An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917724810117120 |
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| author | Zhang, Ruoyi Yuan, Haibo Huang, Bowen Wang, Tao Yang, Lin Green, Gregory M. Zhang, Xiangyu |
| author_facet | Zhang, Ruoyi Yuan, Haibo Huang, Bowen Wang, Tao Yang, Lin Green, Gregory M. Zhang, Xiangyu |
| contents | We present a direct measurement of extinction curves using corrected $Gaia$ XP spectra of the common sources in $Gaia$ DR3 and LAMOST DR7. Our analysis of approximately 370 thousand high-quality samples yielded a high-precision average extinction curve for the Milky Way. After incorporating infrared photometric data from 2MASS and WISE, the extinction curve spans wavelengths from 0.336 to 4.6 $μ$m. We determine an average $R_{55}$ of $2.730 \pm 0.007$, corresponding to $R_V= 3.073 \pm 0.009$, and a near-infrared power-law index $α$ of $1.935 \pm 0.037$. Our study confirmed some intermediate-scale structures within the optical range. Two new features were identified at 540 and 769 nm, and their intensities exhibited a correlation with extinction and $R_V$. This extinction curve can be used to investigate the characteristics of dust and enhance the extinction correction of Milky Way stars. A Python package for this extinction curve is available. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_12386 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST Zhang, Ruoyi Yuan, Haibo Huang, Bowen Wang, Tao Yang, Lin Green, Gregory M. Zhang, Xiangyu Astrophysics of Galaxies We present a direct measurement of extinction curves using corrected $Gaia$ XP spectra of the common sources in $Gaia$ DR3 and LAMOST DR7. Our analysis of approximately 370 thousand high-quality samples yielded a high-precision average extinction curve for the Milky Way. After incorporating infrared photometric data from 2MASS and WISE, the extinction curve spans wavelengths from 0.336 to 4.6 $μ$m. We determine an average $R_{55}$ of $2.730 \pm 0.007$, corresponding to $R_V= 3.073 \pm 0.009$, and a near-infrared power-law index $α$ of $1.935 \pm 0.037$. Our study confirmed some intermediate-scale structures within the optical range. Two new features were identified at 540 and 769 nm, and their intensities exhibited a correlation with extinction and $R_V$. This extinction curve can be used to investigate the characteristics of dust and enhance the extinction correction of Milky Way stars. A Python package for this extinction curve is available. |
| title | An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.12386 |