Strong spectral features from asymptotic giant branch stars in distant quiescent galaxies
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arXiv
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| Natura: | Preprint |
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2024
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| author | Lu, Shiying Daddi, Emanuele Maraston, Claudia Dickinson, Mark Haro, Pablo Arrabal Gobat, Raphael Renzini, Alvio Giavalisco, Mauro Bagley, Micaela B. Calabrò, Antonello Cheng, Yingjie de la Vega, Alexander D'Eugenio, Chiara Elbaz, David Finkelstein, Steven L. Gómez-Guijarro, Carlos Gu, Qiusheng Hathi, Nimish P. Huertas-Company, Marc Kartaltepe, Jeyhan S. Koekemoer, Anton M. Bail, Aurélien Le Lyu, Yipeng Magnelli, Benjamin Mobasher, Bahram Papovich, Casey Pirzkal, Nor Rich, R. Michael Tacchella, Sandro Yung, L. Y. Aaron |
| author_facet | Lu, Shiying Daddi, Emanuele Maraston, Claudia Dickinson, Mark Haro, Pablo Arrabal Gobat, Raphael Renzini, Alvio Giavalisco, Mauro Bagley, Micaela B. Calabrò, Antonello Cheng, Yingjie de la Vega, Alexander D'Eugenio, Chiara Elbaz, David Finkelstein, Steven L. Gómez-Guijarro, Carlos Gu, Qiusheng Hathi, Nimish P. Huertas-Company, Marc Kartaltepe, Jeyhan S. Koekemoer, Anton M. Bail, Aurélien Le Lyu, Yipeng Magnelli, Benjamin Mobasher, Bahram Papovich, Casey Pirzkal, Nor Rich, R. Michael Tacchella, Sandro Yung, L. Y. Aaron |
| contents | Dating the ages and weighting the stellar populations in galaxies are essential steps when studying galaxy formation through cosmic times. Evolutionary population synthesis models with different input physics are used for this purpose. Moreover, the contribution from the thermally pulsing asymptotic giant branch (TP-AGB) stellar phase, which peaks for intermediate-age 0.6-2 Gyr, has been debated for decades. Here we report the detection of strong cool-star signatures in the rest-frame near-infrared spectra of three young (~1Gyr), massive (~10^10Msun) quiescent galaxies at large look-back time, z=1-2, using JWST/NIRSpec. The coexistence of oxygen- and carbon-type absorption features, spectral edges and features from rare species, such as vanadium and possibly zirconium, reveal a strong contribution from TP-AGB stars. Population synthesis models with a significant TP-AGB contribution reproduce the observations better than those with a weak TP-AGB, which are commonly used. These findings call for revisions of published stellar population fitting results, as they point to populations with lower masses and younger ages and have further implications for cosmic dust production and chemical enrichment. New generations of improved models are needed, informed by these and future observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_07414 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strong spectral features from asymptotic giant branch stars in distant quiescent galaxies Lu, Shiying Daddi, Emanuele Maraston, Claudia Dickinson, Mark Haro, Pablo Arrabal Gobat, Raphael Renzini, Alvio Giavalisco, Mauro Bagley, Micaela B. Calabrò, Antonello Cheng, Yingjie de la Vega, Alexander D'Eugenio, Chiara Elbaz, David Finkelstein, Steven L. Gómez-Guijarro, Carlos Gu, Qiusheng Hathi, Nimish P. Huertas-Company, Marc Kartaltepe, Jeyhan S. Koekemoer, Anton M. Bail, Aurélien Le Lyu, Yipeng Magnelli, Benjamin Mobasher, Bahram Papovich, Casey Pirzkal, Nor Rich, R. Michael Tacchella, Sandro Yung, L. Y. Aaron Astrophysics of Galaxies Dating the ages and weighting the stellar populations in galaxies are essential steps when studying galaxy formation through cosmic times. Evolutionary population synthesis models with different input physics are used for this purpose. Moreover, the contribution from the thermally pulsing asymptotic giant branch (TP-AGB) stellar phase, which peaks for intermediate-age 0.6-2 Gyr, has been debated for decades. Here we report the detection of strong cool-star signatures in the rest-frame near-infrared spectra of three young (~1Gyr), massive (~10^10Msun) quiescent galaxies at large look-back time, z=1-2, using JWST/NIRSpec. The coexistence of oxygen- and carbon-type absorption features, spectral edges and features from rare species, such as vanadium and possibly zirconium, reveal a strong contribution from TP-AGB stars. Population synthesis models with a significant TP-AGB contribution reproduce the observations better than those with a weak TP-AGB, which are commonly used. These findings call for revisions of published stellar population fitting results, as they point to populations with lower masses and younger ages and have further implications for cosmic dust production and chemical enrichment. New generations of improved models are needed, informed by these and future observations. |
| title | Strong spectral features from asymptotic giant branch stars in distant quiescent galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.07414 |