Gravitationally Lensed Quasar

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About this Image

This remarkable image is the result of a gravitational lens, an intervening body massive enough to form multiple images of a distant quasar, by the gravitational deflection of light. Two images of the quasar are seen in this radio map - the A image is the bright point-like image north of center, and the B image is the bright point-like image south of center. The weak image just north of the B image coincides with the center of a large galaxy observed in the optical, which, along with the rich cluster of galaxies it lies in, is believed to be acting as the gravitational lens. The rest of the images seen in the map are due to extended radio emission associated with the quasar which have not been multiply imaged. The colors represent the intensity of the radio emission - red is bright, and blue is dim.

Investigator(s):  P. E. Greenfield, D. H. Roberts, and B. F. Burke

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Technical Data

    Telescope VLA 
    Date of Observation 1979-10-13 
    Type of Observation Continuum Observations 
    Band C 
    Wavelength 6 cm 
    Frequency 4.885 GHz 
    Center of Image RA: 10:01:20.86, Dec: 55:53:49.90 (J2000)  
    Field of View 0.0053 x 0.0053 degrees  
    Technical Caption VLA in hybrid configuration using 18 antennas. Resolution is 0.8 x 0.4 arcsec.  

  • Astronomical database entries for RGB J1001 558B
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