the heavier elements present today were still missing. The structure, evolution and stability of accretion discs in AGNs depends on the chemical composition of the material. I will present first results of model calculations of such primordial accretion discs.For the calculations, I use a generalized viscosity prescription and newly computed opacities in the range 40-40000 K. I will discuss the influence of the primordial chemical composition on the structure and stability of AGN accretion disks and compare them to the present day Universe situation.

作者 Michael Mayer

机构地区 Institut für Theoretische Astrophysik

出处《天文研究与技术》 CSCD 北大核心 2003年第S1期151-154,共4页 Astronomical Research & Technology

关键词 FIGURE

分类号 P159.3 [天文地球—天文学]

引文网络
相关文献

1Zheng Wei (Department of Physics and Astronomy, The Johns Hopkins University Baltimore, MD 21218-2686, USA) (Center for Astrophysics University of Science and Technology of China, Hefei, AnHui, 230026).PROBING THE EARLY UNIVERSE WITH DEEP OBSERVATIONS AND LARGE SURVEYS[J].中国科学院上海天文台年刊,2001(1):147-163.
2方励之,刘永镇.THE REST MASS OF NEUTRINOS AND CLUSTERING IN THE EARLY UNIVERSE[J].Chinese Science Bulletin,1982,27(12):1301-1304.
3MENGXin－He.Allowed Parameter Regions for a Tree—Level Inflation Model[J].Communications in Theoretical Physics,2001,35(1):125-128.
4EL-NABULSI Ahmad Rami.Phase Transitions in the Early Universe with Negatively Induced Supergravity Cosmological Constant[J].Chinese Physics Letters,2006,23(5):1124-1127.
5陶必修.The formation of matter structures in the Universe[J].Chinese Physics B,2002,11(3):238-240. 被引量：2
6Jafar Sadeghi,Martiros Khurshudyan,Margarit Hakobyan,Hoda Farahani.Mutually interacting tachyon dark energy with variable G and Λ[J].Research in Astronomy and Astrophysics,2015,15(2):175-190.
7Jean-Claude Pecker,Jayant V.Narlikar,Francois Ochsenbein,Chandra Wickramasinghe.The local contribution to the microwave background radiation[J].Research in Astronomy and Astrophysics,2015,15(4):461-474.
8余洪伟,王永久.Radiating Black Holes With Internal Global Monopoles Imbedded in de Sitter Universe[J].Chinese Science Bulletin,1994,39(19):1602-1606.
9赵东,李明华,王平,常哲.Inflation in de Sitter spacetime and CMB large scale anomaly[J].Chinese Physics C,2015,39(9):65-68.
10Jun-Min Liang,Xiao-Chun Mao,Bo Qin.Cross-correlation of 21 cm and soft X-ray backgrounds during the epoch of reionization[J].Research in Astronomy and Astrophysics,2016,16(8):135-144.

天文研究与技术

2003年第S1期

浏览历史

内容加载中请稍等...

Metal Poor Accretion in the Early Universe

相关作者

相关机构

相关主题

浏览历史