Sagittarius A & Halo

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About this Image

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.

Investigator(s):  W. M. Goss, K. R. Anantharamaiah, R. D. Ekers, and A. Pedlar

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Technical Data

    Telescope VLA 
    Date of Observation 1987-00-00 
    Type of Observation Continuum Observations 
    Band P 
    Wavelength 90 cm 
    Frequency 330 MHz 
    Center of Image RA: 17:43:15.00, Dec: -28:52:0.00 (J2000)  
    Field of View 0.2167 x 0.2167 degrees  
    Technical Caption VLA in A,B,C,D configuration using 15 antennas. Angular resolution is 12" x 12".  

  • Astronomical database entries for Sgr A
    • Query SIMBAD for more Sgr A data


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