The AGN Component in Deep Radio Fields: Current Understanding - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: The present paper reviews our current understanding of the AGN component insub-mJy radio fields, as it results from the exploitation of multi-frequencyinformation available in two deep extra-galactic radio fields: the ATESP 5 GHzsample and the First Look Survey. One of the key issues addressed here iswhether low-power AGNs are more related to efficiently accreting systemsmostly radio-quiet or to systems with very low accretion rates mostlyradio-loud. The emerging picture is the following. Radio-loud jet-dominatedradio galaxies seem to be largely dominant down to flux densities of the orderof e.g. S>400 microJy. At lower flux densities S1.4 GHz > 100 microJyradio-loud AGN are still present in significant numbers. However a populationof radio-emitting AGNs, whose properties are consistent with those expectedfrom existing radio-quiet AGN modeling, clearly shows up. This may indicatethat the bulk of the radio-quiet AGN population could emerge from studies ofdeeper S<100 microJy radio samples. The radio-quiet AGN component could berecognised thanks to the availability of IR colors which prove to be especiallyuseful to efficiently separate radio sources triggered by AGNs, from sourcestriggered by star-formation.



Autor: Isabella Prandoni

Fuente: https://arxiv.org/







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