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Low-frequency Radio Absorption in Tycho’s Supernova Remnant

  • Authors: Maria Arias, Jacco Vink, Ping Zhou, Francesco de Gasperin, Martin J. Hardcastle, and Tim W. Shimwell

2019 The Astronomical Journal 158 253.

  • Provider: AAS Journals

Caption: Figure 4.

Radio spectrum of Tycho at LOFAR frequencies. The magenta points correspond to the full bandwidth maps and the blue points correspond to the narrow band maps. The green line corresponds to the power-law spectral index (PL SPX) of 0.58 reported in Green (2017), and the blue line is the best-fit (BF) power-law spectral index from the LOFAR data points. The errors bars have been normalized so the reduced χ2 of the best-fit power law (in blue) is equal to 1, but we note that the uncertainties in the LOFAR in-band have not been systematically analyzed and can be unreliable. Our measurements agree with earlier reports that the radio spectrum of Tycho steepens at low radio frequencies.

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