magnetars


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magnetars

(mag -nĕ-tarz) Highly magnetized neutron stars, thought to be responsible for soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs). A surface magnetic field of up to 1011 tesla (several hundred times that of a radio pulsar) rapidly slows the star's rotation, causing starquakes that deposit enough energy into the surrounding gases to generate bursts of soft gamma radiation. The field also heats the rotating surface sufficiently for it to emit X-rays, but the rotation is usually too slow for the neutron star to act as a radio pulsar. A large fraction of all neutron stars may be magnetars.
References in periodicals archive ?
Pons, "Relativistic models of magnetars: the twisted-torus magnetic field configuration," Monthly Notices of the Royal Astronomical Society, vol.
It is generally thought that luminous GRBs with bulk Lorentz factors of order [[GAMMA].sub.B] ~ 300 must stem from ultra-relativistic collisionless jets produced by millisecond magnetars and/or collapsars.
Magnetars have a magnetic field of the order of a trillion Gauss.
4, including radio pulsars, MSPs, and magnetars. In particular, it yields [B.sub.d] sin [theta] = 2.8 x [10.sup.8] T for the Crab pulsar, which has P = 0.0332 sec, [??] = 4.22 x [10.sup.-13] [ss.sup.-1], and [L.sub.rot] = 5.1 x [10.sup.31] erg [ss.sup.-1] employing I = 1.1 x [10.sup.38] kg [m.sup.2].
The supernova could have spawned an extremely rare type of star called a millisecond magnetar, a rapidly spinning and very dense star with a very strong magnetic field.
magnetars and GRBs; I will discuss here these transients, their
The Westerlund 1 star cluster, located 16 000 light-years away in the southern constellation of Ara (the Altar), hosts one of the two dozen magnetars known in the Milky Way.
In this sense, the study of compact objects such as black holes, neutron stars, magnetars, etc., is certainly a topic of great interest, mainly, because these objects could be used as remote laboratories to test fundamental physics, in particular, the validity of general relativity in the strong field limit yet (Stella & Vietri 1999, Pachon et al.
These kinematical fields are transferring in space not like a ripple on the river, but like the water itself in the stream (it is worth recalling that specific stars named magnetars have a magnetic field with the density of water).
Electromagnetic radiation from pulsars and magnetars; proceedings.
Such a growth of the magnetic field also explains the phenomenon of magnetars [27, 28].
The unmanned observatory, which is scheduled to launch no later than April 2014, will be the first to measure polarized X-rays to study supermassive black holes and magnetars. Ericsson's work was influential in winning $105 million of funding for the project in 2009.