New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations
The supernova remnant (SNR) 30 Dor B is associated with the H ii region ionized by the OB association LH99. The complex interstellar environment has made it difficult to study the physical structure of this SNR. We have used Hubble Space Telescope H α images to identify SNR shocks and deep Chandra X...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/acff72 |
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| author | Wei-An Chen Chuan-Jui Li You-Hua Chu Shutaro Ueda Kuo-Song Wang Sheng-Yuan Liu Bo-An Chen |
| author_facet | Wei-An Chen Chuan-Jui Li You-Hua Chu Shutaro Ueda Kuo-Song Wang Sheng-Yuan Liu Bo-An Chen |
| author_sort | Wei-An Chen |
| collection | DOAJ |
| description | The supernova remnant (SNR) 30 Dor B is associated with the H ii region ionized by the OB association LH99. The complex interstellar environment has made it difficult to study the physical structure of this SNR. We have used Hubble Space Telescope H α images to identify SNR shocks and deep Chandra X-ray observations to detect faint diffuse emission. We find that 30 Dor B hosts three zones with very different X-ray surface brightnesses and nebular kinematics that are characteristic of SNRs in different interstellar environments and/or evolutionary stages. The ASKAP 888 MHz map of 30 Dor B shows counterparts to all X-ray emission features except the faint halo. The ASKAP 888 and 1420 MHz observations are used to produce a spectral index map, but its interpretation is complicated by the background thermal emission and the pulsar PSR J0537−6910's flat spectral index. The stellar population in the vicinity of 30 Dor B indicates a continuous star formation in the past 8–10 Myr. The observed very massive stars in LH99 cannot be coeval with the progenitor of 30 Dor B’s pulsar. Adopting the pulsar’s spin-down timescale, 5000 yr, as the age of the SNR, the X-ray shell would be expanding at ∼4000 km s ^−1 and the post-shock temperature would be 1–2 orders of magnitude higher than that indicated by the X-ray spectra. Thus, the bright central region of 30 Dor B and the X-ray shell requires two separate SN events, and the faint diffuse X-ray halo perhaps other older SN events. |
| first_indexed | 2024-03-11T17:01:20Z |
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| id | doaj.art-79898a4ba1834582b771920e32b0b8ef |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-11T17:01:20Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-79898a4ba1834582b771920e32b0b8ef2023-10-20T08:31:19ZengIOP PublishingThe Astronomical Journal1538-38812023-01-01166520410.3847/1538-3881/acff72New Insights on 30 Dor B Revealed by High-quality Multiwavelength ObservationsWei-An Chen0https://orcid.org/0000-0002-8336-2837Chuan-Jui Li1https://orcid.org/0000-0003-1449-7284You-Hua Chu2https://orcid.org/0000-0003-3667-574XShutaro Ueda3https://orcid.org/0000-0001-6252-7922Kuo-Song Wang4https://orcid.org/0000-0002-9323-0950Sheng-Yuan Liu5https://orcid.org/0000-0003-4603-7119Bo-An Chen6https://orcid.org/0009-0002-1602-2282Graduate Institute of Astrophysics, National Taiwan University , No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.; Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Institute of Astronomy and Astrophysics , Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.Department of Physics, National Taiwan University , No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, R.O.C.The supernova remnant (SNR) 30 Dor B is associated with the H ii region ionized by the OB association LH99. The complex interstellar environment has made it difficult to study the physical structure of this SNR. We have used Hubble Space Telescope H α images to identify SNR shocks and deep Chandra X-ray observations to detect faint diffuse emission. We find that 30 Dor B hosts three zones with very different X-ray surface brightnesses and nebular kinematics that are characteristic of SNRs in different interstellar environments and/or evolutionary stages. The ASKAP 888 MHz map of 30 Dor B shows counterparts to all X-ray emission features except the faint halo. The ASKAP 888 and 1420 MHz observations are used to produce a spectral index map, but its interpretation is complicated by the background thermal emission and the pulsar PSR J0537−6910's flat spectral index. The stellar population in the vicinity of 30 Dor B indicates a continuous star formation in the past 8–10 Myr. The observed very massive stars in LH99 cannot be coeval with the progenitor of 30 Dor B’s pulsar. Adopting the pulsar’s spin-down timescale, 5000 yr, as the age of the SNR, the X-ray shell would be expanding at ∼4000 km s ^−1 and the post-shock temperature would be 1–2 orders of magnitude higher than that indicated by the X-ray spectra. Thus, the bright central region of 30 Dor B and the X-ray shell requires two separate SN events, and the faint diffuse X-ray halo perhaps other older SN events.https://doi.org/10.3847/1538-3881/acff72Interstellar mediumSupernova remnantsMagellanic CloudsLarge Magellanic Cloud |
| spellingShingle | Wei-An Chen Chuan-Jui Li You-Hua Chu Shutaro Ueda Kuo-Song Wang Sheng-Yuan Liu Bo-An Chen New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations The Astronomical Journal Interstellar medium Supernova remnants Magellanic Clouds Large Magellanic Cloud |
| title | New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations |
| title_full | New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations |
| title_fullStr | New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations |
| title_full_unstemmed | New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations |
| title_short | New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations |
| title_sort | new insights on 30 dor b revealed by high quality multiwavelength observations |
| topic | Interstellar medium Supernova remnants Magellanic Clouds Large Magellanic Cloud |
| url | https://doi.org/10.3847/1538-3881/acff72 |
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