[Astro] Lunch Talk

[Michael Anderson Jennings]

Hi Everyone,

This week's lunch talk will be given by Jen, on Thursday at 1pm in A113. Title and abstract are below.


The Peculiar Velocity Effect in 21cm Lightcones



The 21cm brightness temperature during the Epoch of Reionisation is widely modelled using semi-numeric simulations. They are used for their computational speed and flexibility to test different astrophysical and cosmological parameters. However, these simulations often make assumptions in order to reduce computational costs. In particular the peculiar velocity effect is considered separately to lightcone effects. We highlight the importance of considering these effects in conjunction with each other. Especially when looking at the 1D power spectrum at large k scales. Here we see a boost in power of >300 % (>70%) in the Epoch of Reionisation (Cosmic Dawn), which is recoverable after the addition and removal of diffuse radio foregrounds and SKAO-like instrumental noise.

Thanks,
Mikey

Mikey Anderson Jennings
Astronomy PhD Student
University of Nottingham
Centre for Astronomy and Particle Theory

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