Broad infrared line emission from the nuclei of Seyfert 2 galaxies

Details Broad infrared line emission from the nuclei of Seyfert 2 galaxies Broad infrared line emission from the nuclei of Seyfert 2 galaxies

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242p...4b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 1, 1990, p. 4P-8P.

Astronomy and Astrophysics

Astronomy

60

Active Galactic Nuclei, Astronomical Spectroscopy, Emission Spectra, Infrared Spectra, Seyfert Galaxies, H Alpha Line, Hydrogen, Near Infrared Radiation, Recombination Reactions, Spectral Line Width

Scientific paper

Spectroscopic observations at lambda/delta-lambda = 300 of the Paschen beta hydrogen recombination line in the narrow line X-ray galaxies NGC 5506 and A0945 - 30 (= MCG-5-23-16), and in the Seyfert 2 galaxy NGC 4388 are reported. The line profiles of NGC 5506 and A0945 - 30 are both found to possess broad components of FWHM greater than 1500 km/s; this removes the previous controversy concerning the presence of broad line components in their H-alpha line profiles. Optical, X-ray and mid-infrared data are used to estimate the extinction towards the line and continuum sources in these objects in order to test the hypothesis that they are in fact moderately obscured Seyfert 1 nuclei. The non-detection of a broad Paschen beta line profile in NGC 4388 is consistent with a scattered (as opposed to a transmitted) origin for the observed off-nuclear broad H-alpha emission, in agreement with models of the optical emission-line geometry in this galaxy.

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