Census shows gas-gobbling in galaxies is increasingly common.
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References
Alexander, D. M. et al. The Chandra deep field north survey. XIII. 2Ms point-source catalogs. Astronomical Journal, 126, 539 - 574, (2003).
Barger, A. J. et al. Optical and infrared properties of the Chandra deep field north X-ray sources. Astronomical Journal, 126, 632 - 665, (2003).
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Baker, J. Deep X-ray scan reveals black-hole baby boom. Nature (2003). https://doi.org/10.1038/news030818-6
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DOI: https://doi.org/10.1038/news030818-6