Serendipitous Detection of HI Absorption Sets the True Redshift of 4C +15.05 to $z=0.833$

Kristen M. Jones, Tapasi Ghosh, Chris J. Salter

4C+15.05, (also known as NRAO 91, PKS 0202+14 or J0204+15), is a quintessential blazar. It has a luminous, variable radio spectrum, a super-luminal jet, and gamma-ray detections. A…