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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.16990 |
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| _version_ | 1866913668484038656 |
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| author | Bakis, Hicran Aktekin, Ebru Bakis, Volkan Sano, Hidetoshi Sezer, Aytap |
| author_facet | Bakis, Hicran Aktekin, Ebru Bakis, Volkan Sano, Hidetoshi Sezer, Aytap |
| contents | The shell-type supernova remnant (SNR) G206.7+5.9 was recently discovered in the radio band with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The remnant spans about 3.5 in diameter and exhibits bilateral shells. In this work, we present optical spectra of G206.7+5.9 with the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST), and narrow-band (H$α$ and [SII]) images with the 1-m T100 telescope. The filamentary structure seen in H$α$ image shows a clear correlation with the radio emission. We use optical line ratios to determine the physical parameters of G206.7+5.9. The LAMOST spectra reveal large ratios of [SII]/H$α$ $\sim$ (0.61-1.78) and [NII]/H$α$ $\sim$ (0.63-1.92) consistent with that expected for a shock-heated SNR. The emission lines [OI] $λ$6300, $λ$6363 detected in the spectra also support the presence of shocks. Electron density ($n_{\rm e}$) measurements based on the [SII] $λ$6716/$λ$6731 ratio suggest densities between 117 and 597 cm$^{-3}$. We estimate the pre-shock cloud density ($n_{\rm c}$) to be approximately 2.6$-$13.3 cm$^{-3}$. We also investigate the archival HI data and have newly identified an expanding gas motion of the HI, whose velocity span is approximately 10 km s$^{-1}$. We conclude that G206.7+5.9 is an SNR exhibiting properties remarkably similar to those seen in Galactic SNRs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16990 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical investigation of supernova remnant G206.7+5.9 Bakis, Hicran Aktekin, Ebru Bakis, Volkan Sano, Hidetoshi Sezer, Aytap High Energy Astrophysical Phenomena Astrophysics of Galaxies The shell-type supernova remnant (SNR) G206.7+5.9 was recently discovered in the radio band with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The remnant spans about 3.5 in diameter and exhibits bilateral shells. In this work, we present optical spectra of G206.7+5.9 with the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST), and narrow-band (H$α$ and [SII]) images with the 1-m T100 telescope. The filamentary structure seen in H$α$ image shows a clear correlation with the radio emission. We use optical line ratios to determine the physical parameters of G206.7+5.9. The LAMOST spectra reveal large ratios of [SII]/H$α$ $\sim$ (0.61-1.78) and [NII]/H$α$ $\sim$ (0.63-1.92) consistent with that expected for a shock-heated SNR. The emission lines [OI] $λ$6300, $λ$6363 detected in the spectra also support the presence of shocks. Electron density ($n_{\rm e}$) measurements based on the [SII] $λ$6716/$λ$6731 ratio suggest densities between 117 and 597 cm$^{-3}$. We estimate the pre-shock cloud density ($n_{\rm c}$) to be approximately 2.6$-$13.3 cm$^{-3}$. We also investigate the archival HI data and have newly identified an expanding gas motion of the HI, whose velocity span is approximately 10 km s$^{-1}$. We conclude that G206.7+5.9 is an SNR exhibiting properties remarkably similar to those seen in Galactic SNRs. |
| title | Optical investigation of supernova remnant G206.7+5.9 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.16990 |