Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..884g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 279, Issue 3, pp. 884-898.
Astronomy and Astrophysics
Astronomy
21
Radiative Transfer, Galaxies: Individual: Iras F10214+4724, Galaxies: Individual: Iras 09104+4109, Galaxies: Individual: Ngc 1068, Galaxies: Starburst, Infrared: Galaxies
Scientific paper
Radiative transfer models are considered for the millimetre to near-infrared spectrum of IRAS F10214+4724. Models for dust emission in a starburst and from a flared disc Seyfert nucleus are compared with observations. It is found that starburst models can fit the mid-infrared upper limits only if the optical depth is very high (tau_uv>~200) or the maximum dust temperature is reduced to below ~500K. The very high optical depth starburst models cannot fit the 60-μm detection, and the models with lower maximum dust temperatures would be extended beyond the observed radio extent. The flared disc Seyfert models are incapable of providing the observed submillimetre emission, unless the discs are unfeasibly large. Both a starburst and a Seyfert disc of similar luminosity are therefore required to fit all the observations and the radio extent, with the starburst dominating the emission at wavelengths beyond ~60 mum. The models are consistent with a starburst region extending ~1h^-150 kpc (H_0=50h_50 km s^-1 Mpc^-1, Omega=1) with a gravitational lensing amplification of mu=10. They are not consistent with the far-infrared luminosity being produced from an ~80-pc-sized disc gravitationally lensed by a factor of M=50. The starburst models fitting the observations constrain the dust mass to (1.2-3.1)x10^8m^-110h^-250M_solar, and can be brought into agreement with the CO covering factor and density if there are 10-1000 star-forming regions. Composite starburst-AGN models are not required to fit observations of the hyperluminous galaxy IRAS 09104+4109. A flared disc Seyfert model alone is sufficient to fit all the infrared observations of this galaxy.
Green Simon M.
Rowan-Robinson Michael
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