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Videos de Conceptos Relacionados

Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

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The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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Detection of Black Holes01:10

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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...
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Las fusiones estelares como el origen de las estrellas masivas magnéticas

Fabian R N Schneider1,2,3, Sebastian T Ohlmann4,5, Philipp Podsiadlowski6

  • 1Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, Heidelberg, Germany. fabian.schneider@uni-heidelberg.de.

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Las fusiones masivas de estrellas pueden crear fuertes campos magnéticos y rejuvenecer las estrellas, explicando los rezagados azules magnéticos. Estas estrellas fusionadas pueden ser progenitoras de magnetares e influir en los eventos de supernovas.

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Área de la Ciencia:

  • La astrofísica
  • Evolución estelar
  • Física del plasma

Sus antecedentes:

  • Aproximadamente el 10% de las estrellas masivas poseen campos magnéticos fuertes y a gran escala.
  • La hipótesis de fusión sugiere que la coalescencia estelar produce estos campos magnéticos.
  • Un déficit de estrellas magnéticas en binarios cercanos apoya la hipótesis de la fusión.

Objetivo del estudio:

  • Para investigar los resultados de las fusiones masivas de estrellas usando simulaciones en 3D.
  • Para determinar si las fusiones estelares pueden generar fuertes campos magnéticos.
  • Para explicar las propiedades magnéticas de las estrellas rezagadas azules.

Principales métodos:

  • Simulaciones magnetohidrodinámicas tridimensionales.
  • Modelado la fusión de dos estrellas masivas.
  • Seguimiento de la evolución del producto estelar fusionado.

Principales resultados:

  • Las simulaciones produjeron con éxito fuertes campos magnéticos.
  • Las estrellas fusionadas exhibieron rejuvenecimiento, apareciendo más jóvenes y azules.
  • Esto explica las características de los rezagados azules magnéticos como τ Sco.

Conclusiones:

  • Las fusiones masivas de estrellas son un mecanismo viable para generar fuertes campos magnéticos.
  • Los rezagados azules masivos rejuvenecidos son probablemente los progenitores de los magnetares.
  • Los fuertes campos magnéticos pueden influir en los resultados de las supernovas y potencialmente explicar las ráfagas de radio rápidas.