The link between IRAS spectra and near-infrared emission features in external galaxies

Details The link between IRAS spectra and near-infrared emission features in external galaxies The link between IRAS spectra and near-infrared emission features in external galaxies

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..227d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 2, Nov. 1988, p. 227-236.

Astronomy and Astrophysics

Astronomy

28

Active Galactic Nuclei, Emission Spectra, Infrared Astronomy Satellite, Near Infrared Radiation, Seyfert Galaxies, Color-Color Diagram, Cyclic Hydrocarbons, Star Formation, X Rays

Scientific paper

The relationship in external galaxies between the presence of the near-infrared (NIR) emission features attributed to polycyclic aromatic hydrocarbon (PAH) molecules, and the far-infrared (FIR) properties as observed by IRAS, is investigated. It is found that whenever the NIR features are absent in a galaxy, the FIR spectrum displays an enhancement at shorter wavelengths relative to normal galaxies. This enhancement is always associated with a strong activity in the galactic nucleus. Some Seyfert galaxies do not exhibit such an infrared signature and therefore they are probably energetically dominated by star-formation processes. Finally, the importance of hard UV photons and of the hot medium in the narrow line region of active nuclei is emphasized in relation to the survival of the PAH molecules. In this frame, the absence of PAHs in the galactic center could be taken as evidence for the presence of an active nucleus.

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