Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...80..205p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 80, no. 1, May 1992, p. 205-209. Research supported by National R
Astronomy and Astrophysics
Astrophysics
5
Active Galactic Nuclei, Emission Spectra, Near Infrared Radiation, Seyfert Galaxies, Star Formation, Hydrogen Recombinations, Infrared Spectra, Molecular Excitation, Variability
Scientific paper
Multiaperture infrared spectra of the circumnuclear region of the Seyfert galaxy NGC 4151 taken over a 10 year period show that the N = 7-4 B-gamma hydrogen recombination line is variable. The H2 quadrupole line emission shows no sign of variability. It is shown that there is a substantial contribution to the nuclear B-gamma flux from the active nucleus, making it impossible to determine star formation rates from infrared hydrogen recombination lines in active galaxies. The lack of variability in the H2 line fluxes indicates that ionizing photons from the active nucleus is not important in exciting the molecular line emission.
Joseph Robert D.
Prestwich Andrea H.
Wright Gillian S.
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