{"title":"The Evolution of Radio Flux Density of Supernova Remnant G1.9+0.3","authors":"Chen Xin, Sun Xiao-Hui","doi":"10.1016/j.chinastron.2022.11.002","DOIUrl":null,"url":null,"abstract":"<div><p>Radio observations of young supernova<span> remnants (SNRs) can shed light on the early evolution of SNRs. We selected G1.9+0.3 which is the youngest SNR in the Milky Way Galaxy<span><span> for a study. We compiled the radio flux densities currently available and converted them to the same frequency, which leaves us the evolution of the flux density for the past nearly 50 years. We found that the flux density increased before 2008 and decreased afterwards, meaning the flux density reaching the maximum at an age of about 150–155 yr. We attributed the brightening of the SNR to the increase of either magnetic field or the accelerated </span>high energy electrons<span>. Based on the age at which the flux density reached the peak, combined with the previous numerical simulation, we discussed the ejecta mass of the supernova and kinetic energy released by the supernova explosion.</span></span></span></p></div>","PeriodicalId":35730,"journal":{"name":"Chinese Astronomy and Astrophysics","volume":"46 4","pages":"Pages 426-432"},"PeriodicalIF":0.0000,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Astronomy and Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0275106222000923","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Physics and Astronomy","Score":null,"Total":0}
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Abstract
Radio observations of young supernova remnants (SNRs) can shed light on the early evolution of SNRs. We selected G1.9+0.3 which is the youngest SNR in the Milky Way Galaxy for a study. We compiled the radio flux densities currently available and converted them to the same frequency, which leaves us the evolution of the flux density for the past nearly 50 years. We found that the flux density increased before 2008 and decreased afterwards, meaning the flux density reaching the maximum at an age of about 150–155 yr. We attributed the brightening of the SNR to the increase of either magnetic field or the accelerated high energy electrons. Based on the age at which the flux density reached the peak, combined with the previous numerical simulation, we discussed the ejecta mass of the supernova and kinetic energy released by the supernova explosion.
期刊介绍：
The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.
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