Compact Symmetric Source 4C31.04

https://www.nrao.edu/archives/plugins/Dropbox/files/4c31large.jpg

Description

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.

Creator

Legacy Astronomical Images

Rights

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

Type

Legacy Astronomical Image

Object Name

4C31.04

Photo Credit

Gabriele Giovannini, et al.

Investigators

Gabriele Giovannini, et al.

Telescope

Very Long Baseline Array (VLBA)

Observation Date

1992-01-30

Type of Observation

continuum

Band

C

Wavelength

6 cm

Frequency

5.0 GHz

Center of Image

RA 1:19:35.000, Dec: 32:10:50.100 (J2000)

Link to journal article

Series

Active Galactic Nuclei Series

Unit

Radio Galaxies Unit

Citation

Legacy Astronomical Images, “Compact Symmetric Source 4C31.04,” NRAO Archives, accessed December 4, 2021, https://www.nrao.edu/archives/items/show/33362.