The Role of Ambipolar Diffusion in the Formation Process of Moderately Magnetized Diffuse Clouds | Zendy

Tsuyoshi Inoue | Zendy; Shuichiro Inutsuka | Zendy; Hiroshi Koyama | Zendy

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The Role of Ambipolar Diffusion in the Formation Process of Moderately Magnetized Diffuse Clouds

Author(s) -

Tsuyoshi Inoue,

Shuichiro Inutsuka,

Hiroshi Koyama

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/514816

Subject(s) - ambipolar diffusion , magnetic field , diffusion , field strength , physics , instability , condensation , bistability , ionization , plasma , mechanics , condensed matter physics , ion , thermodynamics , nuclear physics , quantum mechanics

We investigate the dynamical condensation process in a magnetized thermallybistable medium. We perform one-dimensional two fluid numerical simulationsthat describe the neutral and ionized components in the interstellar mediumwith purely transverse magnetic fields. We find that the clouds that are formedas a consequence of the thermal instability always have a magnetic fieldstrength on the order of a few microgauss irrespective of the initial strength.This shows good agreement with the measurements of the magnetic field strengthin diffuse clouds. We show analytically that the final magnetic field strengthin the clouds is determined by the balance between ambipolar diffusion and theaccumulation of the magnetic field due to condensation.Comment: 4 pages, 4 figures, accepted for publication in the ApJ

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