Origin of the IR continuum in the Circinus galaxy.

Details Origin of the IR continuum in the Circinus galaxy. Origin of the IR continuum in the Circinus galaxy.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..450s&link_type=abstract

Astronomy and Astrophysics, v.325, p.450-456

Astronomy and Astrophysics

Astrophysics

28

Galaxies: Individual: Circinus, Infrared: Galaxies, Infrared: Ism: Continuum, Dust, Extinction

Scientific paper

We present infrared and millimeter-wave observations of the Circinus galaxy which is at a distance of only 4 Mpc and provides the closest example of an obscured Seyfert nucleus surrounded by a starburst ring. The FWHM size of the continuum emission is found to be only =~0.3" (6pc) at 3-5μm, =~1.3" at 10μm, <=1.5" at 20μm and <=23" (460pc) at 1.3mm. The 1.3mm measurements also provide an estimate of =~1.6x10^8^Msun_ for the gas mass. It is shown using a radiative transfer code that both the observed sizes and overall spectral energy distribution, including the 9.7μm silicate absorption and 3.28-11.3μm PAH emission features, can be satisfactorily modelled by assuming that the total luminosity is dominated by dust heated by a central power law source.

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