Correcting the Redshift Measurement of 4C15.05 Using Neutral Hydrogen
Abstract
4C15.05, (also known as PKS 0202+14 or J0204+15), is a quintessential blazar. It has a flat radio spectrum, a super-luminal jet and gamma-ray detections. Arecibo observations with the experimental 700-800 MHz receiver on the 305-m diameter William E. Gordon Telescope detected, serendipitously, HI in absorption against 4C15.05 while using it as a bandpass calibrator for another object in an HI absorption project. Although the redshift we derive is different to than that attributed to 4C15.05 by Perlman et al. (1998), it agrees very well with the value of z=0.833 determined by Stickel et al. (1996). We note that the erroneous value of z=0.405 has been extensively used in the literature.
- Publication:
-
American Astronomical Society Meeting Abstracts #229
- Pub Date:
- January 2017
- Bibcode:
- 2017AAS...22913707J