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By
J. R. Souza Leão, Space Telescope Science Institute, Baltimore, MD, USA,
C. Leitherer, Space Telescope Science Institute, Baltimore, MD, USA,
F. Bresolin, IfA, University of Hawai'i, Honolulu, HI, USA,
R. Cid Fernandes, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
We conducted an optical survey (Keck Telescope, 3,700–7,000 Å) of 24 high-metallicity (Z) starburst galaxies to investigate whether high-Zenvironments favor the formation of Wolf–Rayet (WR) stars. We searched for the presence of the He II 4686 Å line produced by the massive WR stars. We detected this feature in six galaxies (25% of the sample). We also used a stellar-population-synthesis code to determine their ages. We find that (i) all galaxies hosting considerable numbers of WR stars are very young systems, with ages log(t) > 8, with t in years; (ii) not all young star-forming galaxies host WR stars, or at least that population cannot be detected in their integrated spectra; and (iii) most galaxies hosting WR populations are found in interacting systems. We for the first time detect WR populations in galaxies ESO 485-G003, NGC 6090, and NGC 2798.
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