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Videos de Conceptos Relacionados

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.
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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.
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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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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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Video Experimental Relacionado

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Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Un agujero negro en un cúmulo globular.

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
Resumen

Los astrónomos detectaron un agujero negro en crecimiento en un cúmulo globular dentro de la galaxia NGC 4472.2. Este hallazgo proporciona evidencia de la formación de agujeros negros y su supervivencia en entornos estelares densos.

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Área de la Ciencia:

  • La astrofísica es la astrofísica.
  • La dinámica estelar es la dinámica estelar.
  • Astronomía de rayos X La astronomía de rayos X es una ciencia.

Sus antecedentes:

  • Los cúmulos globulares son densas colecciones de viejas estrellas.
  • Las altas densidades estelares sugieren frecuentes interacciones y colisiones estelares.
  • La existencia de agujeros negros dentro de cúmulos globulares es objeto de debate debido a las predicciones teóricas de su formación y eyección.

Objetivo del estudio:

  • Para investigar la presencia de agujeros negros en cúmulos globulares.
  • Proporcionar evidencia observacional para la formación de agujeros negros y la supervivencia en estos densos sistemas estelares.

Principales métodos:

  • Observaciones de rayos X de un cúmulo globular en la galaxia elíptica gigante NGC 4472.2.
  • Análisis de la luminosidad y variabilidad de rayos X para identificar la naturaleza del objeto compacto.

Principales resultados:

  • Detección de un objeto en acrecentamiento con una luminosidad de rayos X de aproximadamente 4 x 10^39 erg s^-1.
  • La luminosidad del objeto es consistente con un agujero negro en una antigua población estelar.
  • Las rápidas variaciones de luminosidad de rayos X (factor de siete en unas pocas horas) descartan la superposición de estrellas de neutrones.

Conclusiones:

  • La firma de rayos X observada indica fuertemente la presencia de un agujero negro en acrecentamiento dentro del cúmulo globular.
  • Este descubrimiento apoya las teorías que sugieren que los agujeros negros pueden formarse y persistir en los entornos densos de los cúmulos globulares.
  • Los hallazgos contribuyen a comprender los estados finales de la evolución estelar y las poblaciones de objetos compactos en sistemas estelares densos.