関連する実験動画
Updated: Jul 5, 2025

07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.6K
宇宙の初期に存在した 小さくて力強いブラックホール
Roberto Maiolino1,2,3, Jan Scholtz4,5, Joris Witstok4,5
1Kavli Institute for Cosmology, University of Cambridge, Cambridge, UK. rm665@cam.ac.uk.
Nature
|January 17, 2024
まとめ
ジェームズ・ウェッブ宇宙望遠鏡は,銀河GN-z11に黒穴が蓄積されていることを発見し,初期の宇宙の黒穴形成に関する洞察を提供し,その高い光度と窒素の豊富さを説明しました.
科学分野:
- 宇宙学と天体物理学
- 初期の宇宙のブラックホール形成
- 銀河の進化
背景:
- 初期の宇宙のブラックホールシード形成と巨大なブラックホールの出現に関する理論は議論されています.
- これらのモデルを検証するには ビッグバン後の最初の数億年のブラックホールの検出と特徴づけが必要です
研究 の 目的:
- 光る銀河GN-z11 (z=10.6) のJWST-NIRSpecスペクトルを分析する.
- ブラックホールの特性を示すスペクトル信号を検出する
- 初期の宇宙における ブラックホールのシード形成と成長のモデルを テストするためです
主な方法:
- JWST-NIRSpecデータを用いたGN-z11の広範なスペクトル分析.
- 活発な銀河核 (AGN) と広範囲の地域特有の放射線および吸収線 ([NeIV]λ2423,C II*λ1335,C IVλ1549) の識別.
- ブラックホールの質量と蓄積速度を推定するために,局所的なビリアル関係を使用する.
主要な成果:
- GN-z11で黒穴が増えていることを確認するスペクトル特徴 ([NeIV],C II*,高密度の星雲線) の検出.
- 活発な銀河核駆動のアウトフロー (800-1,000 km/s) を示すブルーシフトのC IV吸収の谷の観測.
- ブラックホールの推定質量と超エディントン増殖率 (約. エディントン率の5倍).
結論:
- この結果は,エピソード性超エディントン増殖の重量種や中量種/軽量種を含むシナリオを裏付けている.
- GN-z11の黒い穴は,その高光度と非常に高い窒素濃度を説明します.
- この研究は初期の宇宙における ブラックホールの活動に関する 重要な観測証拠を提供します
関連する概念動画
Detection of Black Holes
2.2K
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...
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...
2.2K
Schwarzschild Radius and Event Horizon
2.0K
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...
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...
2.0K
Gravitation Between Spherically Symmetric Masses
905
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.
905
Conservation of Angular Momentum: Application
10.9K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
10.9K
Momentum And Radiation Pressure
2.0K
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.
2.0K
Space-Time Curvature and the General Theory of Relativity
2.7K
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...
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...
2.7K

