相关实验视频
Updated: May 25, 2026

11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
在不寻常的γ射线瞬态Swift J164449.3+573451中产生相对论外流
B A Zauderer1, E Berger, A M Soderberg
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA. bzauderer@cfa.harvard.edu
Nature
|August 26, 2011
概括
研究人员观察到来自超大质量黑洞的相对论喷气的罕见诞生,由一个被破坏的恒星提供燃料. 这一发现提供了对活跃的银河系核和喷气形成的洞察力,可以在宇宙距离范围内检测到.
科学领域:
- 天文学和天体物理学
- 高能天体物理学 高能天体物理学
- 黑洞物理学 黑洞物理学
背景情况:
- 活跃的银河系核 (AGN) 通过向超大质量黑洞的积累而获得动力,产生相对论喷气.
- 由于AGN喷气机的寿命长,观察它们的诞生是极其罕见的.
- 短暂的积累事件,如恒星潮干扰,提供了一个独特的机会来研究喷气形成.
研究的目的:
- 为了研究与不寻常的积累事件相关的发光无线电瞬态的起源和演变.
- 要确定观察到的瞬态是否代表相对论喷气的诞生.
- 了解驱动超大质量黑洞在短暂增积过程中的相对论外流的物理机制.
主要方法:
- 过渡源Swift J164449.3+573451.3的多波长 (厘米到毫米) 观测结果
- 对无线电瞬态在其第一个月内的演变进行分析.
- 与相对论喷气发射和恒星潮扰乱理论模型的观测特性进行比较.
主要成果:
- 观察到一个发光的无线电瞬态与一个不活跃星系的核相吻合.
- 瞬态的属性与来自百万太阳质量黑洞的新形成的相对论外流相一致.
- 恒星的潮干扰为观测到的高能量和射电发光度提供了自然解释.
结论:
- 这项研究提供了令人信服的证据,证明了相对论外流的诞生,这可能是由恒星潮扰乱引发的.
- 这一事件挑战了现有的模型,这些模型在这种情况下无法预测相对论外流.
- 对类似事件的无线电搜索可以检测到它们的红移大约为6,从而扩大了喷气研究的可观测宇宙.
相关概念视频
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...
Space-Time Curvature and the General Theory of Relativity
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
Dual Nature of Electromagnetic (EM) Radiation
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
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: Interference
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

