A new approach to multi-frequency synthesis in radio interferometry

Abstract

We present a new approach to multi-frequency synthesis in radio astronomy. Using Bayesian inference techniques, the new technique estimates the sky brightness and the spectral index simultaneously. In principle, the bandwidth of a wide-band observation can be fully exploited for sensitivity and resolution, currently only limited by higher order effects like spectral curvature. Employing this new approach, we further present a multi-frequency extension to the imaging algorithm RESOLVE. In simulations, this new algorithm outperforms current multi-frequency imaging techniques like MS-MF-CLEAN.

13 pages, 5 fugures, submitted to Astronomy and Astrophysics

References in corpus (7)

• Multi-Scale CLEAN deconvolution of radio synthesis images
• Revisiting the radio interferometer measurement equation. I. A full-sky Jones formalism
• Revisiting the radio interferometer measurement equation. II. Calibration and direction-dependent effects
• Reconstruction of Gaussian and log-normal fields with spectral smoothness
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• RESOLVE: A new algorithm for aperture synthesis imaging of extended emission in radio astronomy
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