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Modelling the Spectral Energy Distribution of Compact Luminous Infrared Galaxies: Constraints from High Frequency Radio Data | | O.R. Prouton
; A. Bressan
; M. Clemens
; A. Franceschini
; G.L. Granato
; L. Silva
; | | Date: |
24 Mar 2004 | | Journal: | Astron.Astrophys. 421 (2004) 115-127 | | Subject: | astro-ph | | Affiliation: | 2,3), M. Clemens , A. Franceschini , G.L. Granato (2,3), L. Silva (Dipartimento di Astronomia, Padova, Italy, INAF, Osservatorio Astronomico di Padova, Italy, SISSA, Trieste, Italy INAF, Osservatorio Astronomico di Trieste, Italy | | Abstract: | We have performed 23 GHz VLA observations of 7 compact, luminous infrared galaxies, selected to have evidence of starburst activity. New and published multi-frequency data are combined to obtain the spectral energy distributions of all 7 galaxies from the near-infrared to the radio (at 1.4 GHz). These SEDs are compared with new models, for dust enshrouded galaxies, which account for both starburst and AGN components. In all 7 galaxies the starburst provides the dominant contribution to the infrared luminosity; in 4 sources no contribution from an AGN is required. Although AGN may contribute up to 50 percent of the total far--infrared emission, the starbursts always dominate in the radio. The SEDs of most of our sources are best fit with a very high optical depth of (>=50) at 1 micron. The scatter in the far-infrared/radio correlation, found among luminous IRAS sources, is due mainly to the different evolutionary status of their starburst components. The short time-scale of the star formation process amplifies the delay between the far-infrared and radio emission. This becomes more evident at low radio frequencies (below about 1 GHz) where synchrotron radiation is the dominant process. In the far-infrared (at wavelengths shorter than 100 micron) an additional source of scatter is provided by AGN, where present. AGN may be detected in the near-infrared by the absence of the knee, typical of stellar photospheres. However, near-infrared data alone cannot constrain the level at which AGN contribute because the interpretation of their observed properties, in this wave-band, depends strongly on model parameters. | | Source: | arXiv, astro-ph/0403581 | | Services: | Forum | Review | PDF | Favorites | |
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