SDSS-DR4/RASS source matching
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The current view of galaxy formation holds that all massive galaxies harbor a massive black hole at their center, but that these black holes are not always in an actively...
当前学界关于星系形成的主流观点认为,所有大质量星系的中心都蕴藏着一个大质量黑洞(massive black hole),但此类黑洞并非始终处于活跃状态……




