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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Potential Due to a Magnetized Object01:24

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Un entorno altamente magnetizado en un sistema binario de púlsares

Dongzi Li1, Anna Bilous2, Scott Ransom3

  • 1Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA, USA. dongzili@caltech.edu.

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|May 17, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Los púlsares araña, como PSR B1744-24A, exhiben entornos muy magnetizados. La evidencia sugiere que estos campos magnéticos influyen en la emisión de púlsares y pueden ser similares a las condiciones encontradas en algunas ráfagas de radio rápidas (FRB).

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Área de la Ciencia:

  • Astronomía y astrofísica
  • Física de los púlsares
  • Sistemas de estrellas binarias

Sus antecedentes:

  • Los púlsares araña son púlsares de milisegundos en órbitas cercanas con estrellas compañeras de baja masa.
  • Estos sistemas exhiben fenómenos como la ablación de plasma, retrasos en el tiempo y eclipses de emisión de radio pulsar.
  • Se supone que el campo magnético de la estrella compañera influye en la evolución del sistema binario y las propiedades del eclipse.

Objetivo del estudio:

  • Para investigar el entorno magnetizado del sistema de púlsares araña PSR B1744-24A.
  • Para analizar las variaciones de polarización y rotación para comprender las propiedades del campo magnético.
  • Para explorar las conexiones potenciales entre el comportamiento de los púlsares de araña y las ráfagas rápidas de radio (FRB).

Principales métodos:

  • Observación de los cambios de polarización circular (V) en el PSR B1744-24A.
  • Análisis de cambios irregulares y rápidos en la medida de rotación (RM) en varias fases orbitales.
  • Comparación del comportamiento de polarización observado con las características conocidas de FRB.

Principales resultados:

  • Los cambios de perfil de polarización circular semirregular indican la conversión de Faraday, restringiendo el campo magnético acompañante a > 10 G.
  • Las variaciones irregulares y rápidas de RM sugieren una fuerza de campo magnético del viento estelar > 10 mG.
  • El comportamiento de polarización observado muestra similitudes con la repetición de ráfagas de radio rápidas (FRB).

Conclusiones:

  • PSR B1744-24A posee un entorno altamente magnetizado, con campos magnéticos significativos tanto del compañero como de su viento estelar.
  • Los fenómenos observados, incluida la conversión de Faraday y las variaciones de RM, proporcionan una fuerte evidencia de estos campos magnéticos.
  • Las similitudes con los FRB sugieren que una fracción de los FRB puede originarse en sistemas binarios como los púlsares araña.