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Clumps and rings of ejecta in SNR 0540–69.3 as seen in 3D
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Larsson, J., Sollerman, J., Lyman, J. D., Spyromilio, J., Tenhu, L., Fransson, C. and Lundqvist, P. (2021) Clumps and rings of ejecta in SNR 0540–69.3 as seen in 3D. The Astrophysical Journal, 922 (2). 265. doi:10.3847/1538-4357/ac2a41 ISSN 0004-637X.
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Official URL: https://doi.org/10.3847/1538-4357/ac2a41
Abstract
The distribution of ejecta in young supernova remnants offers a powerful observational probe of their explosions and progenitors. Here we present a 3D reconstruction of the ejecta in SNR 0540-69.3, which is an O-rich remnant with a pulsar wind nebula located in the LMC. We use observations from the Very Large Telescope (VLT)/MUSE to study Hβ, [O iii] λλ4959, 5007, Hα, [S ii] λλ6717, 6731, [Ar iii] λ7136, and [S iii] λ9069. This is complemented by 2D spectra from VLT/X-shooter, which also cover [O ii] λλ3726, 3729, and [Fe ii] λ12567. We identify three main emission components: (i) clumpy rings in the inner nebula (≲1000 km s−1) with similar morphologies in all lines; (ii) faint extended [O iii] emission dominated by an irregular ring-like structure with radius ∼1600 km s−1 and inclination ∼40°, but with maximal velocities reaching ∼3000 km s−1; and (iii) a blob of Hα and Hβ located southeast of the pulsar at velocities ∼1500–3500 km s−1. We analyze the geometry using a clump-finding algorithm and use the clumps in the [O iii] ring to estimate an age of 1146 ± 116 yr. The observations favor an interpretation of the [O iii] ring as ejecta, while the origin of the H-blob is more uncertain. An alternative explanation is that it is the blown-off envelope of a binary companion. From the detection of Balmer lines in the innermost ejecta we confirm that SNR 0540 was a Type II supernova and that hydrogen was mixed down to low velocities in the explosion.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Supernova remnants | |||||||||
Journal or Publication Title: | The Astrophysical Journal | |||||||||
Publisher: | Institute of Physics Publishing, Inc. | |||||||||
ISSN: | 0004-637X | |||||||||
Official Date: | 6 December 2021 | |||||||||
Dates: |
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Volume: | 922 | |||||||||
Number: | 2 | |||||||||
Article Number: | 265 | |||||||||
DOI: | 10.3847/1538-4357/ac2a41 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 21 February 2022 | |||||||||
Date of first compliant Open Access: | 21 February 2022 | |||||||||
RIOXX Funder/Project Grant: |
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