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The relation between the radio emission of the core and host galaxy properties in Fanaroff–Riley type II radio galaxies

Published online by Cambridge University Press:  10 May 2022

F. Mazoochi Open the ORCID record for F. Mazoochi [Opens in a new window] ,
H. Miraghaei  and
N. Riazi
F. Mazoochi
Affiliation:
Department of Physics, Shahid Beheshti University, Tehran, Iran
H. Miraghaei*
Affiliation:
Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), University of Maragheh, Maragheh, Iran
N. Riazi
Affiliation:
Department of Physics, Shahid Beheshti University, Tehran, Iran
*
Corresponding author: H. Miraghaei, email: h.miraghaei@maragheh.ac.ir
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Abstract

We study the radio power of the core and its relation to the optical properties of the host galaxy in samples of high-excitation (HERG) and low-excitation (LERG) Fanaroff–Riley type II (FRII) radio galaxies. The radio galaxy sample is divided into two groups of core/non-core FRII, based on the existence of strong, weak or lack of single radio core component. We show that FRII LERGs with radio emission of the core have significantly higher [O III] line luminosities compared to the non-core LERG FRIIs. There is no significant difference between the hosts of the core and non-core FRIIs of LERG type in galaxy sizes, concentration indices, star formation rates, 4000-Å break strengths, colours, black hole masses, and black hole to stellar masses. We show that the results are not biased by the stellar masses, redshifts, and angular sizes of the radio galaxies. We argue that the detection of higher [O III] luminosities in the core FRIIs may indicate the presence of higher amounts of gas, very close to the active galactic nuclei (AGN) nucleus in the core FRIIs compared to the non-core FRIIs or may result from the interaction of the radio jets with this gas. The core and non-core FRIIs of the HERG type show no significant differences perhaps due to our small sample size. The effect of relativistic beaming on the radio luminosities and the contribution of restating AGN activity have also been considered.

Keywords

galaxies: activegalaxies: jetsradio continuum: galaxiesgalaxies: nuclei
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 39 , 2022 , e021
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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