HKU Laboratory for Space Research involved in international collaboration facilitates the discovery of an isolated Millisecond Pulsar with FAST

An International team led by the Chinese Academy of Sciences with scientists from the Mainland, United States and the Laboratory for Space Research of the University of Hong Kong (HKU) has discovered an isolated Millisecond Pulsar (MSP) using the Five-hundred-meter Aperture Spherical Telescope (FAST), the first of its kind discovered with FAST.

The new pulsar, named PSR J0318+0253 after the coordinates of its location in the sky, is an isolated MSP with a spin period of 5.2 ms and an age of approximately 5 billion years, with an estimated distance of about 4,000 light-years.

FAST, nicknamed Tianyan or literally "Heavenly Eye" in Chinese, is the largest single dish radio telescope in the world. It achieved first light in September 2016. Although still under commissioning, FAST has already started taking data and is the most sensitive radio telescope for pulsar searches.

FAST earlier signed a Memorandum of Understanding (MOU) with Fermi (Large Area Telescope of the Fermi Gamma-ray Space Telescope, also known as Fermi-LAT) of the US by virtue of which FAST astronomers have started collaborating with Fermi LAT team members.

“The detection of a millisecond pulsar by the new Chinese FAST, the world's largest single dish radio telescope, is only the first what I am sure will be many such exciting discoveries. I am looking forward to members of the HKU astrophysics community gaining access to this wonderful new facility in the Mainland,” echoed Professor Quentin Parker, Director of the HKU Laboratory for Space Research.

Pulsars are rapidly-spinning neutron stars, formed when a massive star explodes at the end of its life. The first pulsar was discovered in 1967 and approximately 2,500 pulsars are now known. Most pulsars have spin periods of tens of milliseconds to tens of seconds, but some pulsars, the so-called millisecond pulsars, have periods of 1-10 ms. These pulsars, much older than standard pulsars, are thought to be born after young pulsars in binary systems have been "spun" up (or "recycled") through the transfer of angular momentum from their companion. The first millisecond pulsar was discovered in 1982 and only approximately 10% of all known pulsars are MSPs (around 250 pulsars).

In addition to being extremely interesting astrophysical objects, MSPs, due to their mush faster spin periods, as well as their much greater stability, are among the most useful tools in Physics. Indeed, their use in confirming General Relativity resulted in the 1993 Physics Nobel Prize. Future uses of MSPs include the detection of gravitational waves. A large international effort, known as the International Pulsar Timing Array (IPTA) has been organized for this purpose to carry out the precise timing of a collection of MSPs with various radio telescopes around the globe. Given the properties of the new FAST MSP, the new pulsar is likely to be among those used for this purpose.

Image download and illustration: https://www.scifac.hku.hk/news/media?page=1

For media enquiries, please contact Ms Cindy Chan, Senior Communication Manager of HKU Faculty of Science (tel: 3917 5286/ 6703 0212; email: cindycst@hku.hk) or Dr Saz Parkinson at pablosp@hku.hk