Extragalactic Astronomy at Low Frequencies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Low-frequency (ν ⪉ 100 MHz) observations have been hindered by low angular resolution, poor astrometry, low bandwidth, high noise temperature, strong confusion by sources in the field of view, and troublesome ionospheric phase errors. Consequently the decade of frequency between 10 and 100 MHz accessible from the ground remains largely unexplored. It offers unique scientific opportunities for serendipity (e.g., discovering coherent sources) as well as for studying very old radio sources in galaxies, mergers, and clusters, high-redshift galaxies, the relativistic electrons responsible X-ray sources powered by inverse-Compton scattering off the cosmic microwave background, radio source energetics, intrinsic properties of sources unaffected by relativistic beaming, and ionized gas in normal spiral galaxies via free-free absorption.

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