Fa-bo Feng. Radio Jets and Galaxies as Cosmic String Probes
Natural Sciences / Astronomy / Cosmology
Submitted on: Apr 11, 2012, 07:52:08
Description: The lensing effect of a cosmic string is studied, and some new methods are proposed to detect the cosmic string. We use the "alignment-breaking parameter" eta_G as a sensitive indicator of gravitational distortion by a wiggly cosmic string. Then, we applied the non-constant deflection angle to jets, and eta_G of a specific jet is just related to the projected slope of the jet. In the direction of the string, we find that galaxies appear to be rounder for an observer and the distribution of apparent ellipticity changes correspondingly. The future survey, such as Large Synoptic Survey Telescope (LSST) and Dark Energy Survey (DES), would weaken the requirement of special geometry in the data processing. As a result, all kinds of distributions, including ellipticity axis distribution, would serve as probes to detect wiggly strings in the near future. In brief, if a wiggly cosmic string existed, these signals would be convenient to be observed with the future weak lensing survey or other surveys in deep space. If there was no lensing signal in these distributions, it would give the upper limit of the abundance of infinite strings.