Compact Symmetric Source 4C31.04

Minimum credit line: Image courtesy of NRAO/AUI and Gabriele Giovannini, et al.(for details, see Image Use Policy).

About this Image

Compact Symmetric Sources (CSOs) are small sources with lobe emission on both sides of an active core. They are very similar to classical extended radio sources but have a much smaller linear size, less than 1 kiloparsec. The study of these objects is particularly interesting because the CSO properties are related to the young source ages, 10,000 to 100,000 years. Unifying evolutionary models have been proposed whereby CSOs evolve into CSS (Compact Steep Spectrum) sources and then into Fanaroff-Riley type II galaxies or possibly Fanaroff-Riley type I radio galaxies. 4C31.04 is a nearby CSO (at a redshift z = 0.0592) with a faint central core and a flat spectrum and two extended lobes.

Investigator(s):  Gabriele Giovannini, et al.

Alternate Resolutions Help

This image is available in the following downloadable versions:If you would like to obtain a higher resolution version of this image, please contact us.

For More Information

Technical Data

    Telescope VLBA 
    Date of Observation 1992-01-30 
    Type of Observation Continuum Observations 
    Band C 
    Wavelength 6 cm 
    Frequency 5.0 GHz 
    Center of Image RA: 01:19:35.00, Dec: 32:10:50.10 (J2000)  
    Technical Caption  

  • Astronomical database entries for 4C31.04
    • Query NED for images of 4C31.04
    • Query SIMBAD for more 4C31.04 data


To search the Image Gallery for other images of 4C31.04, click the Submit button.
Object Name Show Results As:

To search the Image Gallery for similar images, click the Submit button.
Category Sub-Category Telescope Mode Show Results As:

For more search options, please use our Advanced Search form.