1 paper · 1 filter
J. P. Torres-Papaqui, R. Coziol, J. M. Islas-Islas +2
In a sample of 476931 NELGs obtained from the SDSS DR5 data we find that in 22% of the galaxies the emission line [OIII]λ5007, Hβ, or both, are missing. The nature of the activ…