CLusters in the Uv as EngineS (CLUES). II. Sub-kpc scale outflows driven by stellar feedback
arxiv(2024)
摘要
We analyze the far-ultraviolet spectroscopy of 20 young and massive star
clusters (YSCs) in 11 nearby star-forming galaxies. We probe the interstellar
gas intervening along the line of sight, detecting several metal absorption
lines of a wide range of ionization potentials, from 6.0 eV to 77.5 eV.
Multiple-component Voigt fits to the absorption lines are used to study the
kinematics of the gas. We find that nearly all targets in the sample feature
gas outflowing from 30 up to 190 km per second, often both in the neutral and
ionized phase. The outflow velocities correlate with the underlying stellar
population properties directly linked to the feedback: the mass of the YSCs,
the photon production rate and the instantaneous mechanical luminosity produced
by stellar winds and SNe. We detect a neutral inflow in 4 targets, which we
interpret as likely not associated with the star cluster but tracing larger
scale gas kinematics. A comparison between the outflows energy and that
produced by the associated young stellar populations suggests an average
coupling efficiency of 10 per cent with a broad scatter. Our results extend the
relation found in previous works between galactic outflows and the host galaxy
star-formation rate to smaller scales, pointing towards the key role that
clustered star formation and feedback play in regulating galaxy growth.
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