Magnétar

A magnétar is a neutron star having a hyper-powerful Magnetic field, which emits electromagnetic radiations of high energy, like the x-rays and gamma. Robert Duncan and Christopher Thompson postulated their existence in 1992, and in the decade which followed it was accepted like plausible explanation for the Soft gamma repeater and the abnormal pulsars X.

When a Supernova becomes a neutron star, the intensity of its magnetic field grows. Duncan and Thompson calculated that this one, normally already of 108 Tesla S, could exceed under certain conditions 1011 Tesla. Such a magnetic star is then named magnétar.

Tensions causing of the Tremblements of star occur sometimes in the external layers of the magnétars, made up of plasma of heavy elements (mainly of Fer). These very energy vibrations produce puffs of x-rays and gamma. Such a star is named Soft gamma repeater .

It is estimated that a supernova on ten rather gives rise to a magnétar than with a neutron star or a pulsar. The prérequis are a fast rotation and an intense magnetic field before explosion. This magnetic field would be created by a electric Générateur using the nuclear matter convection lasting the ten first second approximately of the life of a neutron star. If the latter turns sufficiently quickly, the currents of convection become total and transfer their energy to the magnetic field. When rotation is too slow, the currents of convection are formed only in local areas.

The magnétars have a magnetic field quite higher than 10 gigatesla. This power is sufficient to erase the contained informations in Credit card at distance equal to that Ground - Sun, and is fatal at the distance Ground the Moon. In comparison, the natural magnetic field of the Earth is of 50 microteslas.

Ace mentioned previously, magnetars cuts has magnetic field off above 10 gigatesla, strong enough to wipe has credit card from the distance off the Sun from the Earth and strong enough to fatal Be from the distance off the Moon. By comparison, Earth' S natural magnetic field is 50 microtesla, and one Earth has fatal magnetic field is only has theoretical possibility; summon off the strongest fields generated are actually used in medical imaging. With small Neodymium based Rare earth magnet has field off butt has Tesla, and most media used for dated storage edge Be erased with millitesla. -->

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External bonds

  • NASA: The discovery of the “magnétars” solves a 19 years mystery
  • Magnétar: an electromagnetic tsunami strikes our solar system
  • Robert C. Duncan, Université from Texas in Austin: “Magnetars”, Software Repeaters Gamma & Very Strong Magnetic Fields
  • NASA Astrophysics Dated System (ADS): Duncan & Thompson, Ap.J. 392, L9) 1992
  • NASA ADS, 1999: Discovery off has Magnetar Associated with the Soft Gamma Repeater SGR 1900+14
  • Chryssa Kouveliotou, Robert Duncan, and Christopher Thompson, “Magnetars,” Scientific American, Feb. 2003, pp. 34-41 (pdf)
  • Robert C. Duncan and Christopher Thompson, “Formation off Very Strongly Magnetized Neutron Stars: Implications for Gamma-Ray Bursts,” Astronomical Newspaper, vol. 392, No 1 (June 10,1992), pp. L9? L13.

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