Radio observations of supernova remnant G1.9+0.3
We present 1–10 GHz radio continuum flux density, spectral index, polarization, and rotation measure (RM) images of the youngest known Galactic supernova remnant (SNR) G1.9+0.3, using observations from the Australia Telescope Compact Array. We have conducted an expansion study spanning eight epochs...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Oxford University Press
2019
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| _version_ | 1797055723623940096 |
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| author | Luken, KJ Filipovic, MD Maxted, NI Kothes, R Norris, RP Allison, JR Blackwell, R Braiding, C Brose, R Burton, M De Horta, AY Galvin, TJ Harvey-Smith, L Hurley-Walker, N Leahy, D Ralph, NO Roper, Q Rowell, G Sushch, I Urosevic, D Wong, GF |
| author_facet | Luken, KJ Filipovic, MD Maxted, NI Kothes, R Norris, RP Allison, JR Blackwell, R Braiding, C Brose, R Burton, M De Horta, AY Galvin, TJ Harvey-Smith, L Hurley-Walker, N Leahy, D Ralph, NO Roper, Q Rowell, G Sushch, I Urosevic, D Wong, GF |
| author_sort | Luken, KJ |
| collection | OXFORD |
| description | We present 1–10 GHz radio continuum flux density, spectral index, polarization, and rotation measure (RM) images of the youngest known Galactic supernova remnant (SNR) G1.9+0.3, using observations from the Australia Telescope Compact Array. We have conducted an expansion study spanning eight epochs between 1984 and 2017, yielding results consistent with previous expansion studies of G1.9+0.3. We find a mean radio continuum expansion rate of (0.78 ± 0.09) per cent yr−1 (or ∼8900 km s−1 at an assumed distance of 8.5 kpc), although the expansion rate varies across the SNR perimetre. In the case of the most recent epoch between 2016 and 2017, we observe faster-than-expected expansion of the northern region. We find a global spectral index for G1.9+0.3 of −0.81 ± 0.02 (76 MHz–10 GHz). Towards the northern region, however, the radio spectrum is observed to steepen significantly (∼−1). Towards the two so-called (east and west) ‘ears’ of G1.9+0.3, we find very different RM values of 400–600 and 100–200 rad m2, respectively. The fractional polarization of the radio continuum emission reaches (19 ± 2) per cent, consistent with other, slightly older, SNRs such as Cas A. |
| first_indexed | 2024-03-06T19:13:52Z |
| format | Journal article |
| id | oxford-uuid:17afc352-8bb9-4744-b541-31c4d93d5901 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:13:52Z |
| publishDate | 2019 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:17afc352-8bb9-4744-b541-31c4d93d59012022-03-26T10:38:53ZRadio observations of supernova remnant G1.9+0.3Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:17afc352-8bb9-4744-b541-31c4d93d5901EnglishSymplectic ElementsOxford University Press2019Luken, KJFilipovic, MDMaxted, NIKothes, RNorris, RPAllison, JRBlackwell, RBraiding, CBrose, RBurton, MDe Horta, AYGalvin, TJHarvey-Smith, LHurley-Walker, NLeahy, DRalph, NORoper, QRowell, GSushch, IUrosevic, DWong, GFWe present 1–10 GHz radio continuum flux density, spectral index, polarization, and rotation measure (RM) images of the youngest known Galactic supernova remnant (SNR) G1.9+0.3, using observations from the Australia Telescope Compact Array. We have conducted an expansion study spanning eight epochs between 1984 and 2017, yielding results consistent with previous expansion studies of G1.9+0.3. We find a mean radio continuum expansion rate of (0.78 ± 0.09) per cent yr−1 (or ∼8900 km s−1 at an assumed distance of 8.5 kpc), although the expansion rate varies across the SNR perimetre. In the case of the most recent epoch between 2016 and 2017, we observe faster-than-expected expansion of the northern region. We find a global spectral index for G1.9+0.3 of −0.81 ± 0.02 (76 MHz–10 GHz). Towards the northern region, however, the radio spectrum is observed to steepen significantly (∼−1). Towards the two so-called (east and west) ‘ears’ of G1.9+0.3, we find very different RM values of 400–600 and 100–200 rad m2, respectively. The fractional polarization of the radio continuum emission reaches (19 ± 2) per cent, consistent with other, slightly older, SNRs such as Cas A. |
| spellingShingle | Luken, KJ Filipovic, MD Maxted, NI Kothes, R Norris, RP Allison, JR Blackwell, R Braiding, C Brose, R Burton, M De Horta, AY Galvin, TJ Harvey-Smith, L Hurley-Walker, N Leahy, D Ralph, NO Roper, Q Rowell, G Sushch, I Urosevic, D Wong, GF Radio observations of supernova remnant G1.9+0.3 |
| title | Radio observations of supernova remnant G1.9+0.3 |
| title_full | Radio observations of supernova remnant G1.9+0.3 |
| title_fullStr | Radio observations of supernova remnant G1.9+0.3 |
| title_full_unstemmed | Radio observations of supernova remnant G1.9+0.3 |
| title_short | Radio observations of supernova remnant G1.9+0.3 |
| title_sort | radio observations of supernova remnant g1 9 0 3 |
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