Evidence for Two-Component Jet in Sw J1644+57
Abstract
The continued observations of Sw J1644+57 in X-ray and radio bands accumulated a rich data set to study the relativistic jet launched in this tidal disruption event. We find that the re-brightening feature in the radio light curve can be naturally explained by the two-component jet model. The possible origin of this structured jet are the Blandford-Znajek and Blandford-Payne mechanisms. We also show that this two-component jet model can interpret the two kinds of quasi-periodic variations in the X-ray light curve: a 200 second quasi-periodic oscillation (QPO) and a 2.7-day quasi-periodic variation. The latter is interpreted by a precessing outer jet launched near the Bardeen-Petterson radius of a warped disk. The 200s QPO could be associated with a second, narrower jet sweeping the observer line-of-sight periodically, which is launched from a spinning black hole in the misaligned direction with respect to the black hole's angular momentum.
Keywords
Cite
@article{arxiv.1511.02488,
title = {Evidence for Two-Component Jet in Sw J1644+57},
author = {Jiuzhou Wang and Weihua Lei and Dingxiong Wang and Wei Xie and Bing Zhang},
journal= {arXiv preprint arXiv:1511.02488},
year = {2015}
}
Comments
6 pages, 3 figures. In proceedings of "Swift: 10 Years of Discovery" congress (Rome, 2-4 December 2014), PoS(SWIFT 10)170