Rakshit, S.; Stalin, C. S.; Kotilainen, J.; Shin, J.
(IOP Publishing, 2021-03-12)
The study of narrow-line Seyfert 1 galaxies (NLS1s) is now mostly limited to low redshift (z<0.8) because their definition requires the presence of the Hβ emission line, which is redshifted out of the spectral coverage of ...