Diverse molecular gas excitations in quasar host galaxies at z \sim 6
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2024
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| author | Li, Jianan Wang, Ran Pensabene, Antonio Walter, Fabian Venemans, Bram P. Decarli, Roberto Bañados, Eduardo Cox, Pierre Neri, Roberto Omont, Alain Cai, Zheng Khusanova, Yana Xu, Fuxiang Riechers, Dominik wagg, Jeff Shao, Yali Liu, Yuanqi Menten, Karl M. Li, Qiong Fan, Xiaohui |
| author_facet | Li, Jianan Wang, Ran Pensabene, Antonio Walter, Fabian Venemans, Bram P. Decarli, Roberto Bañados, Eduardo Cox, Pierre Neri, Roberto Omont, Alain Cai, Zheng Khusanova, Yana Xu, Fuxiang Riechers, Dominik wagg, Jeff Shao, Yali Liu, Yuanqi Menten, Karl M. Li, Qiong Fan, Xiaohui |
| contents | We present observations using the NOrthern Extended Millimetre Array (NOEMA) of CO and $\rm H_{2}O$ emission lines, and the underlying dust continuum in two quasars at $z \sim 6$, i.e., P215-16 at $z$ = 5.78 and J1429+5447 at $z$ = 6.18. Notably, among all published CO SLEDs of quasars at $z \sim 6$, the two systems reveal the highest and the lowest CO level of excitation, respectively. Our radiative transfer modeling of the CO SLED of P215-16 suggests that the molecular gas heated by AGN could be a plausible origin for the high CO excitation. For J1429+5447, we obtain the first well-sampled CO SLED (from transitions from 2-1 to 10-9) of a radio-loud quasar at $z\gtrsim 6$. Analysis of the CO SLED suggests that a single photo-dissociation region (PDR) component could explain the CO excitation in the radio-loud quasar J1429+5447. This work highlights the utility of the CO SLED in uncovering the ISM properties in these young quasar-starburst systems at the highest redshift. The diversity of the CO SLEDs reveals the complexities in gas conditions and excitation mechanisms at their early evolutionary stage. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_04590 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Diverse molecular gas excitations in quasar host galaxies at z \sim 6 Li, Jianan Wang, Ran Pensabene, Antonio Walter, Fabian Venemans, Bram P. Decarli, Roberto Bañados, Eduardo Cox, Pierre Neri, Roberto Omont, Alain Cai, Zheng Khusanova, Yana Xu, Fuxiang Riechers, Dominik wagg, Jeff Shao, Yali Liu, Yuanqi Menten, Karl M. Li, Qiong Fan, Xiaohui Astrophysics of Galaxies We present observations using the NOrthern Extended Millimetre Array (NOEMA) of CO and $\rm H_{2}O$ emission lines, and the underlying dust continuum in two quasars at $z \sim 6$, i.e., P215-16 at $z$ = 5.78 and J1429+5447 at $z$ = 6.18. Notably, among all published CO SLEDs of quasars at $z \sim 6$, the two systems reveal the highest and the lowest CO level of excitation, respectively. Our radiative transfer modeling of the CO SLED of P215-16 suggests that the molecular gas heated by AGN could be a plausible origin for the high CO excitation. For J1429+5447, we obtain the first well-sampled CO SLED (from transitions from 2-1 to 10-9) of a radio-loud quasar at $z\gtrsim 6$. Analysis of the CO SLED suggests that a single photo-dissociation region (PDR) component could explain the CO excitation in the radio-loud quasar J1429+5447. This work highlights the utility of the CO SLED in uncovering the ISM properties in these young quasar-starburst systems at the highest redshift. The diversity of the CO SLEDs reveals the complexities in gas conditions and excitation mechanisms at their early evolutionary stage. |
| title | Diverse molecular gas excitations in quasar host galaxies at z \sim 6 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.04590 |