Radio spectral characteristics of the supernova remnant puppis A and nearby sources
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...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00358711_v451_n3_p3044_Reynoso |
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todo:paper_00358711_v451_n3_p3044_Reynoso2023-10-03T14:47:13Z Radio spectral characteristics of the supernova remnant puppis A and nearby sources Reynoso, E.M. Walsh, A.J. ISM: individual objects: puppis A ISM: supernova remnants Radiation mechanisms: non-thermal Radio continuum: ISM Techniques: interferometric 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 α = -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 The Authors. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v451_n3_p3044_Reynoso |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ISM: individual objects: puppis A ISM: supernova remnants Radiation mechanisms: non-thermal Radio continuum: ISM Techniques: interferometric |
| spellingShingle |
ISM: individual objects: puppis A ISM: supernova remnants Radiation mechanisms: non-thermal Radio continuum: ISM Techniques: interferometric Reynoso, E.M. Walsh, A.J. Radio spectral characteristics of the supernova remnant puppis A and nearby sources |
| topic_facet |
ISM: individual objects: puppis A ISM: supernova remnants Radiation mechanisms: non-thermal Radio continuum: ISM Techniques: interferometric |
| description |
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 α = -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 The Authors. |
| format |
JOUR |
| author |
Reynoso, E.M. Walsh, A.J. |
| author_facet |
Reynoso, E.M. Walsh, A.J. |
| author_sort |
Reynoso, E.M. |
| title |
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_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_sort |
radio spectral characteristics of the supernova remnant puppis a and nearby sources |
| url |
http://hdl.handle.net/20.500.12110/paper_00358711_v451_n3_p3044_Reynoso |
| work_keys_str_mv |
AT reynosoem radiospectralcharacteristicsofthesupernovaremnantpuppisaandnearbysources AT walshaj radiospectralcharacteristicsofthesupernovaremnantpuppisaandnearbysources |
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1807318671458041856 |