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- W3080221208 endingPage "6135" @default.
- W3080221208 startingPage "6112" @default.
- W3080221208 abstract "As deep spectroscopic campaigns extend to higher redshifts and lower stellar masses, the interpretation of galaxy spectra depends increasingly upon models for very young stellar populations. Here we present new HST/COS ultraviolet spectroscopy of seven nearby ($<120$ Mpc) star-forming regions hosting very young stellar populations ($sim$ 4-20 Myr) with optical Wolf-Rayet stellar wind signatures, ideal laboratories in which to test these stellar models. We detect nebular C III] in all seven, but at equivalent widths uniformly $< 10$ {AA}. This suggests that even for very young stellar populations, the highest equivalent width C III] emission at $geq 15$ {AA} is reserved for inefficiently-cooled gas at metallicities at or below that of the SMC. The spectra also reveal strong C IV P-Cygni profiles and broad He II emission formed in the winds of massive stars, including some of the most prominent He II stellar wind lines ever detected in integrated spectra. We find that the latest stellar population synthesis prescriptions with improved treatment of massive stars nearly reproduce the entire range of stellar He II wind strengths observed here. However, we find that these models cannot simultaneously match the strongest wind features alongside the optical nebular line constraints. This discrepancy can be naturally explained by an overabundance of very massive stars produced by a high incidence of binary mass transfer and mergers occurring on short $lesssim 10$ Myr timescales, suggesting these processes may be crucial for understanding the highest-sSFR galaxies in the early Universe. Reproducing both the stellar and nebular light of young systems such as these will be a crucial benchmark for the next generation of stellar population synthesis models." @default.
- W3080221208 created "2020-09-01" @default.
- W3080221208 creator A5011724881 @default.
- W3080221208 creator A5033795907 @default.
- W3080221208 creator A5035756480 @default.
- W3080221208 creator A5053667167 @default.
- W3080221208 creator A5070860847 @default.
- W3080221208 creator A5083991070 @default.
- W3080221208 date "2021-03-27" @default.
- W3080221208 modified "2023-10-09" @default.
- W3080221208 title "Ultraviolet spectra of extreme nearby star-forming regions: Evidence for an overabundance of very massive stars" @default.
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