Artículo
Spectral index variations of galactic emission
Fecha de publicación:
12/2004
Editorial:
Copernicus GmbH, Katlenburg-Lindau
Revista:
Proceedings of the Magnetized Interstellar Medium
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have used all-sky maps at 45 MHz, 408 MHz, 1420 MHz and 22.8 GHz to calculate the distribution of spectral indices across the sky. This requires an adjustment of the adopted zero-levels of the different surveys, which was performed by temperature-versus-temperature (TT) plots. While at high frequencies a spectral steepening with increasing Galactic latitude is seen in the same way as it is observed in nearby galaxies seen edge-on, the spectral index distribution is more complex at lower frequencies. In general there is an agreement with the cooling-convection halo models by Lerche & Schlickeiser (1982), but also local magnetic field variations and variations of the cosmic-ray electron energy spectrum may explain the distribution of low-frequency spectral indices.
Palabras clave:
Galactic Emission
,
Spectral Index
,
Surveys
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IAR)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Testori, Juan Carlos; Reich, Patricia; Reich, Wolfgang; Spectral index variations of galactic emission; Copernicus GmbH, Katlenburg-Lindau; Proceedings of the Magnetized Interstellar Medium; 1; 12-2004; 63-68
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