English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper presents a new study of the spectral index distribution of thesupernova remnant (SNR) Puppis A. The nature of field compact sources is alsoinvestigated according to the measured spectral indices. This work is based onnew observations of Puppis A and its surroundings performed with the AustraliaTelescope Compact Array in two configurations using the Compact ArrayBroad-band Backend centered at 1.75 GHz. We find that the global spectral indexof Puppis A is -0.563 +/- 0.013. Local variations have been detected, howeverthis global index represents well the bulk of the SNR. At the SE, we found apattern of parallel strips with a flat spectrum compatible with small-scalefilaments, although not correlated in detail. The easternmost filament agreeswith the idea that the SN shock front is interacting with an external cloud.There is no evidence of the previously suggested correlation between emissivityand spectral index. A number of compact features are proposed to be evolvedclumps of ejecta based on their spectral indices, although dynamic measurementsare needed to confirm this hypothesis. We estimate precise spectral indices forthe 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 ofthese new determinations, the extragalactic nature previously accepted for somecompact sources is now in doubt.

Radio spectral characteristics of the supernova remnant Puppis A and nearby sources