Early Black Holes Were Bigger Than We Thought - by ScottyJ_PhD
But there are ways to make those guesses more accurate. Simon employed a measurement known as velocity dispersion – essentially gathering information about the spread of velocities of all the stars gravitationally bound in orbit within a galaxy. This information can be collected using a galaxy’s spectra.
“There’s been the expectation that you would only see these really massive systems in the nearby universe. It takes time for black holes to grow,” says Simon. But that may not be true.
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