English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We extend 21CMMC, a Monte Carlo Markov Chain sampler of 3D reionisationsimulations, to perform parameter estimation directly on 3D light-cones of thecosmic 21cm signal. This brings theoretical analysis closer to the tomographic21-cm observations achievable with next generation interferometers like HERAand the SKA. Parameter recovery can therefore account for modes which evolvewith redshift/frequency. Additionally, simulated data can be more easilycorrupted to resemble real data. Using the light-cone version of 21CMMC, wequantify the biases in the recovered astrophysical parameters if we use the21cm power spectrum from the co-evolution approximation to fit a 3D light-conemock observation. While ignoring the light-cone effect under most assumptionswill not significantly bias the recovered astrophysical parameters, it can leadto an underestimation of the associated uncertainty. However significant biases($\sim$few -- 10 $\sigma$) can occur if the 21cm signal evolves rapidly (i.e.the epochs of reionisation and heating overlap significantly) and: (i)foreground removal is very efficient, allowing large physical scales($k\lesssim0.1$~Mpc$^{-1}$) to be used in the analysis or (ii) theoreticalmodelling is accurate to within $\sim10$ per cent in the power spectrumamplitude.

21CMMC with a 3D light-cone: the impact of the co-evolution approximation on the astrophysics of reionisation and cosmic dawn