相关实验视频

Updated: Apr 15, 2026

Bringing the Visible Universe into Focus with Robo-AO

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

恒星物理. 恒星物理. 观察大质量原恒星中外流聚合的开始

C Carrasco-González¹, J M Torrelles², J Cantó³

¹Centro de Radioastronomía y Astrofísica UNAM, Apartado Postal 3-72 (Xangari), 58089 Morelia, Michoacán, Mexico. carrasco@crya.unam.mx.

Science (New York, N.Y.)

|April 4, 2015

概括

大规模的原星W75N(B) -VLA 2表现出一个结合的电离风,在18年内从紧变长. 这一观察挑战了同otropic外流模型,支持 toroidal 结构内的偶发风喷射.

科学领域:

* 天体物理学 * 天体物理学
* 恒星形成 * 恒星形成
* 无线电天文学

背景情况:

* 恒星形成的标准模型预测由积聚盘和磁动力学驱动的聚合流出.
* 之前的观测表明来自大质量原星的同位流出,与理论预测形成鲜明对比.

研究的目的:

* 研究来自大质量原恒星W75N(B) -VLA 2的电离风的形态和演变.
* 将观测证据与恒星形成和原恒星外流的理论模型相协调.

主要方法:

*使用非常大阵列 (VLA) 进行无线电连续观测.
*分析了18年时间内原星及其相关水蒸气质星的形态变化.
* 在 toroidal 密度结构中模拟电离风的演变.

主要成果:

* W75N(B) -VLA 2显示了一个热的,合并的电离风.
* 源泉在18年内从一个紧的结构演变为一个长长的结构.
*水蒸汽质光器外从近乎圆形转变为圆形状,表明从同otropic运动转变为协同运动.

结论:

* 观察到的进化支持偶发的,短暂的电离风模型.
*风的形态变化随着它通过 toroidal 密度分层传播.
*这些发现挑战了对大质量原恒星的纯同otropic外流模型.

更多相关视频

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

相关概念视频

Couette Flow

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...

Schwarzschild Radius and Event Horizon

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...

Steady, Laminar Flow Between Parallel Plates

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.

General External Flow Characteristics

General External Flow Characteristics

The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...

Momentum And Radiation Pressure

Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.

Excess Pressure Inside a Drop and a Bubble

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.