Radio spectral characteristics of the supernova remnant puppis A and nearby sources
© 2015 The Authors. This paper presents a new study of the spectral index distribution of the supernova remnant (SNR) Puppis A. The nature of field compact sources is also investigated according to the measured spectral indices. This work is based on new observations of Puppis A and its surroundings...
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| Format: | Journal Article |
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OXFORD UNIV PRESS
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/4045 |
| _version_ | 1848744403707887616 |
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| author | Reynoso, E. Walsh, Andrew |
| author_facet | Reynoso, E. Walsh, Andrew |
| author_sort | Reynoso, E. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2015 The Authors. This paper presents a new study of the spectral index distribution of the supernova remnant (SNR) Puppis A. The nature of field compact sources is also investigated according to the measured spectral indices. This work is based on new observations of Puppis A and its surroundings performed with the Australia Telescope Compact Array in two configurations using the Compact Array Broad-band Backend centred at 1.75 GHz. We find that the global spectral index of Puppis A is a = -0.563 ± 0.013. Local variations have been detected, however this global index represents well the bulk of the SNR. At the SE, we found a pattern of parallel strips with a flat spectrum compatible with small-scale filaments, although not correlated in detail. The easternmost filament agrees with the idea that the SNR shock front is interacting with an external cloud. There is no evidence of the previously suggested correlation between emissivity and spectral index. A number of compact features are proposed to be evolved clumps of ejecta based on their spectral indices, although dynamic measurements are needed to confirm this hypothesis. We estimate precise spectral indices for the five previously known field sources, two of which are found to be double (one of them, probably triple), and catalogue 40 new sources. In the light of these new determinations, the extragalactic nature previously accepted for some compact sources is now in doubt. |
| first_indexed | 2025-11-14T06:00:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-4045 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:00:55Z |
| publishDate | 2015 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-40452017-09-13T14:30:54Z Radio spectral characteristics of the supernova remnant puppis A and nearby sources Reynoso, E. Walsh, Andrew © 2015 The Authors. This paper presents a new study of the spectral index distribution of the supernova remnant (SNR) Puppis A. The nature of field compact sources is also investigated according to the measured spectral indices. This work is based on new observations of Puppis A and its surroundings performed with the Australia Telescope Compact Array in two configurations using the Compact Array Broad-band Backend centred at 1.75 GHz. We find that the global spectral index of Puppis A is a = -0.563 ± 0.013. Local variations have been detected, however this global index represents well the bulk of the SNR. At the SE, we found a pattern of parallel strips with a flat spectrum compatible with small-scale filaments, although not correlated in detail. The easternmost filament agrees with the idea that the SNR shock front is interacting with an external cloud. There is no evidence of the previously suggested correlation between emissivity and spectral index. A number of compact features are proposed to be evolved clumps of ejecta based on their spectral indices, although dynamic measurements are needed to confirm this hypothesis. We estimate precise spectral indices for the five previously known field sources, two of which are found to be double (one of them, probably triple), and catalogue 40 new sources. In the light of these new determinations, the extragalactic nature previously accepted for some compact sources is now in doubt. 2015 Journal Article http://hdl.handle.net/20.500.11937/4045 10.1093/mnras/stv1147 OXFORD UNIV PRESS fulltext |
| spellingShingle | Reynoso, E. Walsh, Andrew Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title | Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title_full | Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title_fullStr | Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title_full_unstemmed | Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title_short | Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| title_sort | radio spectral characteristics of the supernova remnant puppis a and nearby sources |
| url | http://hdl.handle.net/20.500.11937/4045 |