Coordinated e-MERLIN, MeerKAT and VLA observations shed new light on black hole ejections

A black hole, ejecting material at close to the speed of light, has been observed using e-MERLIN, the UK’s radio telescope array based at Jodrell Bank Observatory.

A research team based at Oxford University used e-MERLIN, as well as the VLA and MeerKAT based in the US and South Africa, to track the ejecting material over a period of months. The observations have allowed a deeper understanding into how black holes feed energy into their environment. Co-lead of the project, and author on the paper appearing in Nature Astronomy, Rob Fender said "We've been studying these kind of jets for over 20 years and never have we tracked them so beautifully over such a large distance.”

The group successfully tracked these ejections of this particular system, known as MAXI J1820+070, after it went into outburst in the summer of 2018. The extreme distances from the black hole and the final angular separation is among the largest seen from such systems. The ejections are moving so fast that they appear to be moving faster than the speed of light – they are not, rather this is a phenomenon known as apparent superluminal motion.

Figure: Tracking the blackhole ejections over a period of 178

‘Using our radio observations we were able to better estimate how much energy is contained in these ejections using a novel method for this type of system.’ explains Joe Bright, DPhil student at Oxford University’s Department of Physics. ‘Galactic black holes, such as MAXI J1820+070, are thought to be miniature versions of the supermassive black holes that are found at the centre of galaxies. The feedback from these black holes is thought to be a vital component regulating the growth of galaxies’

Dr Rob Beswick, Head of e-MERLIN science operations at Jodrell Bank stated ‘this work shows the power of world-class instruments such as e-MERLIN, MeerKAT and the VLA working in tandem’ and added ‘e-MERLIN’s unique combination of resolution, sensitivity and rapid response made it the perfect instrument for this sort of study’.

The publication can be read in full in Nature Astronomy:


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