Warm Gas in the Vicinity of a Supermassive Black hole 13 Billion Years Ago
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917950994251776 |
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| author | Tadaki, Ken-ichi Esposito, Federico Vallini, Livia Tsukui, Takafumi Saito, Toshiki Iono, Daisuke Michiyama, Tomonari |
| author_facet | Tadaki, Ken-ichi Esposito, Federico Vallini, Livia Tsukui, Takafumi Saito, Toshiki Iono, Daisuke Michiyama, Tomonari |
| contents | Quasars, powered by supermassive black holes (SMBH), are among the brightest objects in the universe. In the vicinity of an SMBH, X-ray photons from an active galactic nucleus (AGN) can heat the surrounding gas to several hundred kelvin. Here we report observations of dust continuum and CO J=13-12 and J=14-13 line emissions at a resolution of 130 parsecs in a luminous quasar at z=6. We successfully detected these high-J CO line emissions from warm gas in a compact disk component. The CO luminosity ratio in the central region of the compact disk is consistent with theoretical models in which X-ray heating dominates the CO excitation and the gas column density is as high as 10$^{25}$ cm$^{-2}$. This demonstrates that high-resolution observations of high-J CO lines are promising ways to identify extremely dust-obscured quasars in the early universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07964 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Warm Gas in the Vicinity of a Supermassive Black hole 13 Billion Years Ago Tadaki, Ken-ichi Esposito, Federico Vallini, Livia Tsukui, Takafumi Saito, Toshiki Iono, Daisuke Michiyama, Tomonari Astrophysics of Galaxies Quasars, powered by supermassive black holes (SMBH), are among the brightest objects in the universe. In the vicinity of an SMBH, X-ray photons from an active galactic nucleus (AGN) can heat the surrounding gas to several hundred kelvin. Here we report observations of dust continuum and CO J=13-12 and J=14-13 line emissions at a resolution of 130 parsecs in a luminous quasar at z=6. We successfully detected these high-J CO line emissions from warm gas in a compact disk component. The CO luminosity ratio in the central region of the compact disk is consistent with theoretical models in which X-ray heating dominates the CO excitation and the gas column density is as high as 10$^{25}$ cm$^{-2}$. This demonstrates that high-resolution observations of high-J CO lines are promising ways to identify extremely dust-obscured quasars in the early universe. |
| title | Warm Gas in the Vicinity of a Supermassive Black hole 13 Billion Years Ago |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.07964 |