ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6
We report the observations of the radio shell of the supernova remnant (SNR) G310.6–1.6 at 943 MHz from the Evolutionary Map of the Universe (EMU) and the Polarization Sky Survey of the Universe’s Magnetism (POSSUM) surveys by using the Australian Square Kilometre Array Pathfinder (ASKAP). We detect...
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2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adad66 |
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| author | Wenhui Jing Jennifer L. West Xiaohui Sun Wasim Raja Xianghua Li Lingxiao Dang Ping Zhou Miroslav D. Filipović Andrew M. Hopkins Roland Kothes Sanja Lazarević Denis Leahy Emil Lenc Yik Ki Ma Cameron L. Van Eck |
| author_facet | Wenhui Jing Jennifer L. West Xiaohui Sun Wasim Raja Xianghua Li Lingxiao Dang Ping Zhou Miroslav D. Filipović Andrew M. Hopkins Roland Kothes Sanja Lazarević Denis Leahy Emil Lenc Yik Ki Ma Cameron L. Van Eck |
| author_sort | Wenhui Jing |
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| description | We report the observations of the radio shell of the supernova remnant (SNR) G310.6–1.6 at 943 MHz from the Evolutionary Map of the Universe (EMU) and the Polarization Sky Survey of the Universe’s Magnetism (POSSUM) surveys by using the Australian Square Kilometre Array Pathfinder (ASKAP). We detect polarized emission from the central pulsar wind nebula (PWN) with rotation measures varying from –696 rad m ^−2 to –601 rad m ^−2 . We measure the integrated flux density of the shell to be 36.4 ± 2.2 mJy at 943 MHz and derive a spectral index of α _pwn = −0.4 ± 0.1 for the PWN and α _shell = −0.7 ± 0.3 for the SNR shell. From the combined radio and X-ray observations, the object can be identified as a supernova explosion of about 2500 yr ago with an energy of about 1.3 × 10 ^50 erg, suggesting an ejected mass of about 10 M _⊙ . The circular radio shell outside the circular hard X-ray shell is unique among Galactic SNRs. We discuss several possible scenarios, including blast wave, reverse shock, and pulsar-fed emission, but find that none of them can fully explain the observed characteristics of the shell. This poses a challenge for understanding the evolution of SNRs. The results of this paper demonstrate the potential of the ASKAP EMU and POSSUM surveys to discover more objects of small angular size and low surface brightness. |
| format | Article |
| id | doaj-art-7e094b90f77e4cac90f271257d73738f |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-7e094b90f77e4cac90f271257d73738f2025-02-12T06:51:56ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980216210.3847/1538-4357/adad66ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6Wenhui Jing0https://orcid.org/0009-0004-4090-9304Jennifer L. West1https://orcid.org/0000-0001-7722-8458Xiaohui Sun2https://orcid.org/0000-0002-3464-5128Wasim Raja3https://orcid.org/0000-0002-6155-9962Xianghua Li4https://orcid.org/0000-0002-9399-8433Lingxiao Dang5https://orcid.org/0009-0006-1753-7623Ping Zhou6https://orcid.org/0000-0002-5683-822XMiroslav D. Filipović7https://orcid.org/0000-0002-4990-9288Andrew M. Hopkins8https://orcid.org/0000-0002-6097-2747Roland Kothes9https://orcid.org/0000-0001-5953-0100Sanja Lazarević10https://orcid.org/0000-0001-6109-8548Denis Leahy11https://orcid.org/0000-0002-4814-958XEmil Lenc12https://orcid.org/0000-0002-9994-1593Yik Ki Ma13https://orcid.org/0000-0003-0742-2006Cameron L. Van Eck14https://orcid.org/0000-0002-7641-9946School of Physics and Astronomy, Yunnan University , Kunming, 650091, People’s Republic of China ; wh.jing@outlook.com, xhsun@ynu.edu.cn, xhli@ynu.edu.cnDominion Radio Astrophysical Observatory , Herzberg Astronomy & Astrophysics, National Research Council Canada, P.O. Box 248, Penticton, BC V2A 6J9, Canada ; jennifer.west@nrc-cnrc.gc.caSchool of Physics and Astronomy, Yunnan University , Kunming, 650091, People’s Republic of China ; wh.jing@outlook.com, xhsun@ynu.edu.cn, xhli@ynu.edu.cnAustralia Telescope National Facility , CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia ; Wasim.Raja@csiro.auSchool of Physics and Astronomy, Yunnan University , Kunming, 650091, People’s Republic of China ; wh.jing@outlook.com, xhsun@ynu.edu.cn, xhli@ynu.edu.cnSchool of Astronomy & Space Science, Nanjing University , 163 Xianlin Avenue, Nanjing 210023, People’s Republic of ChinaSchool of Astronomy & Space Science, Nanjing University , 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Ministry of Education, Nanjing 210023, People’s Republic of ChinaWestern Sydney University , Locked Bag 1797, Penrith South DC, NSW 2751, AustraliaSchool of Mathematical and Physical Sciences, 12 Wally’s Walk, Macquarie University , NSW 2109, AustraliaDominion Radio Astrophysical Observatory , Herzberg Astronomy & Astrophysics, National Research Council Canada, P.O. Box 248, Penticton, BC V2A 6J9, Canada ; jennifer.west@nrc-cnrc.gc.caAustralia Telescope National Facility , CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia ; Wasim.Raja@csiro.au; Western Sydney University , Locked Bag 1797, Penrith South DC, NSW 2751, Australia; Astronomical Observatory , Volgina 7, 11060 Belgrade, SerbiaDepartment of Physics and Astronomy University of Calgary , Calgary, AB, T2N 1N4, CanadaAustralia Telescope National Facility , CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia ; Wasim.Raja@csiro.auResearch School of Astronomy & Astrophysics, The Australian National University , Canberra, ACT 2611, Australia; Max-Planck-Institut für Radioastronomie , Auf dem Hügel 69, 53121 Bonn, GermanyResearch School of Astronomy & Astrophysics, The Australian National University , Canberra, ACT 2611, AustraliaWe report the observations of the radio shell of the supernova remnant (SNR) G310.6–1.6 at 943 MHz from the Evolutionary Map of the Universe (EMU) and the Polarization Sky Survey of the Universe’s Magnetism (POSSUM) surveys by using the Australian Square Kilometre Array Pathfinder (ASKAP). We detect polarized emission from the central pulsar wind nebula (PWN) with rotation measures varying from –696 rad m ^−2 to –601 rad m ^−2 . We measure the integrated flux density of the shell to be 36.4 ± 2.2 mJy at 943 MHz and derive a spectral index of α _pwn = −0.4 ± 0.1 for the PWN and α _shell = −0.7 ± 0.3 for the SNR shell. From the combined radio and X-ray observations, the object can be identified as a supernova explosion of about 2500 yr ago with an energy of about 1.3 × 10 ^50 erg, suggesting an ejected mass of about 10 M _⊙ . The circular radio shell outside the circular hard X-ray shell is unique among Galactic SNRs. We discuss several possible scenarios, including blast wave, reverse shock, and pulsar-fed emission, but find that none of them can fully explain the observed characteristics of the shell. This poses a challenge for understanding the evolution of SNRs. The results of this paper demonstrate the potential of the ASKAP EMU and POSSUM surveys to discover more objects of small angular size and low surface brightness.https://doi.org/10.3847/1538-4357/adad66Interstellar mediumSupernova remnantsRadio continuum emissionMagnetic fieldsPolarimetryPulsar wind nebulae |
| spellingShingle | Wenhui Jing Jennifer L. West Xiaohui Sun Wasim Raja Xianghua Li Lingxiao Dang Ping Zhou Miroslav D. Filipović Andrew M. Hopkins Roland Kothes Sanja Lazarević Denis Leahy Emil Lenc Yik Ki Ma Cameron L. Van Eck ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 The Astrophysical Journal Interstellar medium Supernova remnants Radio continuum emission Magnetic fields Polarimetry Pulsar wind nebulae |
| title | ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 |
| title_full | ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 |
| title_fullStr | ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 |
| title_full_unstemmed | ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 |
| title_short | ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6 |
| title_sort | askap observations of the radio shell in the composite supernova remnant g310 6 1 6 |
| topic | Interstellar medium Supernova remnants Radio continuum emission Magnetic fields Polarimetry Pulsar wind nebulae |
| url | https://doi.org/10.3847/1538-4357/adad66 |
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