Two teams of astronomers from NUI Galway’s Centre for Astronomy have made separate breakthroughs in the understanding of how pulsars work. Pulsars are rapidly rotating neutron stars about one and a half times the mass of the sun, but are so small they could fit into Galway Bay. They have a magnetic field which can be greater than a million billion times stronger than the Earth’s magnetic field, and their density is also about a million billion times greater than the density of the Earth. They are formed during a massive explosion at the end of a star’s life known as a ‘type II supernova’.
The first team, led by NUI Galway’s Dr Andy Shearer, compared optical observations with a detailed model of the structure of the pulsar. From this, using their inverse mapping or reverse engineering approach, they were able to establish that most of the light from the pulsar comes from close to the star’s surface. This is contrary to most pulsar models and points to a new way of analysing observational data from pulsars. Their findings have been published in the Monthly Notices of the Royal Astronomical Society.
The second team, consisting of astronomers from NUI Galway, working with colleagues in Italy, the UK and US, discovered an X-ray bright tail coming from a pulsar. The tail was discovered by combining optical observations taken with the European Southern Observatory’s Very Large Telescope and NASA’s Chandra X-Ray observatory. The pulsar, known as PSR J0357, is about half a million years old and is located 1,600 light years from Earth with a tail of over four light years across. Their findings have been recently published in The Astrophysical Journal.
Dr Shearer said: "This is the culmination of 10 years work. Our success is based upon having some talented post graduate students and post doctoral researchers combined with looking at the problem in a different way. The result shows the importance of our approach of combining numerical models run on large supercomputers with detailed observations. To follow these calculations we will use the SFI-funded Galway Astronomical Stokes Polarimeter (GASP) to finally establish the conditions around a pulsar and solve a 40-year-old problem: how do pulsars work?"
The work at NUI Galway involved observations of the Crab pulsar formed in April 1054. Few observations of this event come from Europe, although it was observed by Irish monks and recorded in the Irish Annals.
Niall Kitson
Ltd
