Chandrasekhar–Fermi method

Chandrasekhar–Fermi method or CF method or Davis–Chandrasekhar–Fermi method is a method that is used to calculate the mean strength of the interstellar magnetic field that is projected on the plane of the sky. The method was described by Leverett Davis Jr in 1951[1][2] and independently by Subrahmanyan Chandrasekhar and Enrico Fermi in 1953.[3] According to this method, the magnetic field in the plane of the sky is given by

where is the mass density, is the line-of-sight velocity dispersion and is the dispersion of polarization angles and is an order unity factor, which is typically taken it to be .[4][5][6] The method is also employed for prestellar molecular clouds.[7]

References

  1. Davis, Leverett (1 March 1951). "The Strength of Interstellar Magnetic Fields". Physical Review. 81 (5): 890–891. doi:10.1103/PhysRev.81.890.2.
  2. Davis, Leverett, Jr.; Greenstein, Jesse L. (September 1951). "The Polarization of Starlight by Aligned Dust Grains". The Astrophysical Journal. 114: 206. doi:10.1086/145464.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. Chandrasekhar, S.; Fermi, E. (July 1953). "Magnetic Fields in Spiral Arms". The Astrophysical Journal. 118: 113. doi:10.1086/145731.
  4. Heitsch, Fabian; Zweibel, Ellen G.; Mac Low, Mordecai‐Mark; Li, Pakshing; Norman, Michael L. (10 November 2001). "Magnetic Field Diagnostics Based on Far‐Infrared Polarimetry: Tests Using Numerical Simulations". The Astrophysical Journal. 561 (2): 800–814. doi:10.1086/323489.
  5. Padoan, Paolo; Goodman, Alyssa; Draine, B. T.; Juvela, Mika; Nordlund, Ake; Rognvaldsson, Ornolfur Einar (October 2001). "Theoretical Models of Polarized Dust Emission from Protostellar Cores". The Astrophysical Journal. 559 (2): 1005–1018. doi:10.1086/322504.
  6. Ostriker, Eve C.; Stone, James M.; Gammie, Charles F. (10 January 2001). "Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models". The Astrophysical Journal. 546 (2): 980–1005. arXiv:astro-ph/0008454. doi:10.1086/318290.
  7. Crutcher, Richard M.; Nutter, D. J.; Ward‐Thompson, D.; Kirk, J. M. (January 2004). "SCUBA Polarization Measurements of the Magnetic Field Strengths in the L183, L1544, and L43 Prestellar Cores". The Astrophysical Journal. 600 (1): 279–285. doi:10.1086/379705.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.