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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.21321 |
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| _version_ | 1866913914087800832 |
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| author | Cheng, Cheng Huang, Jia-Sheng Wei, Peng Esamdin, Ali Feng, Guojie Zhang, Zhi-Xiang Yan, Haojing Du, Wei Zuo, Pei Li, Zi-Jian Orellana, Gustavo Wang, Letian Wang, Yong Iskandar, Abdusamatjan Yaqup, Shahidin |
| author_facet | Cheng, Cheng Huang, Jia-Sheng Wei, Peng Esamdin, Ali Feng, Guojie Zhang, Zhi-Xiang Yan, Haojing Du, Wei Zuo, Pei Li, Zi-Jian Orellana, Gustavo Wang, Letian Wang, Yong Iskandar, Abdusamatjan Yaqup, Shahidin |
| contents | We present first-light deep H$α$ imaging taken with the Nanshan 1-meter wide-field telescope on the local galaxy NGC 4258, alongside archival data from Hubble Space telescope (HST), Westerbork Synthesis Radio Telescope, and The Dark Energy Camera Legacy Survey. The H$α$ image shows ongoing star formation not only inside the galaxy but also in an HI cloud in the eastern HI tail, which is roughly 16 kpc away from the main galaxy. The HST images reveal several ultra-blue compact objects ($\rm F555W - F814W <-0.5 mag,\, FWHM\sim 0.2''$) in the H$α$ bright region, aligned with the HI tail, suggesting the presence of young open cluster candidate in the HI tail. Our results suggest that wide field H$α$ imaging is a valuable tool for investigating recent star formation in the extended regions of NGC 4258. Furthermore, the star formation in diffuse HI tails could highlight an potential aspect of galaxy stellar halo formation, warranting further investigation of the impact of star formation in halos on galaxy evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21321 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An H$α$ Cloud in the HI Tail: Recent Star Formation in the Outskirts of NGC 4258 Revealed by Nanshan 1-m Telescope Cheng, Cheng Huang, Jia-Sheng Wei, Peng Esamdin, Ali Feng, Guojie Zhang, Zhi-Xiang Yan, Haojing Du, Wei Zuo, Pei Li, Zi-Jian Orellana, Gustavo Wang, Letian Wang, Yong Iskandar, Abdusamatjan Yaqup, Shahidin Astrophysics of Galaxies We present first-light deep H$α$ imaging taken with the Nanshan 1-meter wide-field telescope on the local galaxy NGC 4258, alongside archival data from Hubble Space telescope (HST), Westerbork Synthesis Radio Telescope, and The Dark Energy Camera Legacy Survey. The H$α$ image shows ongoing star formation not only inside the galaxy but also in an HI cloud in the eastern HI tail, which is roughly 16 kpc away from the main galaxy. The HST images reveal several ultra-blue compact objects ($\rm F555W - F814W <-0.5 mag,\, FWHM\sim 0.2''$) in the H$α$ bright region, aligned with the HI tail, suggesting the presence of young open cluster candidate in the HI tail. Our results suggest that wide field H$α$ imaging is a valuable tool for investigating recent star formation in the extended regions of NGC 4258. Furthermore, the star formation in diffuse HI tails could highlight an potential aspect of galaxy stellar halo formation, warranting further investigation of the impact of star formation in halos on galaxy evolution. |
| title | An H$α$ Cloud in the HI Tail: Recent Star Formation in the Outskirts of NGC 4258 Revealed by Nanshan 1-m Telescope |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.21321 |