関連する実験動画
Updated: Jul 7, 2026

11:59
High-speed Particle Image Velocimetry Near Surfaces
Published on: June 24, 2013
ラジオ銀河の分布における速度二極体
1Astrophysics, Nuclear and Astrophysics Laboratory, University of Oxford, UK. cab@astro.ox.uk
Nature
|March 15, 2002
まとめ
私たちの銀河系です.
科学分野:
- コスモロジー・コスモロジーとは
- 天体物理学 天体物理学
背景:
- 銀河系が宇宙を通る動きは,宇宙マイクロ波背景放射のドップラーシフトを引き起こし,二極アニソトロピーを生み出します.
- 遠い銀河の分布における同様の二極アニソトロピーは,標準宇宙学モデルによって予測されています.
研究 の 目的:
- 遠い銀河の分布における予測された宇宙学的な二極アニソトロピーを検出するために.
- 宇宙マイクロ波背景放射の標準的な宇宙学的解釈を確認するために.
主な方法:
- 主に宇宙学的距離で,ラジオ銀河の調査を利用した.
- 近くの銀河団からの汚染を最小限に抑えるために,サンプルからローカルなラジオ銀河を取り除きました.
主要な成果:
- 遠くのラジオ銀河の分布における二極アニソトロピーを検出しました.
- 検出された二極は,方向と振幅で宇宙マイクロ波背景二極アニソトロピーと一致します.
結論:
- この発見は,銀河分布における宇宙的二極アニソトロピーの証拠を提供する.
- この結果は,標準宇宙論モデルとその宇宙マイクロ波背景の解釈を裏付けている.
関連する概念動画
Distribution of Molecular Speeds
The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
Magnetic Field Due To A Thin Straight Wire
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Propagation Speed of Electromagnetic Waves
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
Magnetic Field due to Moving Charges
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Due to Two Straight Wires
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Speed of a Transverse Wave
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
One of the key properties of any wave is the wave speed. Light...

