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Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies
Nearly simultaneous observations are reported of Pix, Hix, and H/J emission from 18 Seyfert galaxies and of Lyix from eight of these galaxies. In many cases, Pix is stronger relative to the Balmer lines than is predicted by recombination calculations; reddening appears to be required. Dispersion in the Pix/Hix/H/J ratios orthogonal to the reddening track indicates that high densities or optical depths also affect the line flux ratios. Several galaxies, notably NGC 1275, have very low Pix/Hixdoi:10.1086/159884 fatcat:jdmhh7djprbldakgqtso7p76ky