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Date and Time of the Query: 2019-04-22 T15:44:11 PDT
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For refcode 1995ApJ...446..550G:
Retrieve 117 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1995ApJ...446..550G THE 10 MICRON EMISSION OF SEYFERT NUCLEI GIULIANO GIURICIN, FABIO MARDIROSSIAN, AND MARINO MEZZETTI Received 1994 February 17; accepted 1994 December 14 ABSTRACT We examine the 10 micron emission of the central regions of 117 Seyfert galaxies, after having compiled all the ground-based, small aperture (5") photometric observations at {lambda} ~ 10 microns (N- magnitudes) published in the literature. We also evaluate the compactness of the 10 micron emission through a comparison of these small-beam measures with the large beam IRAS 12 micron 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 micron emission than non-Seyfert galaxies have. Interactions do not affect appreciably the 10 micron emission of Seyfert galaxies. Their 10 micron 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 micron band emissions, less well with the IRAS 60 micron emission and even worse with the IRAS 100 micron emission. The 100 micron to 25 micron global energy distribution flattens systematically with increasing 10 micron luminosity. Seyferts 1 have, on average, greater 10 micron 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 micron emission and are consistent with the presence of Thomson optically thin obscuring dust tori around Seyfert nuclei. Subject headings:. galaxies: active - galaxies: nuclei galaxies: Seyfert - infrared: galaxies
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