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Author Hui, C. Y. ♦ Lee, Jongsu ♦ Kong, A. K. H. ♦ Tam, P. H. T. ♦ Takata, J. ♦ Cheng, K. S. ♦ Ryu, Dongsu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ COMPARATIVE EVALUATIONS ♦ NEBULAE ♦ PULSARS ♦ SPECTRAL HARDENING ♦ STARS ♦ STELLAR WINDS ♦ VARIATIONS ♦ VELOCITY ♦ VISIBLE RADIATION ♦ X RADIATION
Abstract A recent study by Posselt et al. reported the deepest X-ray investigation of the Geminga pulsar wind nebula (PWN) by using Chandra X-ray Observatory . In comparison with previous studies of this system, a number of new findings have been reported, and we found that these suggest the possible variabilities in various components of this PWN. This motivates us to carry out a dedicated search for the morphological and spectral variations of this complex nebula. We have discovered variabilities on timescales from a few days to a few months from different components of the nebula. The fastest change occurred in the circumstellar environment at a rate of 80% of the speed of light. One of the most spectacular results is the wiggling of a half light-year long tail as an extension of the jet, which is significantly bent by the ram pressure. The jet wiggling occurred at a rate of about 20% of the speed of light. This twisted structure could possibly be a result of a propagating torsional Alfv́en wave. We have also found evidence of spectral hardening along this tail for a period of about nine months.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-09-10
Publisher Place United States
Journal Astrophysical Journal
Volume Number 846
Issue Number 2


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