Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446..550g&link_type=abstract
Astrophysical Journal v.446, p.550
Astronomy and Astrophysics
Astronomy
34
Galaxies: Active, Galaxies: Nuclei, Galaxies: Seyfert, Infrared: Galaxies
Scientific paper
We examine the 10 microns emission of the central regions of 117 Seyfert galaxies, after having compiled all the ground-based, small aperture (˜5") photometric observations at λ ˜ 10 microns (N-magnitudes) published in the literature. We also evaluate the compactness of the 10 microns emission through a comparison of these small-beam measures with the large beam IRAS 12 microns fluxes. We apply survival analysis statistical techniques in order to exploit the information contained in "censored" data (i.e., upper limits on fluxes).
Seyfert galaxies appear to have more compact and powerful central 10 microns emission than non-Seyfert galaxies have. Interactions do not affect appreciably the 10 microns emission of Seyfert galaxies. Their 10 microns emission, which is quite weakly related to the X-ray emission, correlates well with the nuclear non-stellar near-infrared emission and with the IRAS 12 and 25 microns band emissions, less well with the IRAS 60 microns emission and even worse with the IRAS 100 microns emission. The 100 microns to 25 microns global energy distribution flattens systematically with increasing 10 microns luminosity. Seyferts 1 have, on average, greater 10 microns luminosity than S2 have, but similar surface brightness and compactness. Seyferts 2 have steeper continuum spectra between 12 and 25 microns than Seyferts 1 have.
Our results favour thermal dust emission models for the origin of the mid-infrared emission of Seyfert galaxies. Within the context of unified schemes of Seyfert galaxies, our findings support the presence of a moderate amount of anisotropy in the 10 microns emission and are consistent with the presence of Thomson optically thin obscuring dust tori around Seyfert nuclei.
Giuricin Giuliano
Mardirossian Fabio
Mezzetti Marino
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