Variation of the 2175 Å extinction feature in Andromeda galaxy
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911345066115072 |
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| author | Yan, Bing Wang, Shu Gao, Jian Wang, Yuxi Chen, Bingqiu |
| author_facet | Yan, Bing Wang, Shu Gao, Jian Wang, Yuxi Chen, Bingqiu |
| contents | Extinction curves contain key information on interstellar dust composition and size distribution, with the 2175 Å bump being the most prominent feature. We analyze 20 sightlines toward M31 using HST/STIS UV spectroscopy combined with multi-band photometry to characterize this feature. The extinction curves show substantial diversity, from MW-like shapes to flatter profiles with $R_V$ reaching up to $\sim5.8$. The strength of the 2175 Å feature varies widely, including two sightlines where the bump is essentially absent. The bump central wavelength spans a broader range than previously reported, while its width remains consistent with earlier studies. A moderate positive correlation is found between bump strength ($c_3$) and width ($γ$). We derive an average UV extinction curve toward M31 with $R_V \approx 3.53$. These results provide new constraints on dust properties and their spatial variations in this galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_23958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Variation of the 2175 Å extinction feature in Andromeda galaxy Yan, Bing Wang, Shu Gao, Jian Wang, Yuxi Chen, Bingqiu Astrophysics of Galaxies Extinction curves contain key information on interstellar dust composition and size distribution, with the 2175 Å bump being the most prominent feature. We analyze 20 sightlines toward M31 using HST/STIS UV spectroscopy combined with multi-band photometry to characterize this feature. The extinction curves show substantial diversity, from MW-like shapes to flatter profiles with $R_V$ reaching up to $\sim5.8$. The strength of the 2175 Å feature varies widely, including two sightlines where the bump is essentially absent. The bump central wavelength spans a broader range than previously reported, while its width remains consistent with earlier studies. A moderate positive correlation is found between bump strength ($c_3$) and width ($γ$). We derive an average UV extinction curve toward M31 with $R_V \approx 3.53$. These results provide new constraints on dust properties and their spatial variations in this galaxy. |
| title | Variation of the 2175 Å extinction feature in Andromeda galaxy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.23958 |