Chen 陳, Wei-An 韋安 and Li 李, Chuan-Jui 傳睿 and Chu 朱, You-Hua 有花 and Ueda 上田, Shutaro 周太朗 and Wang 王, Kuo-Song 國松 and Liu 呂, Sheng-Yuan 聖元 and Chen 陳, Bo-An 柏安 (2023) New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations. The Astronomical Journal, 166 (5). p. 204. ISSN 0004-6256
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Abstract
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 Hα 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.
Item Type: | Article |
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Subjects: | OA Open Library > Physics and Astronomy |
Depositing User: | Unnamed user with email support@oaopenlibrary.com |
Date Deposited: | 14 Nov 2023 05:03 |
Last Modified: | 14 Nov 2023 05:03 |
URI: | http://archive.sdpublishers.com/id/eprint/2035 |