Spectral index distribution over radio lobes of 4C 14.11 using astrophysical data in FITS format

TL;DR

This study analyzes the flux and spectral index distribution of the FR II radio galaxy 4C 14.11 using multi-frequency astrophysical data, revealing insights into its non-thermal emission and age-related spectral properties.

Contribution

It provides the first detailed spectral index mapping of 4C 14.11's lobes using publicly available data at multiple frequencies.

Findings

Non-thermal synchrotron radiation dominates the lobes.

Spectral index differences between hot spots and lobes are minimal.

Inner lobes exhibit flat spectral indices, indicating an old AGN.

Abstract

The goal of this paper is to investigate the flux and spectral index distribution of FR II radio galaxy 4C 14.11. We focused on the distribution of flux and spectral indices over the lobes, as well as in their hot spots. For that purpose, we used publicly available observations of this radio galaxy given at 1450 and 8440 MHz. Particularly, we used Leahy's Atlas of radio-emitting double radio sources, Jodrell Bank Centre for Astrophysics in Manchester, as well as NASA/IPAC Extragalactic Database. We found that the non-thermal (synchrotron) radiation dominates over the areas of the lobes. Distinction between hot spots and rest of the lobes are much smaller in the spectral index than in the flux. We also found that over the inner parts of both lobes, spectral index $\alpha$ is flat in average and significantly higher than 1.2, indicating that 4C 14.11 is old AGN.