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One of the key open questions in cosmology today pertains to understandingwhen, where and how super massive black holes form, while it is clear thatmergers likely play a significant role in the growth cycles of black holes, howsupermassive black holes form, and how galaxies grow around them. Here, wepresent Hubble Space Telescope WFC3/IR grism observations of a clumpy galaxy atz=1.35, with evidence for 10^6 - 10^7 Msun rapidly growing black holes inseparate sub-components of the host galaxy. These black holes could have beenbrought into close proximity as a consequence of a rare multiple galaxy mergeror they could have formed in situ. Such holes would eventually merge into acentral black hole as the stellar clumps/components presumably coalesce to forma galaxy bulge. If we are witnessing the in-situ formation of multiple blackholes, their properties can inform seed formation models and raise thepossibility that massive black holes can continue to emerge in star-forminggalaxies as late as z=1.35 (4.8 Gyr after the Big Bang).

Evidence for Three Accreting Black Holes in a Galaxy at z~1.35: A Snapshot of Recently Formed Black Hole Seeds?