Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-22
Astronomy and Astrophysics
Astrophysics
12 pages, 8 figures
Scientific paper
10.1086/306175
We present an analysis of simultaneous multifrequency measurements of the Galactic emission in the 1-10 GHz range with 18 degrees, angular resolution taken from a high altitude site. Our data yield a determination of the synchrotron spectral index between 1.4 GHz and 7.5 GHz of 2.81 +/- 0.16. Combining our data with the maps from Haslam et al. (1982) and Reich & Reich (1986) we find 2.76 +/- 0.11 in the 0.4 - 7.5 GHz range. These results are in agreement with the few previously published measurements. The variation of spectral index with frequency based on our results and compared with other data found in the literature suggests a steepening of the synchrotron spectrum towards high frequencies as expected from theory, because of the steepening of the parent cosmic ray electron energy spectrum. Comparison between the Haslam data and the 19 GHz map (Cottingham 1987) also indicates a significant spectral index variation on large angular scale. Addition quality data are necessary to provide a serious study of these effects.
Amici G. de
Bensadoun Marc
Bersanelli Marco
Kogut Alan
Levin Sergey
No associations
LandOfFree
A Determination of the Spectral Index of Galactic Synchrotron Emission in the 1-10 GHz range does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Determination of the Spectral Index of Galactic Synchrotron Emission in the 1-10 GHz range, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Determination of the Spectral Index of Galactic Synchrotron Emission in the 1-10 GHz range will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-671437