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Science 21 December 2001:
Vol. 294. no. 5551, p. 2425
DOI: 10.1126/science.294.5551.2425d
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The excessive luminosity of active galactic nuclei (AGNs) has been attributed to a period when black holes at their core were accreting the bulk of their mass. Page et al. (p. 2516) studied the x-ray flux of AGNs where their luminosity peaks (those with redshifts from about 1 to 3). They assign the emission to dust from starburst activity, which reflects star formation, in the bulges of the galaxies. Starburst activity and the period of major growth of the black holes appears to be coeval, which suggests that the source materials for rapid star formation and black hole growth should be similar. Thus, galaxy morphologies in the bulge and the center developed at the same time in a relatively hyperactive universe.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)