The radio remnant of Supernova 1987A at high frequencies and high resolution
| Autor: | Bryan Gaensler, Anastasios Tzioumis, Lister Staveley-Smith, Chi-Yung Ng, Giovanna Zanardo, Richard N. Manchester, Toby Potter |
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| Rok vydání: | 2013 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Spectral index Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject Resolution (electron density) FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Pulsar wind nebula Asymmetry law.invention Telescope Supernova Space and Planetary Science law Astrophysics - High Energy Astrophysical Phenomena Absorption (electromagnetic radiation) Supernova remnant Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | Proceedings of the International Astronomical Union. 9:23-26 |
| ISSN: | 1743-9221 1743-9213 |
| DOI: | 10.1017/s1743921313009186 |
| Popis: | As the remnant of Supernova (SN) 1987A has been getting brighter over time, new observations at high frequencies have allowed imaging of the radio emission at unprecedented detail. We present a new radio image at 44 GHz of the supernova remnant (SNR), derived from observations performed with the Australia Telescope Compact Array (ATCA) in 2011. The diffraction-limited image has a resolution of $349\times225$ mas, which is the highest achieved to date in high-dynamic range images of the SNR. We also present a new image at 18 GHz, also derived from ATCA observations performed in 2011, which is super-resolved to $0./!/!^{\prime\prime}25$. The new 44 and 18 GHz images yield the first high-resolution spectral index map of the remnant. The comparison of the 44 GHz image with contemporaneous X-ray and H$\alpha$ observations allows further investigations of the nature of the remnant asymmetry and sheds more light into the progenitor hypotheses and SN explosion. In light of simple free-free absorption models, we discuss the likelihood of detecting at 44 GHz the possible emission originating from a pulsar wind nebula (PWN) or a compact source in the centre of the remnant. Comment: 4 pages, to appear in the proceedings of IAU Symposium 296, "Supernova Environmental Impacts" (eds Ray and McCray) |
| Databáze: | OpenAIRE |
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