在恒星质量黑洞周围的积累盘中,三层大气结构
1Physics Department, University of Alabama in Huntsville, Huntsville, AL 35899, USA. Space Sciences Laboratory, NASA Marshall Space Flight Center, SD50, Huntsville, AL 35812, USA. Center for Space Research, Massachusetts Institute of Technology, Cambrid.
概括
银河系超光流源的X射线光谱建模揭示了三层积聚盘大气层. 这种结构由冷盘,温暖层和可选的热冠组成,为增积盘物理提供了洞察力.
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
- 血物理学的等离子体物理学
背景情况:
- 像GRS 1915+105和GRO J1655-40这样的银河系超光喷射源对于理解积聚过程至关重要.
- 紧物体周围的积聚盘是发射X射线的复杂环境.
研究的目的:
- 为了建模特定银河系超光流源的X射线光谱.
- 为了研究这些来源的内部积聚盘的大气结构.
主要方法:
- 来自GRS 1915+105和GRO J1655-40的X射线辐射的光谱分析.
- 对积累盘的多层大气模型的开发.
主要成果:
- 在内部积累盘中识别了三层大气结构.
- 每个层的温度和光学深度的表征:冷盘 (0.2-0.5 keV),温暖层 (1.0-1.5 keV,光学深度~10),以及可选的热冠 (>100 keV,光学深度~1).
结论:
- 积累盘呈现出一个复杂的,分层的大气.
- 这些积累盘与太阳大气层之间的结构相似性表明了共同的潜在物理机制.
相关概念视频
Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
Structure of Benzene: Molecular Orbital Model
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
Schwarzschild 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...
Detection 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...
Gravitation 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.
Static, Stagnation, Dynamic and Total Pressure
The concept of static, stagnation, dynamic, and total pressure is fundamental in fluid dynamics, often explained using Bernoulli's equation:


