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

Serendipitous Detection of Absorption Sets the True Redshift of 4C +15.05 to z = 0.833 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. Arecibo observations with the 700–800 MHz receiver on the 305 m diameter William E. Gordon Telescope detected, serendipitously, H i in absorption against 4C+15.05 while using it as a bandpass calibrator for another object in an H i absorption project. Although the redshift we derive is different from that commonly in use in the literature (nominally z = 0.405), it agrees very well with the value of z = 0.833 determined by Stickel et al. This absorption feature is best fitted by a sum of three Gaussians, which yield an average redshift of z = 0.8336 ± 0.0004, although without corresponding high-resolution imaging it is not possible to say whether the components are parts of outflows or inflows. A total column density of N(H i) = 2.39 ± 0.13 × 1021 cm−2 is derived, relatively high compared to many radio-loud sources. These results are compared to various relationships in the literature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Astronomical Journal IOP Publishing

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

The Astronomical Journal , Volume 155 (6): 4 – Jun 1, 2018
4 pages

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Copyright
Copyright © 2018. The American Astronomical Society. All rights reserved.
ISSN
0004-6256
eISSN
1538-3881
DOI
10.3847/1538-3881/aac01a
Publisher site
See Article on Publisher Site

Abstract

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. Arecibo observations with the 700–800 MHz receiver on the 305 m diameter William E. Gordon Telescope detected, serendipitously, H i in absorption against 4C+15.05 while using it as a bandpass calibrator for another object in an H i absorption project. Although the redshift we derive is different from that commonly in use in the literature (nominally z = 0.405), it agrees very well with the value of z = 0.833 determined by Stickel et al. This absorption feature is best fitted by a sum of three Gaussians, which yield an average redshift of z = 0.8336 ± 0.0004, although without corresponding high-resolution imaging it is not possible to say whether the components are parts of outflows or inflows. A total column density of N(H i) = 2.39 ± 0.13 × 1021 cm−2 is derived, relatively high compared to many radio-loud sources. These results are compared to various relationships in the literature.

Journal

The Astronomical JournalIOP Publishing

Published: Jun 1, 2018

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