Scans across Sagittarius A at 1.38 cm

In 1983 six drift curves across the radio source Sgr A at about 10-arcsec resolution were recorded with the RATAN-600 at 1.38 cm. The 'arms' of the miniature spiral configuration detected with the VLA (Ekers et al., 1983) are unresolved at this wavelength, perhaps because of the rather intense diffuse radiation within about 1 arcmin of the point radio source. Other structures, however, are well discriminated: the nonthermal source Sgr A East, a strong 7-arcmin nonthermal halo symmetric about the Sgr A West radio peak, and the flat-spectrum 'tongue' or 'arc' recorded previously. Several small-scale features, presumably compact H II regions, occur adjacent to Sgr A West and East. The nonthermal radiation predominating at 1.38 cm might be emitted by relativistic electrons in an intense stellar radiation field in the galactic nucleus.