相关实验视频
Updated: Aug 13, 2026

10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
冲击激发的OH质光束辐射勾勒出银河系中心超新星残留物G359.1-0.05的轮
F Yusef-Zadeh1, K I Uchida, D Roberts
1Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA.
概括
天文学家在银河系中心外 (G359.1-0.5) 附近检测到1720兆赫的扩展氧化 (OH) 质量辐射. 这一发现支持了这样一个理论:超新星残骸膨胀的冲击活动会触发OH质光线.
科学领域:
- 天文学和天体物理学
- 无线电天文学 无线电天文学
- 星际介质 星际介质
背景情况:
- 1720兆赫的基 (OH) 质量线是星际介质中冲击活动的潜在追踪器.
- 银河系中心地区的非热性无线电连续源是研究能量现象的目标.
- 超新星残留物与分子云相互作用,可以产生冲击波.
研究的目的:
- 为了研究来自银河系中心非热性无线电连续源的1720兆赫OH质量线辐射.
- 探索与超新星残留物相关的巨星发射和冲击活动之间的关系.
- 为了确定OH maser的碰撞送所需的条件.
主要方法:
- 使用非常大的阵列 (VLA) 进行无线电观测.
- 搜索了1720兆赫的OH质量线辐射.
- 分析了玛泽特征,连续和分子气体之间的空间相关性.
主要成果:
- 沿连续G359.1-0.5的接口和周围高速分子气体检测到1720兆赫的扩展和紧的OH质光散射.
- 观察到中性气体,非热性外和质光子特征之间的形态相关性.
- 在周围的分子云和OH质粒体斑点之间发现了显著的辐射速度差异 (>50公里/秒).
结论:
- 观察到的OH质粒辐射强烈支持它起源于被膨胀的超新星残留物冲击分子物质的气体的假设.
- 1720兆赫的OH线路的碰撞送的物理条件很可能是由残余的肢体处的一氧化碳气体的特定的低辐射速度组成部分满足的.
相关概念视频
Emission Spectra
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Schwarzschild Radius and Event Horizon
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Shock Waves
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
Atomic Emission Spectroscopy: Overview
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

