Journal
ASTRONOMY & ASTROPHYSICS
Volume 525, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200913628
Keywords
Galaxy: structure; radio continuum: ISM; radiation mechanisms: non-thermal; ISM: magnetic fields; cosmic rays
Categories
Funding
- Centro de Astrofisica FONDAP [15010003]
- Center of Excellence in Astrophysics and Associated Technologies [PFB 06]
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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 degrees. 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.
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