Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester.
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However, the infall rate of matter onto an AGN is not constant. Like a river, the flow can sometimes surge, and other times drop to a trickle. In turn, this can affect the brightness of an AGN. So, Hayes' team searched the Hubble Ultra Deep Field for anything that changed brightness because that variation could indicate an AGN.
"Many of these objects seem to be more massive than we originally thought they could be at such early times — either they formed very massive or they grew extremely quickly," said Stockholm' University's Alice Young, who is a member of Hayes' team, in a/J. DePasquale )of 6.7, meaning that we see it as it existed around 12.8 billion years ago. Another AGN, designated 101159, is at a similar redshift of 6.
'"The formation mechanism of early black holes is an important part of the puzzle of galaxy evolution," said Hayes."Together with models for how black holes grow, galaxy evolution calculations can now be placed on a more physically motivated footing, with an accurate scheme for how black holes came into existence from collapsing massive stars.
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