Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..303r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 303-312.
Astronomy and Astrophysics
Astrophysics
37
Galactic Nuclei, Milky Way Galaxy, Nonthermal Radiation, Radio Spectra
Scientific paper
The distribution of the spectral index in the Galactic centre region has been studied using calibrated maps in the frequency range between 843 MHz and 43.25 GHz. The common angular resolution at three well separated frequencies was 1arcmin.5 which corresponds to 3.7 pc at the Galactic centre distance of 8.5 kpc. It is found that flat or slightly inverted spectra are seen in the "Arc" and the "Bridge" region north of Sgr A. After performing a thermal/nonthermal separation it is found that most of the nonthermal emission must have a positive spectrum with α ≡ +0.3 (S ≡ v+α). This unusual emission may be due to electrons with a monoenergetic or low-energy cutoff spectrum. The origin of these particles may be the compact radio source Sgr A* with the same spectral characteristics.
Reich Wolfgang
Seiradakis John H.
Sofue Yoshiaki
Wielebinski Richard
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