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Globular and Fibrous Proteins02:21

Globular and Fibrous Proteins

Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Globular and Fibrous Proteins02:21

Globular and Fibrous Proteins

Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Schwarzschild Radius and Event Horizon01:21

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...
Detection of Black Holes01:10

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...
Globular Proteins01:27

Globular Proteins

In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins can be broadly classified into two distinct subtypes based on their shape and solubilities: globular proteins and fibrous proteins.
Globular proteins serve many important physiological functions, such as acting as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be soluble in the aqueous...
Gravitation Between Spherically Symmetric Masses01:14

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.

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Updated: Jun 1, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation
15:39

Studying Organelle Dynamics in B Cells During Immune Synapse Formation

Published on: June 1, 2019

球状星団の中のブラックホール.

Thomas J Maccarone1, Arunav Kundu, Stephen E Zepf

  • 1School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK. tjm@phys.soton.ac.uk

Nature
|January 5, 2007
PubMed
まとめ

天文学者は,銀河NGC4472.2内の球状星団に黒い穴が集まっていることを検出しました. この発見は,ブラックホールの形成と密度の高い恒星環境での生存の証拠を提供します.

科学分野:

  • 天体物理学 天体物理学
  • 星の動力学 星の動力学
  • X線天文学 X線天文学

背景:

  • 球状星団は,古い星の密集した集合体である.
  • 高い恒星の密度は,恒星の相互作用と衝突が頻繁に起こることを示唆しています.
  • 球状星団内のブラックホールの存在は,その形成と放出の理論的予測のために議論されています.

研究 の 目的:

  • 球状星団におけるブラックホールの存在を調査する.
  • これらの密度の高い恒星系におけるブラックホールの形成と生存に関する観測的証拠を提供するためです.

主な方法:

  • 巨大な円銀河NGC 4472.2にある球状星団のX線観測.
  • コンパクトなオブジェクトの性質を特定するために,X線光度と可変性の分析.

主要な成果:

  • X線光度が約 4 x 10^39 erg s^-1.の増加する物体の検出
  • この物体の明るさは,古い恒星群のブラックホールと一致している.
  • 急速なX線光度変動 (数時間で7倍) は,中性子星の重組を排除する.

結論:

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  • 観測されたX線シグネチャーは,球状星団の内部に黒穴が蓄積していることを示唆しています.
  • この発見は,ブラックホールが球状星団の密集した環境で形成され,持続することを示唆する理論を支持する.
  • この発見は,恒星の進化の最終状態と,密度の高い恒星系におけるコンパクトな物体集団の理解に寄与する.