Context : Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy , though the details are still unclear .

Aims : Here we explore the pattern of recent star formation in the central region of the post-merger galaxy NGC7252 using high resolution UV images from the UVIT on ASTROSAT .

Methods : The UVIT images with 1.2 and 1.4 arcsec resolution in the FUV and NUV are used to construct a FUV-NUV colour map of the central region .

Results : The FUV–NUV pixel colour map for this canonical post-merger galaxy reveals a blue circumnuclear ring of diameter \sim 10 ” ( 3.2 kpc ) with bluer patches located over the ring .
Based on a comparison to single stellar population models , we show that the ring is comprised of stellar populations with ages \lesssim 300 Myr , with embedded star-forming clumps of younger age ( \lesssim 150Myr ) .

Conclusions : The suppressed star formation in the central region , along with the recent finding of a large amount of ionised gas , leads us to speculate that this ring may be connected to past feedback from a central super-massive black hole that has ionised the hydrogen gas in the central \sim 4 ” \sim 1.3 kpc .