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World's slowest pulsar discovered

17.05.2017

The rotation period of the X-ray pulsar AX J1910.7+0917 is 36×200 seconds. The celestial body was discovered back in 2001, but astronomers managed to determine the period of its rotation only now.

A team of European astronomers led by Lara Sidoli from the National Institute of Astrophysics and Space Physics in Milan has discovered the slowest X-ray pulsar, AX J1910.7+0917. It has a rotation period of 36 seconds. This long period makes it the slowest X-ray pulsar known so far.

Like radio and X-ray pulsars, they are neutron stars with strong magnetic fields. They spend their own rotational energy on accretion, that is, the flow of matter from the "neighbor" star onto the surface of the neutron star. X-ray pulsars are among the brightest objects in the X-ray sky.

The pulsar AX J1910.7+0917 was discovered by a Japanese satellite in 2001. Initially, astronomers classified it as a relatively weak X-ray source. Due to the fact that the discovered pulsar was located near the remnant of supernova W49, which was observed by NASA's Chandra space X-ray observatory, it came under the close attention of astronomers.

Lara Sidoli's team analyzed Chandra's data on the pulsar AX J1910.7+0917 over several years. The researcher managed to determine that such a long period of rotation of the neutron star of the pulsar can be explained by a special regime of quasi-spherical accretion of the stellar wind onto the pulsar.

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