関連する実験動画
Updated: Mar 7, 2026
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
9.0K
球状星団47トゥカネの中央にある中等質量ブラックホール
Bülent Kızıltan1, Holger Baumgardt2, Abraham Loeb1
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
Nature
|February 10, 2017
まとめ
中間の質量のブラックホールは ブラックホールの進化を理解するために 極めて重要です パルサーの観測は47ツカナエの 中央にあるブラックホールの証拠を明らかにし,これらの物体は電磁的に見えない可能性があることを示唆しています.
科学分野:
- 天文学と天体物理学
- ブラックホール物理学
背景:
- 中等質量ブラックホール (IMBH) は,恒星質量ブラックホールと超大質量ブラックホールの間のギャップを埋めます.
- 球状星団のような密度の高い恒星系が検出の主要なターゲットであるため,それらの存在と形成は不確実である.
- 球状星団における IMBH の以前の探求は,弱々しい電磁気シグネチャによる上部質量制限のみを示した.
研究 の 目的:
- 球状星団47トゥカネ (NGC 104) の中質量ブラックホールの存在と質量を調査する.
- IMBHを研究することでブラックホールの形成と進化の経路を探求する.
主な方法:
- パルサー・タイミングを使って 球状星群47ツカナエの 動的状態を調べる
- ブラックホールの質量を 測定するために ラジオとX線観測データを分析する
主要な成果:
- パルサーのデータを用いて,太陽の質量と同じ質量を持つ 47 Tucanae 中央のブラックホールの証拠が見つかりました.
- 検出されたIMBHには,重要な電磁対照がなく,それは積極的に物質を蓄積していないことを示しています.
結論:
- この発見は,密度の高い恒星環境にあるIMBHが"ガス不足"であり,電磁的に見えないことを示唆している.
- この発見は,銀河の中心で超大質量ブラックホールに成長する可能性があるIMBHの集団の存在を暗示しています.
関連する概念動画
01:10Detection of Black Holes
2.6K
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...
2.6K
01:21Schwarzschild Radius and Event Horizon
2.9K
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...
2.9K
01:14Gravitation Between Spherically Symmetric Masses
1.4K
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.
1.4K
01:12Reduced Mass Coordinates: Isolated Two-body Problem
2.5K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
2.5K
01:27Gravity between Spherical Bodies
9.6K
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
9.6K
01:18Kepler's Third Law of Planetary Motion
4.4K
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
4.4K