Video Experimental Relacionado
Updated: Apr 29, 2026
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
16.9K
Descubrimiento de rayos gamma de muy alta energía desde la cresta del Centro Galáctico
F Aharonian1, A G Akhperjanian, A R Bazer-Bachi
1Max-Planck Institut für Kernphysik, PO Box 103980, D 69029 Heidelberg, Germany.
Nature
|February 10, 2006
Resumen
Los rayos cósmicos galácticos se originan en los restos de supernovas. Las observaciones revelan una emisión de rayos gamma de muy alta energía vinculada a nubes moleculares, lo que sugiere que los protones y los núcleos son la fuente.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Astronomía de alta energía Astronomía de alta energía
- Física de los rayos cósmicos Física de los rayos cósmicos
Sus antecedentes:
- El origen de los rayos cósmicos galácticos (hasta 10^15 eV) no se entiende completamente.
- Los remanentes de supernovas son fuentes hipotéticas, y las observaciones de rayos gamma son clave para estudiar la aceleración y propagación de los rayos cósmicos.
Objetivo del estudio:
- Para investigar la fuente de los rayos cósmicos galácticos.
- Para analizar la emisión de rayos gamma de muy alta energía en la región central de la Vía Láctea.
Principales métodos:
- Observación de la emisión extendida de rayos gamma de muy alta energía (> 10^11 eV).
- Análisis de correlación espacial con nubes moleculares gigantes en el centro galáctico (200 parsecs).
Principales resultados:
- Se detectó una región extendida de emisión de rayos gamma de muy alta energía.
- Esta emisión está espacialmente correlacionada con un complejo de nubes moleculares gigantes.
- La dureza del espectro de rayos gamma sugiere que los rayos cósmicos son protones y núcleos, no electrones.
Conclusiones:
- La emisión de rayos gamma observada probablemente se origina en las interacciones de rayos cósmicos dentro de las nubes moleculares.
- La fuente de energía de estos rayos cósmicos podría ser una sola explosión de supernova hace aproximadamente 10^4 años.
- Este estudio proporciona evidencia que apoya los restos de supernovas como aceleradores de los rayos cósmicos galácticos.
Videos de Conceptos Relacionados
01:10Detection of Black Holes
1.7K
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...
1.7K
01:12Interaction of EM Radiation with Matter: Spectroscopy
4.0K
Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
4.0K
01:22Energy Carried By Electromagnetic Waves
3.4K
Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
3.4K
01:24X-ray Imaging
7.7K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
7.7K
01:19Thomson's e/m Experiment
8.1K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
8.1K
01:20Atomic Emission Spectroscopy: Overview
3.0K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
3.0K