arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0809.3788astro-ph
收藏

超高能宇宙射线局域源的约束条件

Constraints on the Local Sources of Ultra High-Energy Cosmic Rays

Eli Waxman, Abraham Loeb

摘要:

超高能宇宙射线(UHECR)被认为是质子在银河系外源的磁化等离子体流出中加速。将质子加速到~10^{20} eV需要源功率L>10^{47} erg/s。在100 Mpc的GZK视界内没有足够功率的稳定源,这意味着UHECR源是瞬态的。我们证明了UHECR耀斑应该伴随着强X射线和γ射线辐射,并且X射线和γ射线观测对持续时间小于10年的耀斑的约束至少满足以下条件之一:(i)L>10^{50} erg/s;(ii)加速电子携带的能量比磁场携带的能量低10 ^2倍以上,或比加速质子携带的能量低10 ^3倍以上;或(iii)源只存在于低红移处,z<<1。要求(ii)和(iii)的不合理性支持L>10^{50} erg/s的瞬态源。

英文摘要:

Ultra high-energy cosmic rays (UHECRs) are believed to be protons accelerated in magnetized plasma outflows of extra-Galactic sources. The acceleration of protons to ~10^{20} eV requires a source power L>10^{47} erg/s. The absence of steady sources of sufficient power within the GZK horizon of 100 Mpc, implies that UHECR sources are transient. We show that UHECR "flares" should be accompanied by strong X-ray and gamma-ray emission, and that X-ray and gamma-ray surveys constrain flares which last less than a decade to satisfy at least one of the following conditions: (i) L>10^{50} erg/s; (ii) the power carried by accelerated electrons is lower by a factor >10^2 than the power carried by magnetic fields or by >10^3 than the power in accelerated protons; or (iii) the sources exist only at low redshifts, z<<1. The implausibility of requirements (ii) and (iii) argue in favor of transient sources with L>10^{50} erg/s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑