Modelling the infrared continuum of Centaurus A

Details Modelling the infrared continuum of Centaurus A Modelling the infrared continuum of Centaurus A

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..853a&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 853

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1

Active-Galaxies, Individual, Cen A, Nuclei-Galaxies, Galaxies-Radiative Transfer

Scientific paper

We present ISOPHOT-S, ISOSWS and 8 to 13μm ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that in a nuclear sized aperture (~4 arcsec, ~60 pc) the SED is characteristic of emission from a starburst and AGN torus; in larger apertures an additional component of cirrus emission is required. Based on our model, the torus diameter is estimated to be 3.6 pc and the best fitting inclination angle of the torus is 45 degrees. This result has implications for the detectability of tori in low power AGN and in particular for the use of the IRAS 60/25μm flux ratio as an indicator of the torus inclination.

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