Subtraction of Bright Point Sources from Synthesis Images of the Epoch of Reionization - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Bright point sources associated with extragalactic AGN and radio galaxies arean important foreground for low frequency radio experiments aimed at detectingthe redshifted 21cm emission from neutral hydrogen during the epoch ofreionization. The frequency dependence of the synthesized beam implies that thesidelobes of these sources will move across the field of view as a function ofobserving frequency, hence frustrating line-of-sight foreground subtractiontechniques. We describe a method for subtracting these point sources from dirtymaps produced by an instrument such as the MWA. This technique combines matchedfilters with an iterative centroiding scheme to locate and characterize pointsources in the presence of a diffuse background. Simulations show that thistechnique can improve the dynamic range of EOR maps by 2-3 orders of magnitude.



Autor: B. Pindor, J. S. B. Wyithe, D. A. Mitchell, S. M. Ord, R. B. Wayth, L. J. Greenhill

Fuente: https://arxiv.org/







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