The effects of magnetic fields on the growth of thermal instabilities in cooling flows

Details The effects of magnetic fields on the growth of thermal instabilities in cooling flows The effects of magnetic fields on the growth of thermal instabilities in cooling flows

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337...97d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 97-107.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Models, Cooling Flows (Astrophysics), Intergalactic Media, Magnetic Effects, Thermal Instability, Conductive Heat Transfer, Faraday Effect, Magnetohydrodynamics, Shock Waves, Time Dependence

Scientific paper

The effects of heat conduction and magnetic fields on the growth of thermal instabilities in cooling flows are examined using a time-dependent hydrodynamics code. It is found that, for magnetic field strengths of roughly 1 micro-Gauss, magnetic pressure forces can completely suppress shocks from forming in thermally unstable entropy perturbations with initial length scales as large as 20 kpc, even for initial amplitudes as great as 60 percent. Perturbations with initial amplitudes of 50 percent and initial magnetic field strengths of 1 micro-Gauss cool to 10,000 K on a time scale which is only 22 percent of the initial instantaneous cooling time. Nonlinear perturbations can thus condense out of cooling flows on a time scale substantially less than the time required for linear perturbations and produce significant mass deposition of cold gas while the accreting intracluster gas is still at large radii.

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