  Neutral hydrogen (HI) 21 cm absorption has been detected against more and
more powerful radio jets. In this work, based on the Guppta et al. 2006a
sample, we present our preliminary study of the correlations between the HI
column density N(HI) and the jet power, N(HI) versus the low frequency
luminosity at 408MHz, and N(HI) versus the radio luminosity at 1400MHz.

High Energy Astrophysical Phenomena