Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441603m&link_type=abstract
American Astronomical Society, AAS Meeting #214, #416.03; Bulletin of the American Astronomical Society, Vol. 41, p.682
Astronomy and Astrophysics
Astronomy
Scientific paper
We present deep Spitzer mid-infrared spectroscopy, along with 16, 24, 70, and 850 mμ photometry, for 22 galaxies located in the Great Observatories Origins Deep Survey-North (GOODS-N) field.
The sample spans a redshift range of 0.625 mag) sources.
We find that infrared (IR; 8-1000 mμ) luminosities are overestimated by a factor of 5 in the redshift range between 1.4This result arises partly due to the fact that high redshift galaxies exhibit aromatic feature equivalent widths that are large compared to local galaxies of similar luminosities.
Using improved estimates for the IR luminosities of these sources, we investigate whether their infrared emission is found to be in excess relative to that expected based on extinction corrected UV star formation rates (SFRs), possibly suggesting the presence of an obscured AGN.
Through a spectral decomposition of mid-infrared spectroscopic data, we are able to isolate the fraction of IR luminosity arising from an AGN as opposed to star formation activity.
This fraction is only able to account for 30% of the total IR luminosity among the entire sample and 35% of the "excess" IR emission among these sources, on average, suggesting that AGN are not the dominant cause of the inferred "mid-infrared excesses" in these systems.
An inspection of the FIR-radio correlation shows no evidence for evolution over this redshift range.
However, we find that the SMGs have IR/radio ratios which are a factor of 3 lower, on average, than what is measured for star-forming galaxies in the local Universe.
Chary Ranga Ram
FIDEL Team
Murphy Eric J.
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