Time Variability of Nonthermal X-ray Stripes in Tycho's Supernova Remnant with Chandra

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 previous 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 moved outward. Our spectral analysis reveal 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 brightening of $\sim 70\%$ and hardening of $\Delta \Gamma \sim 0.45$. The time variability can be explained if the magnetic field is amplified to $\sim 100\mu \mathrm{G}$ and/or if magnetic turbulence significantly changes with time.

8 pages, 3 figures, 2 tables, accepted for publication in ApJ

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• Discovery of Year-Scale Time Variability from Thermal X-ray Emission in Tycho's Supernova Remnant
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• Expansion and ongoing cosmic ray acceleration in HESS J1731-347
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• A Possible Gamma-Ray Enhancement Event in Tycho's Supernova Remnant
• Brightening and Fading in the Youngest Galactic Supernova Remnant G1.9+0.3: 13 years of monitoring with the Chandra X-ray Observatory