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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2404.15963 |
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| _version_ | 1866910884781096960 |
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| author | Liang, Yongming Ouchi, Masami Sun, Dongsheng Kashikawa, Nobunari Cai, Zheng Cantalupo, Sebastiano Nagamine, Kentaro Yajima, Hidenobu Kirihara, Takanobu Zhang, Haibin Li, Mingyu Shimakawa, Rhythm Fan, Xiaohui Ito, Kei Tanaka, Masayuki Harikane, Yuichi Prochaska, J. Xavier Travascio, Andrea Wang, Weichen Elvis, Martin Fabbiano, Giuseppina Arita, Junya Onoue, Masafusa Silverman, John D. Shi, Dong Dong An, Fangxia Izumi, Takuma Shimasaku, Kazuhiro Uchiyama, Hisakazu Zhu, Chenghao |
| author_facet | Liang, Yongming Ouchi, Masami Sun, Dongsheng Kashikawa, Nobunari Cai, Zheng Cantalupo, Sebastiano Nagamine, Kentaro Yajima, Hidenobu Kirihara, Takanobu Zhang, Haibin Li, Mingyu Shimakawa, Rhythm Fan, Xiaohui Ito, Kei Tanaka, Masayuki Harikane, Yuichi Prochaska, J. Xavier Travascio, Andrea Wang, Weichen Elvis, Martin Fabbiano, Giuseppina Arita, Junya Onoue, Masafusa Silverman, John D. Shi, Dong Dong An, Fangxia Izumi, Takuma Shimasaku, Kazuhiro Uchiyama, Hisakazu Zhu, Chenghao |
| contents | We report the identification of a quasar overdensity in the BOSSJ0210 field, dubbed Cosmic Himalayas, consisting of 11 quasars at $z=2.16-2.20$, the densest overdensity of quasars ($17σ$) in the $\sim$10,000 deg$^2$ of the Sloan Digital Sky Survey. We present the spatial distributions of galaxies and quasars and an HI absorption map of the intergalactic medium (IGM). On the map of 465 galaxies selected from the MAMMOTH-Subaru survey, we find two galaxy density peaks that do not fall on the quasar overdensity but instead exist at the northwest and southeast sides, approximately 25 $h^{-1}$ comoving-Mpc apart from the quasar overdensity. With a spatial resolution of 15 $h^{-1}$ comoving Mpc in projection, we produce a three-dimensional HI tomography map by the IGM Ly$α$ forest in the spectra of 23 SDSS/eBOSS quasars behind the quasar overdensity. Surprisingly, the quasar overdensity coincides with neither an absorption peak nor a transmission peak of IGM HI but lies near the border separating opaque and transparent volumes, with the more luminous quasars located in an environment with lesser IGM HI. Hence remarkably, the overdensity region traced by the 11 quasars, albeit all in coherently active states, has no clear coincidence with peaks of galaxies or HI absorption densities. Current physical scenarios with mixtures of HI overdensities and quasar photoionization cannot fully interpret the emergence of Cosmic Himalayas, suggesting this peculiar structure is an excellent laboratory to unveil the interplay between galaxies, quasars, and the IGM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_15963 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg$^2$ Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI Liang, Yongming Ouchi, Masami Sun, Dongsheng Kashikawa, Nobunari Cai, Zheng Cantalupo, Sebastiano Nagamine, Kentaro Yajima, Hidenobu Kirihara, Takanobu Zhang, Haibin Li, Mingyu Shimakawa, Rhythm Fan, Xiaohui Ito, Kei Tanaka, Masayuki Harikane, Yuichi Prochaska, J. Xavier Travascio, Andrea Wang, Weichen Elvis, Martin Fabbiano, Giuseppina Arita, Junya Onoue, Masafusa Silverman, John D. Shi, Dong Dong An, Fangxia Izumi, Takuma Shimasaku, Kazuhiro Uchiyama, Hisakazu Zhu, Chenghao Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We report the identification of a quasar overdensity in the BOSSJ0210 field, dubbed Cosmic Himalayas, consisting of 11 quasars at $z=2.16-2.20$, the densest overdensity of quasars ($17σ$) in the $\sim$10,000 deg$^2$ of the Sloan Digital Sky Survey. We present the spatial distributions of galaxies and quasars and an HI absorption map of the intergalactic medium (IGM). On the map of 465 galaxies selected from the MAMMOTH-Subaru survey, we find two galaxy density peaks that do not fall on the quasar overdensity but instead exist at the northwest and southeast sides, approximately 25 $h^{-1}$ comoving-Mpc apart from the quasar overdensity. With a spatial resolution of 15 $h^{-1}$ comoving Mpc in projection, we produce a three-dimensional HI tomography map by the IGM Ly$α$ forest in the spectra of 23 SDSS/eBOSS quasars behind the quasar overdensity. Surprisingly, the quasar overdensity coincides with neither an absorption peak nor a transmission peak of IGM HI but lies near the border separating opaque and transparent volumes, with the more luminous quasars located in an environment with lesser IGM HI. Hence remarkably, the overdensity region traced by the 11 quasars, albeit all in coherently active states, has no clear coincidence with peaks of galaxies or HI absorption densities. Current physical scenarios with mixtures of HI overdensities and quasar photoionization cannot fully interpret the emergence of Cosmic Himalayas, suggesting this peculiar structure is an excellent laboratory to unveil the interplay between galaxies, quasars, and the IGM. |
| title | Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg$^2$ Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.15963 |