Rest-frame UV spectra of two z~8.7 galaxies reveal strong P-Cygni wind profiles and HeII emission best reproduced by stellar population models that include very massive stars, implying an IMF extending beyond 100 solar masses.
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New spectroscopic data on young clusters in NGC 5253 indicate younger ages than photometric estimates and reveal correlations between outflow velocities and cluster properties, showing supernova feedback active at ages over 5 Myr in a 0.3 solar metallicity environment.
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Signatures of Very Massive Stars in the Epoch of Reionization
Rest-frame UV spectra of two z~8.7 galaxies reveal strong P-Cygni wind profiles and HeII emission best reproduced by stellar population models that include very massive stars, implying an IMF extending beyond 100 solar masses.
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Spectroscopic characterization of Young Stellar Populations and their Feedback in NGC 5253
New spectroscopic data on young clusters in NGC 5253 indicate younger ages than photometric estimates and reveal correlations between outflow velocities and cluster properties, showing supernova feedback active at ages over 5 Myr in a 0.3 solar metallicity environment.