fragments collapsing gas releases gravitational potential energy heat temperature pressure increase fragment condenses rotating ball superhot gas known protostar filamentary structures truly ubiquitous molecular cloud dense molecular filaments fragment gravitationally bound cores precursors stars continuous accretion gas geometrical bending magnetic fields may control detailed fragmentation manner filaments supercritical filaments observations revealed quasi periodic chains dense cores spacing comparable filament inner width embedded two protostars gas outflows
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