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The nuclear 10 micron emission of spiral galaxies
Giuricin, Giuliano; Tamburini, Laura; Mardirossian, Fabio; Mezzetti, Marino; Monaco, Pierluigi
AA(Scuola Internanazionale Superiore di Studi Avanzati, Trieste, Italy), AB(Scuola Internanazionale Superiore di Studi Avanzati, Trieste, Italy), AC(Scuola Internanazionale Superiore di Studi Avanzati, Trieste, Italy), AD(Scuola Internanazionale Superiore di Studi Avanzati, Trieste, Italy), AE(Scuola Internanazionale Superiore di Studi Avanzati, Trieste, Italy)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 202-220 (ApJ Homepage)
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NASA/STI Keywords:
Active Galactic Nuclei, Infrared Astronomy, Interacting Galaxies, Light (Visible Radiation), Photometry, Quasars, Seyfert Galaxies, Spiral Galaxies, Star Formation, Statistical Analysis, X Rays, Algorithms, Astronomical Catalogs, Emission Spectra, Hubble Constant, Infrared Astronomy Satellite, Interstellar Matter, Luminosity, Radio Emission, Wavelengths
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We examine the 10 micrometer(s) emission of the central regions of 281 spiral galaxies, after having compiled all ground-based, small-aperture (approximately 5 sec) broad-band photometric observations at lambda approximately 10 micrometer(s) (N magnitudes) published in the literature. We evaluate the compactness of the approximately 10 micrometer(s) emission of galaxy nuclei by comparing these small-beam measures with the large-beam IRAS 12 micrometer(s) fluxes. In the analysis of different subsets of objects, we apply survival analysis techniques in order to exploit the information contained in 'censored' data (i.e., upper limits on the fluxes). Seyfert galaxies are found to contain the most powerful nuclear sources of mid-infrared emission, which in approximately one-third of the cases provide the bulk of the emission of the entire galaxy; thus, mid-infrared emission in the outer disk regions is not uncommon in Seyfert galaxies. The 10 micrometer(s) emission of Seyfert galaxies appears to be unrelated to their X-ray emission. H II region-like nuclei are stronger mid-infrared sources than normal nuclei and LINER nuclei (whose level of emission is not distinguishable form that of normal nuclei). Interacting objects have, on average, greater 10 micrometer(s) luminosities than noninteracting ones and exhibit more compact emission. Early-type spirals have stronger and more compact 10 micrometer(s) emisison than late-type ones. Barred spirals are brighter at approximately 10 micrometer(s) than unbarred systems, essentially because they more frequently contain H II retion-like nuclei. The results of our detailed comparison between the behavior of various categories of objects stress that the 10 micrometer(s) emission of spiral nuclei is closely linked to the (predominantly nonthermal synchrotron) radio emission.

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