The Building Blocks for Supermassive Black Holes are Found in Dwarf Galaxies - by spacewriter
Galaxy formation has its own hierarchical model, too. What creates one of those stellar cities? Galaxies like the Milky Way started out as a collection of gas in the early Universe. That gas formed stars, which evolved, died, and spread their materials out to help create new generations of stars . In many senses, dwarf galaxies are more like the primordial galaxies than they are the evolved spirals and ellipticals.
Small stellar-mass black holes could collide, particularly in crowded environments . Eventually, they form more-massive ones. Such “growing black holes” are seen in big, bright galaxies, but what about the dwarfs? Could they have them? If they do, how abundant are they in such small galaxies? And, could they be key to understanding the growth of supermassive black holes?
Their data came from the Sloan Digital Sky Survey, plus the REsolved Spectroscopy of a Local VolumE and Environmental COntext Catalog . They found evidence of growing black holes in a significant percentage of dwarf galaxies. These galaxies sometimes get “tossed out” of surveys of brighter, bigger galaxies because their emissions aren’t well-understood. It turns out, they are a treasure trove for black hole research.
Of course, there are other reasons why a dwarf galaxy could have strong emissions. For example, the dwarfs could have massive spurts of star formation going on. That activity causes bright spectral emissions, too. “We all got nervous,” Polimera said. “The first question to my mind was: Have we missed a way in which extreme star formation alone could explain these galaxies?”
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