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The ATLBS (left) and GLEAM (right) views of four square degrees of the radio sky. Combining the high resolution ATLBS data with the spectral “radio colour” of GLEAM will uncover the history of the AGN in the field.

The ATLBS (left) and GLEAM (right) views of four square degrees of the radio sky. Combining the high resolution ATLBS data with the spectral “radio colour” of GLEAM will uncover the history of the AGN in the field.

The Murchison Widefield Array (MWA) is a low frequency (80 — 300 MHz) radio telescope operating in Western Australia and the only SKA_Low precursor telescope. One of the largest science programs for the MWA is the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, which has surveyed the entire visible sky for two years since the MWA commenced operations.
Given the steep negative power-law spectra of synchrotron emission from radio galaxies, the low operational frequencies of the MWA are well-suited to detect and image relic lobes and hence past activity associated with active galactic nucleii. This project would use the GLEAM survey data in conjunction with higher-resolution imaging to construct a more complete picture of the activity history of AGN.
The exquisitely imaged and characterised sky region covered by the 1.4 GHz Australia Telescope Low Brightness Survey (ATLBS; Subrahmanyan et al. 2010; Saripalli et al, 2012) will be used for this exercise. In addition to the well-imaged and well-characterized information in the radio, the survey region also has available deep optical imaging and spectral data. Combining structural information from the high-resolution images of ATLBS radio sources with the well-separated low-frequency data from the GLEAM survey would render an effective method not only for discovering past activity phases of radio galaxies but also activity history as a function of source type. This project would suit an organised student interested in astrophysics and radio astronomy.