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関連する概念動画

Eccentricity of an Ellipse01:27

Eccentricity of an Ellipse

An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Galvanometer01:24

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

銀河の平面にある変なバイナリミリ秒パルサー.

David J Champion1, Scott M Ransom, Patrick Lazarus

  • 1Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada. David.Champion@atnf.csiro.au

Science (New York, N.Y.)
|May 17, 2008
PubMed
まとめ
この要約は機械生成です。

PSR J1903+0327は,太陽質量の同伴星と並外れた軌道に乗っているミリ秒パルサーです. この発見は,二重星進化とパルサー形成の従来のモデルに異議を唱えている.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

関連する実験動画

Last Updated: Jul 5, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

科学分野:

  • 天文学と天体物理学について
  • コンパクトなオブジェクト コンパクトなオブジェクト
  • バイナリーシステム バイナリーシステム

背景:

  • バイナリーパルサーシステムは,恒星の進化と極限物理学の理解に不可欠です.
  • ミリ秒パルサー (MSP) は,急速に回転する中性子星です.

研究 の 目的:

  • 新しく発見されたラジオパルサー,PSR J1903+0327.の性質を調査するために.
  • その異常な軌道特性と伴星を理解するために.

主な方法:

  • アレシボ望遠鏡を使用して,電波パルサーを検出するための調査を行った.
  • 伴星を特定するために赤外線観測を行った.
  • 相対論的方法を使用してパルサーのタイミング観測を分析した.

主要な成果:

  • 発見されたPSR J1903+0327は,周期2.15msのミリ秒パルサーです.
  • 太陽の質量の同伴星を周回する95日間の非常に偏心的な (e=0.44) 軌道を観測した.
  • 主相配列の伴星の可能性を特定した.
  • 異常な高パルサー質量1.74 ± 0.04太陽質量を決定しました.

結論:

  • 観測されたシステムは,従来のバイナリ恒星の進化モデルに挑戦しています.
  • 球状星団の放出や階層的な三重体などの代替的な形成シナリオが提案されています.
  • 高い質量は,このパルサーのユニークな形成または進化の経路を示唆しています.