Abstract

AbstractWe analyze spectra of blue compact dwarf galaxies from the Sloan Digital Sky Survey Data Release 7 with Hβλ4861 fluxes exceeding 10−14 erg s−1 cm−2. Nearly all galaxies in our sample show broad Wolf-Rayet (WR) emission in the blue region of the spectrum (the blue bump) consisting of an unresolved blend of NIII λ4640, HeII λ4686 emission lines. Broad CIV λ5808 emission (the red bump) is also detected in a few galaxies. We derive the numbers of early WC (WCE) and late WN (WNL) stars from the luminosities of the red and blue bumps, and the number of O stars from the luminosity of the Hβ emission line and compare the relative number of WR stars N(WR)/N(O+WR) with predictions from evolutionary synthesis models.KeywordsWR GalaxiesBlue Compact Dwarf GalaxiesBlue BumpNIII Λ4640Unresolved BlendsThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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