RADIO-CONTINUUM EMISSION FROM THE YOUNG GALACTIC SUPERNOVA REMNANT G1.9+0.3

Serbian Astronomical Journal

article

A. Y. De Horta¹  M. D. Filipovi´¹  E. J. Crawford¹  F. H. Stootman¹  T. G. Pannuti²  L. M. Bozzetto¹  J. D. Collier¹  E. R. Sommer¹  A. R. Kosakowski² 

[1] University of Western Sydney;Space Science Center, Department of Earth and Space Sciences, Morehead State University

关键词: ISM: individual objects: G1.9+0.3;    ISM: supernova remnants;    radio continuum: ISM;    supernovae: general;   

DOI  :  10.2298/SAJ140605001H

来源: Astronomical Observatory, Department of Astronomy, Belgrade

【 摘 要 】

We present an analysis of a new Australia Telescope Compact Array (ATCA) radio-continuum observation of supernova remnant (SNR) G1.9+0.3, which at an age of ∼181±25 years is the youngest known in the Galaxy. We analysed all available radio-continuum observations at 6-cm from the ATCA and Very Large Array. Using this data we estimate an expansion rate for G1.9+0.3 of 0.563%±0.078% per year between 1984 and 2009. We note that in the 1980’s G1.9+0.3 expanded somewhat slower (0.484% per year) than more recently (0.641% per year). We estimate that the average spectral index between 20-cm and 6-cm, across the entire SNR is α=–0.72±0.26 which is typical for younger SNRs. At 6- cm, we detect an average of 6% fractionally polarised radio emission with a peak of 17%±3%. The polarised emission follows the contours of the strongest of X-ray emission. Using the new equipartition formula we estimate a magnetic field strength of B≈273 µG, which to date, is one of the highest magnetic field strength found for any SNR and consistent with G1.9+0.3 being a very young remnant.

【 授权许可】

CC BY-NC-ND