中性子星の合体GW170817における光学超光の運動測定

Kunal P Mooley^1,2, Jay Anderson³, Wenbin Lu^4,5,6,7

¹Caltech, Pasadena, CA, USA. kunal@astro.caltech.edu.

Nature

|October 12, 2022

まとめ

二重中性子星の融合は短時間のガンマ線爆発に関連した相対論的ジェットを作り出します GW170817の新たな分析によりジェット速度の上昇が明らかになり宇宙現象の理解が深まりました

科学分野:

天体物理学
高エネルギー天体物理学
重力波天文学

背景:

二重中性子星の合併GW170817は,構造的相対論ジェットと短いガンマ線爆発とのリンクを証明しました.
以前の研究では放射性VLBIと後照光の曲線を用いて視角と開口角を制限しジェットコアの初期ローレンツ因子を測定した.

研究の目的:

ハッブル宇宙望遠鏡の精密天文測定を用いて GW170817の新しい超光速運動測定を報告する.
ジェット機の翼のローレンツ因子を測定する.
ジェットコアの初期ローレンツ因子を改善します.

主な方法:

ハッブル宇宙望遠鏡の精密天文学を用いて
GW170817に関する以前のVLBIデータと組み合わせたものです.
光速の7倍で測定した超光速の動きを分析する

主要な成果:

構造ジェットの翼のローレンツ因子の測定.
視角 (19〜25度) の制限を大幅に改善しました.
ジェットコアの初期ローレンツ因数 (40以上) の制限を大幅に改善した.

結論:

この研究は,GW170817からの相対論ジェットの構造と性質のより正確な理解を提供します.
強化された制約はニュートロン星の融合におけるジェット発射と拡散の物理を明らかにします
この研究は二重中性子星の融合,相対論的ジェット,そして短いガンマ線爆発の間の関連を洗練している.

さらに関連する動画

06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.5K

12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

21.9K

関連する概念動画

01:11

Atomic Nuclei: Larmor Precession Frequency

1.6K

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,...

1.6K

01:21

Schwarzschild Radius and Event Horizon

2.1K

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...

2.1K

01:10

Detection of Black Holes

2.3K

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...

2.3K

01:05

Doppler Effect - II

3.5K

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...

3.5K

01:14

Gravitation Between Spherically Symmetric Masses

968

The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.

968

00:56

Doppler Effect - I

3.7K

The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...