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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

Decomposing the kinematics of SNR G180.0-01.7 with medium-resolution spectra

  • Juan-Juan Ren1
  • Wei Zhang1,2
  • Chao-Jian Wu1,2
  • Chao Liu1
  • Jian-Jun Chen1
  • Hong Wu1,2
  1. 1National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101 ,
  2. 2CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101 ,
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Abstract

The exceptionally large angular diameter and intrinsic optical faintness of the Galactic supernova remnant (SNR) G180.0-01.7 (S147) have historically hindered a comprehensive spectroscopic census of its filamentary structure. We present the first dedicated medium-resolution (R ∼ 7500) spectroscopic study of S147 using the LAMOST medium-resolution spectroscopic survey of Galactic Nebulae. By implementing multi-Gaussian decomposition on the H α, [N ii], and [S ii] emission complexes and applying combined spectroscopic and spatial criteria, we disentangle the shock-ionized filaments of the SNR from the pervasive foreground and background diffuse ionized gas (DIG). Our analysis reveals a distinct bimodal radial velocity distribution for the SNR: a low-velocity population tracing the decelerated forward shock at a dense cavity wall, and a high-velocity population (with absolute radial velocities of ∼70 ± 30 km s−1) corresponding to ejecta within a low-density cavity. The coexistence of these populations provides kinematic evidence for the ‘supernova-in-a-cavity’ scenario. Furthermore, we detect enhanced [S ii]/H α ratios in the DIG along the eastern and northern boundaries of the remnant, signaling shock compression of the ambient interstellar medium and highlighting remnant’s multifaceted feedback.

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Cite

BibTeXRIS
BibTeX
@article{ren2026decomposing,
  title = {{Decomposing the kinematics of SNR G180.0-01.7 with medium-resolution spectra}},
  author = {Juan-Juan Ren and Wei Zhang and Chao-Jian Wu and Chao Liu and Jian-Jun Chen and Hong Wu},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = oct,
  doi = {10.1093/mnras/stag1813},
  url = {https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1813/8994784},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Decomposing the kinematics of SNR G180.0-01.7 with medium-resolution spectra
AU  - Juan-Juan Ren
AU  - Wei Zhang
AU  - Chao-Jian Wu
AU  - Chao Liu
AU  - Jian-Jun Chen
AU  - Hong Wu
PY  - 2026
DA  - 2026/10/24
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag1813
UR  - https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1813/8994784
AB  - The exceptionally large angular diameter and intrinsic optical faintness of the Galactic supernova remnant (SNR) G180.0-01.7 (S147) have historically hindered a comprehensive spectroscopic census of its filamentary structure. We present the first dedicated medium-resolution (R ∼ 7500) spectroscopic study of S147 using the LAMOST medium-resolution spectroscopic survey of Galactic Nebulae. By implementing multi-Gaussian decomposition on the H α, [N ii], and [S ii] emission complexes and applying combined spectroscopic and spatial criteria, we disentangle the shock-ionized filaments of the SNR from the pervasive foreground and background diffuse ionized gas (DIG). Our analysis reveals a distinct bimodal radial velocity distribution for the SNR: a low-velocity population tracing the decelerated forward shock at a dense cavity wall, and a high-velocity population (with absolute radial velocities of ∼70 ± 30 km s^−1) corresponding to ejecta within a low-density cavity. The coexistence of these populations provides kinematic evidence for the ‘supernova-in-a-cavity’ scenario. Furthermore, we detect enhanced [S ii]/H α ratios in the DIG along the eastern and northern boundaries of the remnant, signaling shock compression of the ambient interstellar medium and highlighting remnant’s multifaceted feedback.
SN  - 1365-2966
SN  - 0035-8711
ER  -