Equilibration processes in the Warm-Hot Intergalactic Medium.pdf

下载文档

3
0
约 13页
2017-04-06 发布于江苏
举报
版权申诉
保障服务

Equilibration processes in the Warm-Hot Intergalactic Medium.pdf

1、本文档共13页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

Equilibration processes in the Warm-Hot Intergalactic Medium

a r X i v : 0 8 0 1 .1 0 0 8 v 1 [ a s t r o - p h ] 7 J a n 2 0 0 8 SSRv manuscript No. (will be inserted by the editor) Equilibration processes in the Warm-Hot Intergalactic Medium A.M. Bykov · F.B.S. Paerels · V. Petrosian Received: 17 September 2007; Accepted: 30 October 2007 Abstract The Warm-Hot Intergalactic Medium (WHIM) is thought to contribute about 40? 50 % to the baryonic budget at the present evolution stage of the universe. The observed large scale structure is likely to be due to gravitational growth of density fluctuations in the post-inflation era. The evolving cosmic web is governed by non-linear gravitational growth of the initially weak density fluctuations in the dark energy dom- inated cosmology. Non-linear structure formation, accretion and merging processes, star forming and AGN activity produce gas shocks in the WHIM. Shock waves are converting a fraction of the gravitation power to thermal and non-thermal emission of baryonic/leptonic matter. They provide the most likely way to power the luminous matter in the WHIM. The plasma shocks in the WHIM are expected to be collisionless. Collisionless shocks produce a highly non-equilibrium state with anisotropic temper- atures and a large differences in ion and electron temperatures. We discuss the ion and electron heating by the collisionless shocks and then review the plasma processes responsible for the Coulomb equilibration and collisional ionisation equilibrium of oxy- gen ions in the WHIM. MHD-turbulence produced by the strong collisionless shocks could provide a sizeable non-thermal contribution to the observed Doppler parameter of the UV line spectra of the WHIM. Keywords intergalactic medium · shock waves · galaxies: clusters: general A.M. Bykov A.F. Ioffe Institute of Physics and Technology, St. Petersburg, 194021, Russia E-mail: byk@astro.ioffe.ru F.B.S. Paerels Columbia Astrophysics Laboratory, Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 100