Sagittarius A & Halo

This is a pseudo-color representation of Sgr A and its halo at 90 cm (332 MHz). The coding of the brightness scale is indicated by the color bar. Sgr A East is a non-thermal shell source that could be a supernova remnant or a very low-luminosity example of a radio component associated with the active nucleus of a spiral galaxy. The most dramatic aspect of the new 332 MHz observations is the appearance of the Sgr A West spiral features in absorption against Sgr A East. Based on these results, Sgr A East is situated behind Sgr A West, the center of the galaxy. The halo is in front of or surrounds the former sources. The HII regions to the east of Sgr A East are probably associated with the 50 km/s molecular cloud. The 7 arcmin halo (20 pc) has a non-thermal spectrum with turn-over below 1 GHz.

VLA in A,B,C,D configuration using 15 antennas. Angular resolution is 12" x 12".

Legacy Astronomical Images

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Legacy Astronomical Image

Sgr A

W. M. Goss, K. R. Anantharamaiah, R. D. Ekers, A. Pedlar

Very Large Array (VLA)

1987-00-00

continuum

P

90 cm

330 MHz

RA 17:43:15.000, Dec: -28:52:0.000 (J2000)

0.216667 x 0.216667 degrees

Contact the archivist for a high resolution tif of this image.

Galactic Sources Series

Galactic Center Unit