Protostars emit powerful photons even before they form stars

BEIJING, Jan. 6 (Xinhua) — Astronomers have discovered that stars are igniting earlier than expected by the standard star formation model.The achievement, made by an international research team using China’s FAST (Five hundred meter Aperture Spherical Telescope) radio telescope, has been published in the prestigious journal Nature.

FAST, located in Guizhou province in southwestern China, has a reflector with a diameter of 500 m. According to this characteristic, it is considered the only instrument of its kind that detects cosmic radiation in the radio range. The construction of the project was completed in September 2016. At the end of March last year, it became officially available to astronomers from around the world.

Last year, researchers using the FAST telescope successfully measured the strength of the interstellar magnetic field using lines of neutral hydrogen HI.

Using the self-developed HINSA (HI Narrow Self Absorption) method, an international research team led by Chinese scientists Qing Daochong and Li Di investigated the dusty protostellar shell and measured the splitting index of the spectral lines of atoms in the magnetic field located in it for the first time. , which is known as the Zeeman effect, said the National Astronomical Observatory under the Chinese Academy of Sciences.

The obtained value of the magnetic field strength in the dusty protostellar shell is 3.8 plus and minus 0.3 microgauss, which is equal to one 100-thousandth of the level of the Earth’s magnetic field. This figure turned out to be 3-4 times less than the standard model of star formation suggests.

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