Radio-continuum emission from the young galactic supernova remnant G1.9+0.3
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 Ve...
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Astronomical Observatory, Department of Astronomy, Belgrade
2014-01-01
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Series: | Serbian Astronomical Journal |
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Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1400001H.pdf |
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author | de Horta A.Y. Filipović M.D. Crawford E.J. Stootman F.H. Pannuti T.G. Bozzetto L.M. Collier J.D. Sommer E.R. Kosakowski A.R. |
author_facet | de Horta A.Y. Filipović M.D. Crawford E.J. Stootman F.H. Pannuti T.G. Bozzetto L.M. Collier J.D. Sommer E.R. Kosakowski A.R. |
author_sort | de Horta A.Y. |
collection | DOAJ |
description | 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≈273μG, 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. |
first_indexed | 2024-04-12T07:14:23Z |
format | Article |
id | doaj.art-e5d8b391d3194310b9f98e8497ad4a1b |
institution | Directory Open Access Journal |
issn | 1450-698X 1820-9289 |
language | English |
last_indexed | 2024-04-12T07:14:23Z |
publishDate | 2014-01-01 |
publisher | Astronomical Observatory, Department of Astronomy, Belgrade |
record_format | Article |
series | Serbian Astronomical Journal |
spelling | doaj.art-e5d8b391d3194310b9f98e8497ad4a1b2022-12-22T03:42:31ZengAstronomical Observatory, Department of Astronomy, BelgradeSerbian Astronomical Journal1450-698X1820-92892014-01-012014189415110.2298/SAJ140605001H1450-698X1400001HRadio-continuum emission from the young galactic supernova remnant G1.9+0.3de Horta A.Y.0Filipović M.D.1Crawford E.J.2Stootman F.H.3Pannuti T.G.4Bozzetto L.M.5Collier J.D.6Sommer E.R.7Kosakowski A.R.8University of Western Sydney, Locked Bag, Penrith South, AustraliaUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaMorehead State University, Department of Earth and Space Sciences, Space Science Center, Morehead, USAUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaUniversity of Western Sydney, Locked Bag, Penrith South, AustraliaMorehead State University, Department of Earth and Space Sciences, Space Science Center, Morehead, USAWe 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≈273μG, 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.http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1400001H.pdfISM: individual objects: G1.9+0.3ISM: supernova remnantsradiocontinuum: ISMsupernovae: general |
spellingShingle | de Horta A.Y. Filipović M.D. Crawford E.J. Stootman F.H. Pannuti T.G. Bozzetto L.M. Collier J.D. Sommer E.R. Kosakowski A.R. Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 Serbian Astronomical Journal ISM: individual objects: G1.9+0.3 ISM: supernova remnants radiocontinuum: ISM supernovae: general |
title | Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 |
title_full | Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 |
title_fullStr | Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 |
title_full_unstemmed | Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 |
title_short | Radio-continuum emission from the young galactic supernova remnant G1.9+0.3 |
title_sort | radio continuum emission from the young galactic supernova remnant g1 9 0 3 |
topic | ISM: individual objects: G1.9+0.3 ISM: supernova remnants radiocontinuum: ISM supernovae: general |
url | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1400001H.pdf |
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