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 0903.1784astro-ph.HE
收藏

通过对产生来自银河系中心的非常高能量伽马射线的时间依赖吸收

Time-dependent absorption of very high-energy gamma-rays from the Galactic center by pair-production

Attila Abramowski, Dieter Horns, Stefan Gillessen, Joachim Ripken, Christopher van Eldik

摘要:

从银河系中心方向探测到了甚高能量(VHE)伽马射线。H.E.S.S.切伦科夫望远镜已经定位了这个伽马射线源,其初步位置不确定性为每轴8.5”(每轴6”统计+6”系统)。在不确定区域内存在几个可能的对应候选者:超大质量黑洞Sgr A*,脉冲星风星云候选者G359.95-0.04,低质量X射线双星系统J174540.0-290031,星团IRS 13,以及自湮灭的暗物质。在实验上,进一步提高该能量范围内的位置精度是非常具有挑战性的,因此,可能不可能将对应候选者之一与VHE源清楚地相关联。在这里,我们提出了一种新的方法来调查的VHE源与附近的环境Sgr A*(约1000史瓦西半径内)的可能联系。这种方法利用了时间和能量依赖的伽马射线吸收效应,这种吸收效应是由靠近SMBH Sgr A* 的恒星的低能光子产生的对产生(在下文中称为对食)产生的。

英文摘要:

Very high energy (VHE) gamma-rays have been detected from the direction of the Galactic center. The H.E.S.S. Cherenkov telescopes have located this gamma-ray source with a preliminary position uncertainty of 8.5" per axis (6" statistic + 6" sytematic per axis). Within the uncertainty region several possible counterpart candidates exist: the Super Massive Black Hole Sgr A*, the Pulsar Wind Nebula candidate G359.95-0.04, the Low Mass X-Ray Binary-system J174540.0-290031, the stellar cluster IRS 13, as well as self-annihilating dark matter. It is experimentally very challenging to further improve the positional accuracy in this energy range and therefore, it may not be possible to clearly associate one of the counterpart candidates with the VHE-source. Here, we present a new method to investigate a possible link of the VHE-source with the near environment of Sgr A* (within approximately 1000 Schwarzschild radii). This method uses the time- and energy-dependent effect of absorption of gamma-rays by pair-production (in the following named pair-eclipse) with low-energy photons of stars closely orbiting the SMBH Sgr A*.

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。

↑