Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-06
Astronomy and Astrophysics
Astrophysics
17 pages using emulateapj.sty, 24 figures (4colors), submitted to ApJ, mpeg simulations and psfiles are available at http://
Scientific paper
10.1086/320058
We examine the magnetic reconnection triggered by a supernova (or a point explosion) in interstellar medium, by performing two-dimensional resistive magnetohydrodynamic (MHD) numerical simulations with high spatial resolution. We found that the magnetic reconnection starts long after a supernova shock (fast-mode MHD shock) passes a current sheet. The current sheet evolves as follows: (i) Tearing-mode instability is excited by the supernova shock, and the current sheet becomes thin in its nonlinear stage. (ii) The current-sheet thinning is saturated when the current-sheet thickness becomes comparable to that of Sweet-Parker current sheet. After that, Sweet-Parker type reconnection starts, and the current-sheet length increases. (iii) ``Secondary tearing-mode instability'' occurs in the thin Sweet-Parker current sheet. (iv) As a result, further current-sheet thinning occurs and anomalous resistivity sets in, because gas density decreases in the current sheet. Petschek type reconnection starts and heats interstellar gas. Magnetic energy is released quickly while magnetic islands are moving in the current sheet during Petschek type reconnection. The released magnetic energy is determined by the interstellar magnetic field strength, not energy of initial explosion nor distance to explosion. We suggest that magnetic reconnection is a possible mechanism to generate X-ray gas in Galaxy.
Kudoh Takahiro
Shibata Kazunari
Tanuma Syuniti
Yokoyama Takaaki
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