2010/04/19 by A. de Oliveira‐Costa, Angelica de Oliveira-Costa, Joseph Lazio +2
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Radio Astronomy Observations and Technology #astro-ph.CO
paper · pdf · doi:10.48550/arxiv.1004.3167
5 pages, 4 figures, 1 table.
arxiv created 2010/04/19 · openalex publication_date 2010/04/19 · arxiv updated 2010/04/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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(θ), at 232 MHz from the MIYUN survey - tentative measurements of w(θ) are also performed at 151 MHz. It is found that double power law with shape w(θ) = A θ-γ fits the 232 MHz data well. For the angular lenght of 0.2 degrees < θ< 0.6 degrees, γ~ -1.12, and this value of slope is independent of the flux-density threshold; while for angular lenghts much greater than 0.6 degrees, γhas a shallower value of about -0.16. By comparing the results of this paper with previous measurements of w(θ), it is discussed how w(θ) changes with the change of frequency and completness limit.