The host galaxies of radio-loud quasars at z>5 with ALMA
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Mazzucchelli, C. Decarli, R. Belladitta, S. Bañados, E. Meyer, R. A. Connor, T. Momjian, E. Rojas-Ruiz, S. Eilers, A. -C. Khusanova, Y. Farina, E. P. Drake, A. B. Walter, F. Wang, F. Onoue, M. Venemans, B. P. |
| author_facet | Mazzucchelli, C. Decarli, R. Belladitta, S. Bañados, E. Meyer, R. A. Connor, T. Momjian, E. Rojas-Ruiz, S. Eilers, A. -C. Khusanova, Y. Farina, E. P. Drake, A. B. Walter, F. Wang, F. Onoue, M. Venemans, B. P. |
| contents | The interaction between radio-jets and quasar host galaxies plays a paramount role in quasar/galaxy co-evolution. However, very little has been known so far about this interaction at very high-z. Here, we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations in Band 7 and Band 3 of six radio-loud quasars' host galaxies at $z > 5$. We recover [CII] 158 $μ$m line and underlying dust continuum emission at $>2σ$ for five sources, while we obtain upper limits for the CO(6-5) emission line and continuum for the remaining source. At the spatial resolution of our observations ($\sim$1.0"-1.4"), we do not recover perturbed/extended morphologies or kinematics, signatures of potential mergers. These galaxies already host large quantities of gas, with [CII]-based star formation rates of $30-400 M_{\odot} $yr$^{-1}$. Building their radio/sub-mm spectral energy distributions (SEDs), we find that in at least four cases the 1mm continuum intensity arises from a combination of synchrotron and dust emission, with an initial estimation of synchrotron contribution at 300 GHz of $\gtrsim$10%. We compare the properties of the sources inspected here with a large collection of radio-quiet sources from the literature, as well as a sample of radio-loud quasars from previous studies, at comparable redshift. We recover a potential mild decrease in $L_{\rm [CII]}$ for the radio-loud sources, which might be due to a suppression of the cool gas emission due to the radio-jets. We do not find any [CII]-emitting companion galaxy candidate around the five radio-loud quasars observed in Band 7: given the depth of our dataset, this result is still consistent with that observed around radio-quiet quasars. Further higher-spatial resolution observations, over a larger frequency range, of high-z radio-loud quasars hosts will allow for a better understanding of the physics of such sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11952 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The host galaxies of radio-loud quasars at z>5 with ALMA Mazzucchelli, C. Decarli, R. Belladitta, S. Bañados, E. Meyer, R. A. Connor, T. Momjian, E. Rojas-Ruiz, S. Eilers, A. -C. Khusanova, Y. Farina, E. P. Drake, A. B. Walter, F. Wang, F. Onoue, M. Venemans, B. P. Astrophysics of Galaxies The interaction between radio-jets and quasar host galaxies plays a paramount role in quasar/galaxy co-evolution. However, very little has been known so far about this interaction at very high-z. Here, we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations in Band 7 and Band 3 of six radio-loud quasars' host galaxies at $z > 5$. We recover [CII] 158 $μ$m line and underlying dust continuum emission at $>2σ$ for five sources, while we obtain upper limits for the CO(6-5) emission line and continuum for the remaining source. At the spatial resolution of our observations ($\sim$1.0"-1.4"), we do not recover perturbed/extended morphologies or kinematics, signatures of potential mergers. These galaxies already host large quantities of gas, with [CII]-based star formation rates of $30-400 M_{\odot} $yr$^{-1}$. Building their radio/sub-mm spectral energy distributions (SEDs), we find that in at least four cases the 1mm continuum intensity arises from a combination of synchrotron and dust emission, with an initial estimation of synchrotron contribution at 300 GHz of $\gtrsim$10%. We compare the properties of the sources inspected here with a large collection of radio-quiet sources from the literature, as well as a sample of radio-loud quasars from previous studies, at comparable redshift. We recover a potential mild decrease in $L_{\rm [CII]}$ for the radio-loud sources, which might be due to a suppression of the cool gas emission due to the radio-jets. We do not find any [CII]-emitting companion galaxy candidate around the five radio-loud quasars observed in Band 7: given the depth of our dataset, this result is still consistent with that observed around radio-quiet quasars. Further higher-spatial resolution observations, over a larger frequency range, of high-z radio-loud quasars hosts will allow for a better understanding of the physics of such sources. |
| title | The host galaxies of radio-loud quasars at z>5 with ALMA |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.11952 |