Video Experimental Relacionado
Updated: Jun 30, 2026
10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
El doble cuásar 0957+561: examen de la hipótesis de la lente gravitacional utilizando la matriz muy grande
Science (New York, N.Y.)
|May 2, 1980
Resumen
Nuevas observaciones de radio del cuásar doble 0957+561 revelan chorros de radio, que apoyan los modelos de lentes gravitacionales. Se necesitan más estudios para confirmar los retrasos de tiempo entre las imágenes de los cuásares.
Área de la Ciencia:
- La astronomía y la astrofísica.
- La radioastronomía es una radioastronomía.
Sus antecedentes:
- El doble cuásar 0957+561 es un objeto clave para el estudio de la lente gravitacional.
- Observaciones anteriores han identificado las principales características de este sistema.
Objetivo del estudio:
- Para confirmar las características previamente reportadas del cuásar doble 0957+561.1.
- Para investigar la presencia y las características de los chorros de radio asociados con los cuásares.
- Para colocar restricciones en los modelos de lentes gravitacionales.
Principales métodos:
- Se realizó una observación de síntesis de radio de 12 horas utilizando el Very Large Array (VLA) a una longitud de onda de 6 centímetros.
- Análisis de la emisión de radio para identificar características estructurales y chorros.
Principales resultados:
- Confirmadas las principales características del cuásar doble 0957+561.
- Demostró la existencia de chorros de radio asociados con ambos cuásares.
- Los chorros de radio imponen restricciones significativas a los modelos de lentes gravitacionales existentes.
Conclusiones:
- Los modelos de lentes gravitacionales están fuertemente respaldados por datos ópticos y de radio recientes.
- Se requieren más observaciones de radio para determinar el retraso de tiempo entre las variaciones en las imágenes del cuásar, un parámetro crucial para el modelado de lentes.
Videos de Conceptos Relacionados
01:10Kepler's First Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
01:21Schwarzschild 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...
01:10Detection 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...
01:17Space-Time Curvature and the General Theory of Relativity
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 motion,...
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 motion,...
01:14Gravitation 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.
01:12Reduced Mass Coordinates: Isolated Two-body Problem
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...