Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3..155d&link_type=abstract
Experimental Astronomy, vol. 3, no. 1-4, p. 155-156
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Astronomical Spectroscopy, Emission Spectra, Galactic Radiation, Galaxies, H Ii Regions, Infrared Astronomy, Infrared Spectra, Molecular Spectroscopy, Star Formation, Polycyclic Aromatic Hydrocarbons, Seyfert Galaxies
Scientific paper
The origin of the IR emission in Infrared Astronomy Satellite (IRAS) galaxies, particularly in the ultraluminous ones, is still a quesion of debate: both star formation and an active nucleus could contribute. While the former could be extended and have a significant contribution from the disk, the later should be centrally concentrated. However, a centrally peaked emission in itself does not rule out star formation, as evidences now accumulate for high rates and efficiency of star formation in the central regions of such galaxies, often described as mergers (e.g. Sanders et al. 1991). On the other hand, the 12 micrometer IRAS flux is essentially due to radiation from polycyclic aromatic hydrocarbon (PAH) molecules. These molecules are easily destroyed in high energy-density environments and it is therefore expected that the 10 micrometer emission could show a depression close to an active nucleus (Desert and Dennefeld, 1988). Knowledge of the distribution of the emission, not provided by IRAS, but now accessible from the ground with high angular resolution, is therefore essential. We present below preliminary results from such a program.
Dennefeld Michel
Desert François Xavier
Lagage Pierre Olivier
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