protogalaxy

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pro·to·gal·ax·y

 (prō′tō-găl′ək-sē)
n. pl. pro·to·gal·ax·ies
A cloud of gas, primarily hydrogen, that is forming a galaxy or has sufficient mass to eventually form a galaxy.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

protogalaxy

(ˌprəʊtəʊˈɡæləksɪ)
n, pl -axies
(Astronomy) a cloud of gas in the early stages of its evolution into a galaxy
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Perhaps massive galaxies could develop quickly within deep gravitational wells holding several protogalactic fragments at one time.
Astronomers originally thought that the Milky Way's halo was the first component to congeal out of the protogalactic chaos, when flurries of small gaseous and stellar blobs were rapidly merging into larger structures that would ultimately form the galaxy.