A very rare monster of the heavens has been found. It has a dual personality, it is both a magnetar’ and a pulsar, and seems to switch from one to the other,
Animation illustrating the behaviour of recently discovered Swift J1822.3–1606, a ‘low-field magnetar’ with an intense internal magnetic field that ruptures through the star’s crust in bursts of X-ray emission.
The animation begins with a view of the star’s cracked crust, with organised field lines looped around the star. The surface then fades out to show the twisted internal field, which is many times stronger than its external field. A bright burst follows, and the field becomes less turbulent as the emission fades away.
Credits: ESA–C. Carreau
Magnetars are a type of neutron star, the dead cores of massive stars that have collapsed in on themselves after burning up all their fuel and exploding as dramatic supernovas.
They typically display bright, persistent X-ray emission and the most intense magnetic fields known in the Universe.
Pulsars meanwhile are spinning neutron stars with much lower magnetic fields than magnetars that appear to pulse radio waves as they rotate rapidly.
The pulses are seen when beams of radiation rotate through our line of sight from Earth, rather like the sweeping beam of a lighthouse.
The recently discovered star appears to be a hybrid of these two stellar breeds: the spinning stellar skeleton appears as a pulsar while hiding an intense internal magnetic field much like a magnetar.
The internal field is many times stronger than its external magnetic field, leading to its entry into the new class of ‘low-field magnetars’.
As this animation illustrates, the turbulent interior arises as a result of twisted magnetic field lines.
As the field lines unwind, energy is released as a steady burst of X-rays through fractures in the star’s ‘crust’.
Only two examples of low-field magnetars are known. The first was discovered in 2010 and the second in July 2011, given away by short X-ray bursts that were detected by NASA’s Swift space telescope.
NASA’s Rossi X-Ray Timing Explorer and Chandra X-ray Observatory, ESA’s XMM-Newton and Japan’s Suzaku satellite, as well as the ground-based Gran Telescopio Canarias and the Green Bank Telescope, were alerted and the star’s activity was monitored until April 2012, during which time the outburst began to decay.
The discovery of a second member of this rare family of star strengthens the idea that magnetar-like behaviour may be much more widespread than believed in the past.
Contacts and sources:
Citation: “A new low magnetic field magnetar: the 2011 outburst of Swift J1822.3-1606″ by N. Rea et al. is published in the Astrophysical Journal, vol. 754, 27, doi:10.1088/0004-637X/754/1/27.
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