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Spectro-temporal properties of a sample of bursts from XTE J1810−197 at 650 MHz are shown. Image credit: Maan et al., 2019.
Using Giant Metrewave Radio Telescope (GMRT), astronomers have observed the magnetar XTE J1810−197 after its recent radio outburst to investigate its emission. Results of the study, presented in a paper published August 12, offer more insights into the nature of this magnetar.
Magnetars - Stars - Fields - Quadrillion - Times
Magnetars are neutron stars with extremely strong magnetic fields, more than quadrillion times stronger than magnetic field of Earth. Decay of magnetic fields in magnetars powers the emission of high-energy electromagnetic radiation, for instance, in the form of X-rays or radio waves.
With a spin period of around 5.54 seconds and magnetic field strength at a level of 2 trillion G, XTE J1810−197 (also known as PSR J1809−1943) was detected as the first of only four known magnetars to emit radio pulsations. In 2003, an X-ray outburst from XTE J1810−197 was observed, while one year later, radio emission from this source was discovered. Afterward, the object showcased highly variable pulsed radio emission until late 2008, when it entered a radio-quiet state.
XTE - J1810−197 - December - Bright - Radio
XTE J1810−197 reactivated on December 8, 2018, when a bright pulsed radio signal at 1.52 GHz was detected from this source. Shortly after the second radio outburst, a team of astronomers led by Yogesh Maan of the Netherlands Institute for Radio Astronomy in Dwingeloo, the Netherlands, commenced an observational campaign of XTE J1810−197 with GMRT in order to uncover the properties of the radio emission from this magnetar.
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