2009/01/30 by Toru Tamagawa, Asami Hayato, Satoshi Nakamura +19 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #Astrophysical Phenomena and Observations
paper · pdf · doi:10.1093/pasj/61.sp1.s167
Abstract Tycho’s supernova remnant was observed by the XIS and HXD instruments onboard the Suzaku satellite on 2006 June 26–29 for 92 ks. The spectrum up to 30 keV was well fitted with a two-component model, consisting of a power-law with a photon index of 2.7 and a thermal bremsstrahlung model with a temperature of 4.7 keV. The former component can alternatively be modeled as synchrotron emission from a population of relativistic electrons with an estimated roll-off energy of around 1 keV. In the XIS spectra, in addition to the prominent Fe Kα line (6.445 keV), we observed for the first time significant Kα line emission from trace species Cr and Mn at energies of 5.48 keV and 5.95 keV, respectively. Faint Kβ lines from Ca (4.56 keV) and Fe (7.11 keV) were also seen. The ionization states of Cr and Mn, based on their line centroids, are estimated to be similar to that of Fe Kα (FeXV or XVI).