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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Detalles Bibliográficos
Publicado: 2015
Materias:
ISM: individual objects: puppis A
ISM: supernova remnants
Radiation mechanisms: non-thermal
Radio continuum: ISM
Techniques: interferometric
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v451_n3_p3044_Reynoso
http://hdl.handle.net/20.500.12110/paper_00358711_v451_n3_p3044_Reynoso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v451_n3_p3044_Reynoso
record_format dspace
spelling paper:paper_00358711_v451_n3_p3044_Reynoso2023-06-08T15:01:40Z Radio spectral characteristics of the supernova remnant puppis A and nearby sources 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v451_n3_p3044_Reynoso 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
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.
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
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v451_n3_p3044_Reynoso
http://hdl.handle.net/20.500.12110/paper_00358711_v451_n3_p3044_Reynoso
_version_ 1768542165083881472

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