3-7 July 2023
University of Zululand
Africa/Johannesburg timezone
The Proceedings of SAIP2023 Published: 20 December 2023

Star-forming galaxies and radio-active galactic nuclei in the faint radio sky

6 Jul 2023, 09:40
University of Zululand

University of Zululand

Oral Presentation Track D1 - Astrophysics Astrophysics & Space Science


Getrude Thando Mothogoane (University of Johannesburg)


Understanding the complex relationship between nuclear activity, star formation, and galaxy growth is crucial for disentangling the mechanisms driving galaxy evolution. This project investigates how nuclear activity regulates star formation and galaxy growth at higher redshifts (z > 1). We specifically explore the correlations between black hole accretion rate (BHAR), star formation rate (SFR), and stellar mass (M * ) in both star-forming galaxies (SFGs) and host galaxies of radio active galactic nuclei (AGN). Utilizing MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data from the COSMOS field, along with multiwavelength ancillary data, we aim to constrain the physical properties of SFGs and radio AGN host galaxies within a redshift range of 0 ≲ z ≲ 6. By analyzing the data, we determine the SFR, M * , and dust luminosity (L dust ) for these sources using spectral energy distribution (SED) fitting techniques. To achieve this, we compare the results obtained from four SED fitting codes: MAGPHYS (da Cunha et al. 2008), CIGALE (Noll et al. 2009), AGNfitter (Calistro et al. 2016), and MrMoose (Drouart et al. 2018). The comparison is made against physical properties derived from independent measurements. The goal is to select the SED fitting code that yields physically feasible results and performs well for very faint radio sources. By utilizing MeerKAT observations, multiwavelength data, and SED fitting techniques, this project aims to analyze the physical properties and investigate the correlations between nuclear activity, star formation, and
galaxy growth. The findings of this study will contribute to our understanding of the underlying physical mechanisms driving star formation and quenching across cosmic time.

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Primary author

Getrude Thando Mothogoane (University of Johannesburg)


Dr Sthabile Kolwa, Prof. Soebur Razzaque

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