Clustering of Extragalactic Sources from 151 MHz to 232 MHz: Implications for Cosmological 21-cm Observations

Understand

In order to construct accurate point sources simulations at the frequencies relevant to 21-cm experiments, the angular correlation of radio sources must be taken into account.

• This paper presents a measurement of angular two-point correlation function, w(\theta), at 232 MHz from the MIYUN survey - tentative measurements of w(\theta) are also performed at 151 MHz.
• It is found that double power law with shape w(\theta) = A \theta^{-\gamma} fits the 232 MHz data well.
• For the angular lenght of 0.2 degrees < \theta < 0.6 degrees, \gamma ~ -1.12, and this value of slope is independent of the flux-density threshold; while for angular lenghts much greater than 0.6 degrees, \gamma has a shallower value of about -0.16.