関連する実験動画
Updated: May 19, 2026

10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
銀河の輝く星団の中心にある,冷却の流れによって引き起こされた巨大な星爆発
M McDonald1, M Bayliss, B A Benson
1MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. mcdonald@space.mit.edu
Nature
|August 17, 2012
まとめ
銀河団は強い冷却の流れを示していますが,反響は通常,冷却を防止します. しかし,SPT-CLJ2344-4243には大規模なスターバーストがあり,フィードバックが発達していないことを示唆しています.
科学分野:
- 天体物理学 天体物理学
- コスモロジー・コスモロジーとは
- 銀河の進化 銀河の進化 銀河の進化
背景:
- 銀河団は,熱いクラスター内プラズマを含んでおり,放射性冷却によって冷却され,中心に向かって"冷却流"を形成します.
- "冷たい核"の星団で観測された低い恒星形成率は,この冷却を相殺するフィードバックメカニズムを暗示しています.
- クールコアクラスターの脱散冷却を防ぐフィードバックソースは,完全に理解されていません.
研究 の 目的:
- 強い冷却フローと巨大なスターバーストを持つ銀河団の異常なケースを調査するために.
- 銀河団における冷却の流れと星形成の調節におけるフィードバックの役割を理解する.
- SPT-CLJ2344-4243.3の中央銀河の星形成経路を調査する.
主な方法:
- 銀河団SPT-CLJ2344-4243.3の多波長観測 (X線,光線,赤外線) を実施しました.
- イントラクラスタープラズマの性質と冷却速度を決定するために,X線データの分析.
- 光学および赤外線データを用いて星形成率の評価.
主要な成果:
- SPT-CLJ2344-4243は,例外的に明るく,強力な冷却フロー (年間3820太陽質量) を表しています.
- 中央銀河は,巨大な星爆発 (年間740太陽質量) を経験しています.
- これらの発見は,フィードバックメカニズムが典型的なクールコアクラスターと比較して,このクラスターで確立されていないことを示唆しています.
結論:
- SPT-CLJ2344-4243で観測されたスターバーストは,イントラクラスター媒体が重要な恒星形成を促す可能性があることを示しています.
- 中央銀河の恒星の大部分は,クラスター内部媒体の増殖によって形成される可能性があります.
- これは,中央銀河の恒星が,主に合併によって集まるという支配的な見解に異議を唱える.
関連する概念動画
Detection of Black Holes
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...
Schwarzschild Radius and Event Horizon
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 velocity with the...
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 velocity with the...
Excess Pressure Inside a Drop and a Bubble
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
Divergence and Curl of Magnetic Field
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
Gravitation Between Spherically Symmetric Masses
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.
Nuclear Fusion
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
