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

Mazoochi, F.; Miraghaei, H.; Riazi, N.

doi:10.1017/pasa.2022.15

Cited by 3 publications

(3 citation statements)

References 79 publications

(112 reference statements)

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“…The lack of correlation could be due to the uncertainties exposed by AGN duty cycles. The result is also consistent with the result from Mazoochi et al (2022) for the core and noncore FRIIs. They showed that FRIIs with luminous radio core have on average higher [O III] luminosity than noncore or weak-core FRIIs.…”

Section: Relation Between [Oiii] Luminosity and Radio Properties Of Agnsupporting

confidence: 91%

“…Core radio emissions have also been investigated for the extended sources (Baldi et al 2015(Baldi et al , 2019. Mazoochi et al (2022) investigate core and total radio emissions for a sample of FRII radio galaxies. They show that there is a correlation for FRII LERGs and HERGs when total radio luminosity has been considered.…”

Section: Relation Between [Oiii] Luminosity and Radio Properties Of Agnmentioning

confidence: 99%

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A Statistical Analysis on the Morphology and Color of Galaxies Hosting Radio-loud Active Galactic Nuclei

Miraghaei

2022

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The properties of galaxies hosting radio-loud active galactic nuclei (AGN) have been investigated in order to find out the relation between morphology and color of galaxies and radio loudness. The concentration index is used to map the morphology of galaxies as early or late type. 4000 Å break strength and star-formation rate are used to quantify the state of galaxies as blue star forming or red quenched. Due to the environmental dependence of these properties, galaxies with the same environment have been considered. The results show that the prevalence of radio-loud AGN in early-type galaxies is independent of environment. This is confirmed by comparing a sample of galaxies hosting radio-loud AGN with a sample of galaxies hosting radio-quiet AGN or with a randomly selected galaxy sample from the total population of galaxies used in this study. In addition, it is shown that galaxies hosting radio-loud AGN are bluer indicating the role of cold gas in triggering AGN activity. Finally, the optically-selected radio-loud AGN show to have higher [O iii] luminosities compared with their radio-quiet counterparts. We argue the relation between radio size and luminosity with the [O iii] luminosity.

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Section: Relation Between [Oiii] Luminosity and Radio Properties Of Agnsupporting

confidence: 91%

Section: Relation Between [Oiii] Luminosity and Radio Properties Of Agnmentioning

confidence: 99%

A Statistical Analysis on the Morphology and Color of Galaxies Hosting Radio-loud Active Galactic Nuclei

Miraghaei

2022

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“…To correct this effect, we need to find the contribution of beamed sources, which is different in each catalog. Mazoochi et al (2022) have discussed it for a sample of FRIIs selected from the catalog provided by Miraghaei & Best (2017). They showed that even for the core of FRIIs (compact component), beamed sources constitute 6%-30% of the sample.…”

Section: Resultsmentioning

confidence: 99%

Morphological-based Analyses for Parameterizing Symmetry in Radio Galaxies

Javaherian,

Miraghaei,

Moradpour

2023

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The morphology of radio galaxies can provide significant clues to describe the formation and evolution of galaxies in the Universe. Here, we aim to extract the morphological parameters of radio galaxies and define symmetry criteria as some of the essential factors of their shape explanations. We employed 67 radio galaxies, which include Fanaroff–Riley type 1 and type 2 galaxies, and their radio images from the FIRST and LoTSS surveys. We developed an automatic segmentation process to extract morphological properties such as the size of objects, eccentricity, and orientation of segmented regions from data sets. Using a maximum likelihood estimator, we show that the distributions of sizes follow a power-law function with exponents of −0.39 ± 0.06 and −0.55 ± 0.05 for the FIRST and LoTSS data, respectively. We found that type 2 radio galaxies have slightly lower eccentricities than type 1. We studied the relationships between size, eccentricity, and redshift in scatter plots. The size of galaxies (kpc2) demonstrates gently growing trends with increasing eccentricity in their scatter plots. We discussed the possible effect of the redshifts of the galaxies on this result. Depending on the number of segmented regions, we defined symmetry criteria based on proximity to the center of a galaxy in the optical band, eccentricity, orientation, and the quarter (q) of appearance in the image. We found that the mean symmetry obtained for two segmented regions that mainly emerged in two quarters via the condition of ∣ q ′ − q ″ ∣ = 2 has a higher value than those obtained for other cases.

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On the Relation Between Symmetry of Radio Galaxies and Their Physical Parameters

Javaherian,

Miraghaei,

Moradpour

2024

Res. Astron. Astrophys.

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Gravity as a fundamental force plays a dominant role in the formation and evolution of cosmic objects and leaves its effect in the emergence of symmetric and asymmetric structures. Thus, analyzing the symmetry criteria allows us to uncover mechanisms behind the gravity interaction and understand the underlying physical processes that contribute to the formation of large-scale structures such as galaxies. We use a segmentation process using intensity thresholding and the $k$-means clustering algorithm to analyze radio galaxy images. We employ a symmetry criterion and explore the relation between morphological symmetry in radio maps and host galaxy properties. Optical properties (stellar mass, black hole mass, optical size (R$_{50}$), Concentration, stellar mass surface density ($\mu_{50}$), and stellar age) and radio properties (radio flux density, radio luminosity, and radio size) are considered. We found that there is a correlation between symmetry and radio size, indicating larger radio sources have smaller symmetry indices. Therefore, size of radio sources should be considered in any investigation of symmetry. Weak correlations are also observed with other properties, such as R$_{50}$ for FRI galaxies and stellar age. We compare the symmetry differences between FRI and FRII radio galaxies. FRII galaxies show higher symmetry in 1.4 GHz and 150 MHz maps. Investigating the influence of radio source sizes, we discovered that this result is independent of the sizes of radio sources. These findings contribute to our understanding of the morphological properties and analyzes of radio galaxies.

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

Cited by 3 publications

References 79 publications

A Statistical Analysis on the Morphology and Color of Galaxies Hosting Radio-loud Active Galactic Nuclei

A Statistical Analysis on the Morphology and Color of Galaxies Hosting Radio-loud Active Galactic Nuclei

Morphological-based Analyses for Parameterizing Symmetry in Radio Galaxies

On the Relation Between Symmetry of Radio Galaxies and Their Physical Parameters

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