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Time Variability of Nonthermal X-Ray Stripes in Tycho's Supernova Remnant with Chandra.
- Source :
-
Astrophysical Journal . May2020, Vol. 894 Issue 1, p1-7. 7p. - Publication Year :
- 2020
-
Abstract
- Analyzing Chandra data of Tycho's supernova remnant (SNR) taken in 2000, 2003, 2007, 2009, and 2015, we search for time-variable features of synchrotron X-rays in the southwestern part of the SNR, where stripe structures of hard X-ray emission were previously found. By comparing X-ray images obtained at each epoch, we discover a knot-like structure in the northernmost part of the stripe region became brighter particularly in 2015. We also find a bright filamentary structure gradually became fainter and narrower as it moves outward. Our spectral analysis reveals that not only the nonthermal X-ray flux but also the photon indices of the knot-like structure change from year to year. During the period from 2000 to 2015, the small knot shows a brightening of ∼70% and hardening of ΔΓ ∼ 0.45. The time variability can be explained if the magnetic field is amplified to and/or if magnetic turbulence significantly changes with time. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPERNOVA remnants
*X-rays
*HARD X-rays
*STRIPES
*MAGNETIC fields
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 894
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 143141939
- Full Text :
- https://doi.org/10.3847/1538-4357/ab837e