Beloborodov, Andrei M. 2009 伽玛暴辐射机制:正负电子对的热辐射

主要内容:
电子对有质子中子碰撞产生, 电子热辐射后由质子继续加热.

精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0907.0732)

· References in the Article

·

· Translate This Page

Title:		Collisional mechanism for GRB emission
Authors:		Beloborodov, Andrei M.
Publication:		eprint arXiv:0907.0732
Publication Date:		07/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		12 pages, 5 figures, submitted to MNRAS
Bibliographic Code:		2009arXiv0907.0732B

Abstract

GRB jets are expected to carry a neutron component. Strong collisional heating operates in such jets. It is shown to produce bright emission with a spectrum consistent with observations. The radiative mechanism involves inelastic collisions between neutrons and protons, which create multiple e+- pairs with energies ~ m_\pi c^2 = 140 MeV. The created e+- pairs quickly radiate their energy and thermalize. The thermalized e+- population is heated by Coulomb collisions with protons. Numerical simulations of collisionally heated jets are presented. The simulations track the evolution of e+- plasma and radiative transfer in the expanding jet. Jets with Lorentz factors \Gamma > 500 produce the photon spectrum that peaks near 1 MeV and extends to GeV energies with a slope of 2.3-2.5, which is the typical spectrum reported by GRB observations. Most of this radiation is emitted near the photosphere of the jet. The sub-photospheric collisional heating converts > 30 per cent of the explosion energy to escaping radiation. Additional emission is expected at later stages when neutrons decay and produce collisionless heating.

---

Bibtex entry for this abstract Preferred format for this abstract (see Preferences)