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More Images: NASA's Chandra Finds Small Galaxies May Buck the Black Hole Trend
1
X-ray and Optical Images of NGC 6278 & PGC 039620
Credit: X-ray: NASA/CXC/SAO/F. Zou et al.; Optical: SDSS; Image Processing: NASA/CXC/SAO/N. Wolk
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Click for large jpg NGC 6278
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Click for large jpg PGC 039620
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NGC 6278 and PGC 039620 are two galaxies from a sample of 1,600 that were searched for the presence of supermassive black holes. These images represent the results of a study that suggests that smaller galaxies do not contain supermassive black holes nearly as often as larger galaxies do. The study analyzed over 1,600 galaxies that have been observed with Chandra over two decades. Certain X-ray signatures indicate the presence of supermassive black holes. The study indicates that most smaller galaxies like PGC 03620, shown here in both X-rays from Chandra and optical light images from the Sloan Digital Sky Survey, likely do not have supermassive black holes in their centers. In contrast, NGC 6278, which is roughly the same size as the Milky Way, and most other large galaxies in the sample show evidence for giant black holes within their cores.



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