CO Observations of the Type Ia Supernova Remnant 3C 397 by the Nobeyama 45 m Radio Telescope: Possible Evidence for the Single-degenerated Explosion

We present a new CO observation toward the Type Ia supernova remnant 3C 397 using the Nobeyama 45 m radio telescope at an unprecedented angular resolution of  ∼18″. We newly found that the CO cloud at V LSR = 55.7–62.2 km s −1 (60 km s −1 cloud) shows a good spatial correspondence with the radio con...

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Bibliographic Details
Published in:The Astrophysical journal Vol. 978; no. 2; pp. 123 - 131
Main Authors: Ito, D., Sano, H., Nakazawa, K., Mitsuishi, I., Fukui, Y., Sudou, H., Takaba, H.
Format: Journal Article
Language:English
Published: Philadelphia The American Astronomical Society 10.01.2025
IOP Publishing
Subjects:
Angular resolution
Feedback
Galactic structure
Interstellar medium
Radio telescopes
Supernova
Supernova remnants
X-ray sources
ISSN:0004-637X, 1538-4357
Online Access:Get full text
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Summary:We present a new CO observation toward the Type Ia supernova remnant 3C 397 using the Nobeyama 45 m radio telescope at an unprecedented angular resolution of  ∼18″. We newly found that the CO cloud at V LSR = 55.7–62.2 km s −1 (60 km s −1 cloud) shows a good spatial correspondence with the radio continuum shell. We also found an expanding gas motion of the 60 km s −1 cloud with an expansion velocity of  ∼3 km s −1 , which is thought to be formed by the pre- and/or postsupernova feedback. By considering the positions of Galactic spiral arms and the X-ray/H i absorption studies, we concluded that 3C 397 is physically associated with the 60 km s −1 cloud rather than the previously known CO cloud at V LSR  ∼ 30 km s −1 . Given that the previously measured preshock density is  ∼2–5 cm −3 , the expanding motion of the 60 km s −1 cloud was likely formed by the presupernova feedback known as optically thick wind. The scenario is consistent with the fact that 3C 397 exploded inside a wind-blown bubble as a single degenerate system.
Bibliography:AAS53153
High-Energy Phenomena and Fundamental Physics
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ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad95f5