RECORD
Rayleigh-Taylor stability of a strong vertical magnetic field at the Galactic center confined by a disk threaded with horizontal magnetic field
Astrophysics · Submitted 12 Sep 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim It is shown analytically that when beta= 8(pi)p/B^2 is small and the dense plasma is supported against gravity primarily by rotation, the necessary and sufficient condition for stability to k_z=0 modes is |g| < (2|Omega| a), where g = g* - Omega^2 r is the effective gravity, Omega is the uniform angular velocity, and "a" is the sound speed in the dense plasma.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
Observations of narrow radio-emitting filaments near the Galactic center have been interpreted in previous studies as evidence of a pervasive vertical (i.e. perpendicular to the Galactic plane) milliGauss magnetic field in the central 150 pc of the Galaxy. A simple cylindrically symmetric model for the equilibrium in this central region is proposed in which horizontal (i.e. parallel to the Galactic plane) magnetic fields embedded in an annular band of partially ionized molecular material of radius 150 pc are wrapped around vertical magnetic fields threading low-density hot plasma. The central vertical magnetic field, which has a pressure that significantly exceeds the thermal pressure of the medium, is confined by the weight of the molecular material. The stability of this equilibrium is studied indirectly by analyzing a uniformly rotating cylinder of infinite extent along the z axis in cylindrical coordinates (r,theta,z), with low-density plasma and an axial magnetic field at r< 150 pc, high-density plasma and an azimuthal field at r> 150 pc, and a gravitational acceleration g* proportional to r directed in the negative-r-hat direction. The density profile and gravity tend to destabilize the plasma, but the plasma tends to be stabilized by rotation and magnetic tension--since the interface between the high and low-density plasmas can not be perturbed without bending either the horizontal or vertical field. It is shown analytically that when beta= 8(pi)p/B^2 is small and the dense plasma is supported against gravity primarily by rotation, the necessary and sufficient condition for stability to k_z=0 modes is |g| < (2|Omega| a), where g = g* - Omega^2 r is the effective gravity, Omega is the uniform angular velocity, and "a" is the sound speed in the dense plasma.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Observations of narrow radio-emitting filaments near the Galactic center have been interpreted in previous studies as evidence of a pervasive vertical (i.e. perpendicular to the Galactic plane) milliGauss magnetic field in the central 150 pc of the Galaxy. | background 1.00 | 0.04 | 0.03 | asserted 0.63 |
| s1 | A simple cylindrically symmetric model for the equilibrium in this central region is proposed in which horizontal (i.e. parallel to the Galactic plane) magnetic fields embedded in an annular band of partially ionized molecular material of radius 150 pc are wrapped around vertical magnetic fields threading low-density hot plasma. | contribution 0.60 | 0.86 | 0.05 | asserted 0.80 |
| s2 | The central vertical magnetic field, which has a pressure that significantly exceeds the thermal pressure of the medium, is confined by the weight of the molecular material. | contribution 0.60 | 0.29 | 0.09 | asserted 1.00 |
| s3 | The stability of this equilibrium is studied indirectly by analyzing a uniformly rotating cylinder of infinite extent along the z axis in cylindrical coordinates (r,theta,z), with low-density plasma and an axial magnetic field at r< 150 pc, high-density plasma and an azimuthal field at r> 150 pc, and a gravitational acceleration g* proportional to r directed in the negative-r-hat direction. | method 0.98 | 0.83 | 0.04 | asserted 0.96 |
| s4 | The density profile and gravity tend to destabilize the plasma, but the plasma tends to be stabilized by rotation and magnetic tension--since the interface between the high and low-density plasmas can not be perturbed without bending either the horizontal or vertical field. | interpretation 0.58 | 0.65 | 0.12 | asserted 0.96 |
| s5 | It is shown analytically that when beta= 8(pi)p/B^2 is small and the dense plasma is supported against gravity primarily by rotation, the necessary and sufficient condition for stability to k_z=0 modes is |g| < (2|Omega| a), where g = g* - Omega^2 r is the effective gravity, Omega is the uniform angular velocity, and "a" is the sound speed in the dense plasma. | result 1.00 | 0.94 | 0.80 | asserted 1.00 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
Observations of narrow radio-emitting filaments near the Galactic center have been interpreted in previous studies as evidence of a pervasive vertical (i.e. perpendicular to the Galactic plane) milliGauss magnetic field in the central 150 pc of the Galaxy. A simple cylindrically symmetric model for the equilibrium in this central region is proposed in which horizontal (i.e. parallel to the Galactic plane) magnetic fields embedded in an annular band of partially ionized molecular material of radius 150 pc are wrapped around vertical magnetic fields threading low-density hot plasma. The central vertical magnetic field, which has a pressure that significantly exceeds the thermal pressure of the medium, is confined by the weight of the molecular material. The stability of this equilibrium is studied indirectly by analyzing a uniformly rotating cylinder of infinite extent along the z axis in cylindrical coordinates (r,theta,z), with low-density plasma and an axial magnetic field at r< 150 pc, high-density plasma and an azimuthal field at r> 150 pc, and a gravitational acceleration g* proportional to r directed in the negative-r-hat direction. The density profile and gravity tend to destabilize the plasma, but the plasma tends to be stabilized by rotation and magnetic tension--since the interface between the high and low-density plasmas can not be perturbed without bending either the horizontal or vertical field. It is shown analytically that when beta= 8(pi)p/B^2 is small and the dense plasma is supported against gravity primarily by rotation, the necessary and sufficient condition for stability to k_z=0 modes is |g| < (2|Omega| a), where g = g* - Omega^2 r is the effective gravity, Omega is the uniform angular velocity, and "a" is the sound speed in the dense plasma.
Human review
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.