A New Radio Loudness Diagnostic for Active Galaxies: a Radio-To-Mid-Infrared Parameter - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




A New Radio Loudness Diagnostic for Active Galaxies: a Radio-To-Mid-Infrared Parameter - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We have studied the relationship between the nuclear high-resolution radioemission, at 8.4 GHz 3.6 cm and 1.4 GHz 20 cm, the O IV 25.89um, Ne III15.56um and Ne II 12.81um emission lines and the black hole mass accretionrate for a sample of Seyfert galaxies. In order to characterize the radiocontribution for the Seyfert nuclei we used the 8.4GHz-O IV ratio, assumingthat O IV scales with the luminosity of the AGN. From this we find thatSeyfert 1-s i.e., Seyfert 1.0-s, 1.2-s, and 1.5-s and Seyfert 2-s i.e.,Seyfert 1.8-s, 1.9-s, and 2.0-s have similar radio contributions, relative tothe AGN. On the other hand, sources in which the Ne II emission is dominatedeither by the AGN or star formation have statistically different radiocontributions, with star formation dominated sources more -radio loud-, by afactor of ~2.8 on average, than AGN dominated sources. We show that starformation dominated sources with relatively larger radio contribution havesmaller mass accretion rates. Overall, we suggest that 8.4GHz-O IV, oralternatively, 1.4GHz-O IV ratios, can be used to characterize the radiocontribution, relative to the AGN, without the limitation of previous methodsthat rely on optical observables.



Author: M. Meléndez, S.B. Kraemer, H.R. Schmitt

Source: https://arxiv.org/



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