PASS Scripta Varia 21 - Pontifical Academy of Sciences

TABLES • G. SWARUP
Figure 1. A radio map of the Quasar 3C175 made by Bridle et al. [16] with a resolution of 0.35 arcsec,
using the Very Large Array (VLA), showing a central compact radio source coincident with an
optical galaxy at a redshift z =0.768, a jet of radio emission on one side (most likely towards the
observer) and the two outer radio lobes. The lobes occur as the relativistic plasma ejected by the
central active galactic nuclei in two opposite directions suffers shock by the intergalactic medium.
The overall linear size of 3C175 is about 1 million light years.
The Scientific Legacy of the 20 th Century
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