Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..902a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 278, No. 4, p. 902 - 918
Astronomy and Astrophysics
Astronomy
41
Galaxies: Active -- Galaxies: Nuclei -- Galaxies: Photometry -- Galaxies: Seyfert -- Galaxies: Stellar Content -- Infrared: Galaxies, Seyfert Galaxies: Infrared Photometry, Seyfert Galaxies: Infrared Continuum, Seyfert Galaxies: Radiation Mechanisms, Seyfert Galaxies: Stellar Populations, Seyfert Galaxies: Interstellar Dust
Scientific paper
The authors present results from a near-infrared (1-3.5 μm) study of an optically selected sample of Seyfert 2 galaxies. These images, taken through J, H, K and L filters, are used to measure magnitudes and colours for a range of projected apertures. The origin of the near-infrared continuum of Seyfert galaxies is still a matter of debate, although it is generally believed to be a mixture of stellar light and reradiation by hot dust, modified by extinction effects. The authors have deconvolved the surface brightness profiles of the Seyfert 2s into a combination of a nuclear source, a bulge component and a disc component. These results confirm that the stellar component dominates the emission from the central regions of Seyfert 2 nuclei at J, H and K wavelengths, even for the smallest apertures. However, at L band the non-stellar component within a 3-arcsec aperture accounts for between 50 and 90 per cent of the total emission. The authors compare these results with those for a small sample of Seyfert 1 galaxies. The near-infrared properties of the host galaxies have been studied by comparison with those of Seyfert 1 galaxies and low-redshift PG quasars. No strong differences have been found between the extra-nuclear colours in both classes of Seyfert galaxy, and low-redshift PG quasars. The host galaxy colours are consistent with those of a normal stellar population plus a warm dust component. There is a good correlation between the AGN luminosity (represented by the [O III] λ5007 line luminosity) and the K-band host galaxy luminosity for Seyferts and low-redshift PG quasars.
Alonso-Herrero Almudena
Kotilainen Jari K.
Ward Martin J.
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