Near-Infrared Spectroscopy of Seyfert Galaxies. Nuclear Activity and
  Stellar Population
  Near-infrared spectroscopic data for the five Seyfert galaxies with jet-gas
interaction Mrk 348, Mrk 573, Mrk 1066, NGC 7212, and NGC 7465, taken with the
LIRIS near-infrared camera/spectrometer at the William Herschel Telescope (WHT)
are reported. The long-slit spectra reveal the characteristic strong emission
lines of this type of objects. Many forbidden transitions and hydrogen
recombination lines are employed here to study the excitation and ionization
mechanisms that are dominating the narrow-line region emission of these
objects, that is affected by the radio-jet interaction. Several absorption
features are also detected in the H and K bands of these galaxies, allowing us
to identify the spectral types that are producing them. We find that the
continuum can be reproduced by a combination of late-type stellar templates
plus a Blackbody component associated to host dust, mainly contributing to the
K band emission. The detection of the permitted O I and Fe II lines and broad
components of the hydrogen recombination lines in the spectra of Mrk 573 and
NGC 7465 allows the reclassification of these two galaxies that are not
canonical Type-2 Seyferts: Mrk 573 is confirmed to be an obscured Narrow-line
Seyfert 1 and NGC 7465 is revealed for the first time as a Type-1 LINER through
its near-infrared spectrum.
