All-sky Galactic radiation at 45 MHz and spectral index between 45 and 408 MHz

Abstract

Aims: We study the Galactic large-scale synchrotron emission by generating a reliable all-sky spectral index map and temperature map at 45 MHz. Methods: We use our observations, the published all-sky map at 408 MHz, and a bibliographical compilation to produce a map corrected for zero-level offset and extragalactic contribution. Results: We present full sky maps of the Galactic emission at 45 MHz and the Galactic spectral index between 45 and 408 MHz with an angular resolution of 5\degs. The spectral index varies between 2.1 and 2.7, reaching values below 2.5 at low latitude because of thermal free-free absorption and its maximum in the zone next to the Northern Spur.

A&A accepted

References in corpus (4)

• Radio observational constraints on Galactic 3D-emission models
• A New Model For The Loop-I (The North Polar Spur) Region
• The Turbulent Warm Ionized Medium: Emission Measure Distribution and MHD Simulations
• The contribution of the Unresolved Extragalactic Radio Sources to the Brightness Temperature of the sky

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