ブラックホール 近くで見る
Ramesh Narayan1,2, Eliot Quataert3
1Center for Astrophysics, Harvard & Smithsonian, Cambridge, MA, USA. rnarayan@cfa.harvard.edu.
Nature
|March 23, 2023
まとめ
新しいブラックホールの天体物理学観測は 高温のガスの蓄積と イベントホライゾンの近くでの光の折り曲げを確認し アインシュタインの相対性理論を検証しています ブラックホールが 天文学的な現象を 推進する役割を 探求します
科学分野:
- 天体物理学
- 一般相対性理論
- ブラックホール物理学
背景:
- ブラックホールの事象の地平線の 直接的なイメージングは 天体物理学における 新しい時代を象徴しています
- 観測により 超熱したガスが ブラックホールに蓄積されるという説が確認されました
研究 の 目的:
- ブラックホールの物理学の長年の考えを 確認するためです
- 観測データを用いて アインシュタインの相対性理論を検証する
- ブラックホールが 天文現象に与える影響について 洞察を得るために
主な方法:
- ブラックホール・イベント・ホライゾンの周辺の環境を 画像化するために高度な観測技術を活用します
- 超高温ガスが ブラックホールに蓄積される様子を分析する
- 強い重力場での光線の偏移を測定する.
主要な成果:
- ブラックホールの近くのガスは 太陽の核の数百倍の温度に達していることが確認されました
- 一般相対性理論の予測と一致する 暗い影を作り出す ブラックホールの近くで観測された 大きな光の歪み
- アインシュタインの理論で予測された現象の 直接的な視覚的証拠を提供しました
結論:
- 最近の観測により ブラックホールに関する一般相対性理論の 重要な予測が検証されました
- 重力とブラックホールの天体物理学を 理解する上で 重要な進歩を遂げようとしています
- ブラックホールは様々な天文現象を 駆動する中心的なエンジンとして確認されています
関連する概念動画
01:10Detection 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
01:21Schwarzschild 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...
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
01:17Space-Time Curvature and the General Theory of Relativity
2.9K
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...
2.9K
01:14Gravitation Between Spherically Symmetric Masses
958
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.
958
01:17The Principle of Superposition and the Gravitational Field
1.4K
The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
1.4K
01:17Radiation: Applications
1.2K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.2K