7–11 Jul 2025
University of the Witwatersrand, Johannesburg
Africa/Johannesburg timezone
Registration open until 20 May 2025

The evolution of the 98 GHz ACT source population since z = 4.5

Not scheduled
2h 50m
Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Solomon Mahlangu House

University of the Witwatersrand, Johannesburg

Poster Presentation Track D1 - Astrophysics Poster Session

Speaker

Obakeng Phiri (Student)

Description

This research focuses on more than 15,000-millimetre wavelength sources observed using the Atacama Cosmology Telescope. These sources cover an area of approximately 18,000 square degrees and the ACT data observed at 98 GHz allows us to have a large population of AGNs at different redshift bands. This makes it possible to study the light these AGNs released at a redshift of up to 4.5, corresponding to the lookback time of about 11.9 Gyr. We also cross-matched the ACT data with radio data from RACS, MALS, VLASS, and FIRST surveys, enabling us to look at sources that other surveys could not detect (as the sources are faint). Also, we use redshift data from the Gaia-unWISE Quasar catalogue, which consists of spectrophotometric redshifts. We will look at luminosity functions for the number density of these sources at different redshift bands. We will fetch images from different wavelengths (radio, infrared, optical, and X-ray) to look at the environments and morphologies of these sources and see if they have common structures at different redshift bands.

Apply for student award at which level: MSc
Consent on use of personal information: Abstract Submission Yes, I ACCEPT

Primary author

Obakeng Phiri (Student)

Presentation materials

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