从一个紧的恒星合并中产生的奇特的马射线爆发中的磁性出现
Hui Sun1, Chenwei Wang2,3, Jun Yang4,5
1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China.
National science review
|March 10, 2025
概括
这项研究提供了一种毫秒磁力发动机为马射线爆发GRB 230307A提供动力的证据,这可能源于一个紧的恒星合并. 这一发现为中子星状态方程提供了关键的见解.
科学领域:
- 天体物理学 天体物理学
- 高能天体物理学 高能天体物理学
- 核物理 核物理是核物理的.
背景情况:
- 驱动马射线爆发 (GRB) 的中央发动机仍然未被确定,毫秒磁器被提出为一种可能性.
- 紧的恒星合并中的磁星发动机对于限制中子星状态方程至关重要.
- 之前的观测显示了短时间GRB中磁星发动机的间接迹象,但缺乏明确的证据.
研究的目的:
- 为了调查驱动奇特GRB 230307A的中央发动机.
- 为了确定GRB 230307A是否起源于一个紧的恒星合并,并由磁器提供动力.
- 为中子星的状态方程提供约束.
主要方法:
- 对GRB 230307A.的宽带即时发射数据的全面分析.
- 对扩展的发射元件的X射线后发光光曲线的检查.
- 在即时发射阶段对时间中断的高能频段数据的分析.
主要成果:
- 尽管 GRB 230307A 持续了很长时间,但它显示出与紧的恒星合并起源相一致的特性,与千新星有关.
- 随着即时发射的消失,出现了一个扩展的X射线发射组件,暗示了一个磁铁中心发动机.
- 高能波段的无色时空断裂表明一个狭窄的喷流具有特定的开放角度.
结论:
- 这些发现强烈表明,GRB 230307A是由磁星中央发动机驱动的,可能来自于紧的恒星合并.
- 这为磁星作为短GRB引擎提供了令人信服的证据,解决了长期存在的观测差距.
- 这项研究为中子星的状态方程提供了有价值的约束,并阐明了GRB喷射特性.
相关概念视频
Magnetism
6.2K
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...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.2K
Potential Due to a Magnetized Object
253
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.
The vector...
The vector...
253
Atomic Nuclei: Nuclear Relaxation Processes
598
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.
598
Divergence and Curl of Magnetic Field
2.8K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
2.8K
Magnetic Flux
3.4K
The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
3.4K
Detection of Black Holes
2.2K
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...
2.2K


