A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT
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2024
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| author | Zou, Siwei Cai, Zheng Wang, Feige Fan, Xiaohui Champagne, Jaclyn B. Hennawi, Joseph F. Schindler, Jan-Torge Farina, Emanuele P. Yang, Jinyi Inayoshi, Kohei Banados, Eduardo Bosman, Sarah E. I. Li, Zihao Lin, Xiaojing Wu, Yunjing Sun, Fengwu Guo, Zi-Yi Kulkarni, Girish Habouzit, Melanie Charlot, Stephane Chevallard, Jacopo Connor, Thomas Eilers, Anna-Christina Jiang, Linhua Jin, Xiangyu Kakiichi, Koki Li, Mingyu Meyer, Romain A. Walter, Fabian Zhang, Huanian |
| author_facet | Zou, Siwei Cai, Zheng Wang, Feige Fan, Xiaohui Champagne, Jaclyn B. Hennawi, Joseph F. Schindler, Jan-Torge Farina, Emanuele P. Yang, Jinyi Inayoshi, Kohei Banados, Eduardo Bosman, Sarah E. I. Li, Zihao Lin, Xiaojing Wu, Yunjing Sun, Fengwu Guo, Zi-Yi Kulkarni, Girish Habouzit, Melanie Charlot, Stephane Chevallard, Jacopo Connor, Thomas Eilers, Anna-Christina Jiang, Linhua Jin, Xiangyu Kakiichi, Koki Li, Mingyu Meyer, Romain A. Walter, Fabian Zhang, Huanian |
| contents | We characterize the multiphase circumgalactic medium and galaxy properties at z = 6.0-6.5 in four quasar fields from the James Webb Space Telescope A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE) program. We use the Very Large Telescope/X-shooter spectra of quasar J0305-3150 to identify one new metal absorber at z = 6.2713 with multiple transitions (OI, MgI, FeII and CII). They are combined with the published absorbing systems in Davies et al. (2023a) at the same redshift range to form of a sample of nine metal absorbers at z = 6.03 to 6.49. We identify eight galaxies within 1000 km s$^{-1}$ and 350 kpc around the absorbing gas from the ASPIRE spectroscopic data, with their redshifts secured by [OIII]($λλ$4959, 5007) doublets and H$β$ emission lines. Our spectral energy distribution fitting indicates that the absorbing galaxies have stellar mass ranging from 10$^{7.2}$ to 10$^{8.8}M_{\odot}$ and metallicity between 0.02 and 0.4 solar. Notably, the z = 6.2713 system in the J0305-3150 field resides in a galaxy overdensity region, which contains two (tentatively) merging galaxies within 350 kpc and seven galaxies within 1 Mpc. We measure the relative abundances of $α$ elements to iron ([$α$/Fe]) and find that the CGM gas in the most overdense region exhibits a lower [$α$/Fe] ratio. Our modeling of the galaxy's chemical abundance favors a top-heavy stellar initial mass function, and hints that we may be witnessing the contribution of the first generation Population III stars to the CGM at the end of reionization epoch. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_00113 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT Zou, Siwei Cai, Zheng Wang, Feige Fan, Xiaohui Champagne, Jaclyn B. Hennawi, Joseph F. Schindler, Jan-Torge Farina, Emanuele P. Yang, Jinyi Inayoshi, Kohei Banados, Eduardo Bosman, Sarah E. I. Li, Zihao Lin, Xiaojing Wu, Yunjing Sun, Fengwu Guo, Zi-Yi Kulkarni, Girish Habouzit, Melanie Charlot, Stephane Chevallard, Jacopo Connor, Thomas Eilers, Anna-Christina Jiang, Linhua Jin, Xiangyu Kakiichi, Koki Li, Mingyu Meyer, Romain A. Walter, Fabian Zhang, Huanian Astrophysics of Galaxies We characterize the multiphase circumgalactic medium and galaxy properties at z = 6.0-6.5 in four quasar fields from the James Webb Space Telescope A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE) program. We use the Very Large Telescope/X-shooter spectra of quasar J0305-3150 to identify one new metal absorber at z = 6.2713 with multiple transitions (OI, MgI, FeII and CII). They are combined with the published absorbing systems in Davies et al. (2023a) at the same redshift range to form of a sample of nine metal absorbers at z = 6.03 to 6.49. We identify eight galaxies within 1000 km s$^{-1}$ and 350 kpc around the absorbing gas from the ASPIRE spectroscopic data, with their redshifts secured by [OIII]($λλ$4959, 5007) doublets and H$β$ emission lines. Our spectral energy distribution fitting indicates that the absorbing galaxies have stellar mass ranging from 10$^{7.2}$ to 10$^{8.8}M_{\odot}$ and metallicity between 0.02 and 0.4 solar. Notably, the z = 6.2713 system in the J0305-3150 field resides in a galaxy overdensity region, which contains two (tentatively) merging galaxies within 350 kpc and seven galaxies within 1 Mpc. We measure the relative abundances of $α$ elements to iron ([$α$/Fe]) and find that the CGM gas in the most overdense region exhibits a lower [$α$/Fe] ratio. Our modeling of the galaxy's chemical abundance favors a top-heavy stellar initial mass function, and hints that we may be witnessing the contribution of the first generation Population III stars to the CGM at the end of reionization epoch. |
| title | A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.00113 |