Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at $z=1.2230$ towards TXS1954+513

J. N. H. S. Aditya, Nissim Kanekar, J. Xavier Prochaska +3

We have used the 610 MHz receivers of the Giant Metrewave Radio Telescope (GMRT) to detect associated HI 21cm absorption from the $z=1.2230$ blazar TXS1954+513. The GMRT HI 21cm…