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Strong spectral features from asymptotic giant branch stars in distant quiescent 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...

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Published in:arXiv.org 2024-11
Main Authors: Lu, Shiying, Daddi, Emanuele, Maraston, Claudia, Dickinson, Mark, Pablo Arrabal Haro, 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, Aurélien Le Bail, Lyu, Yipeng, Magnelli, Benjamin, Mobasher, Bahram, Papovich, Casey, Pirzkal, Nor, Rich, R Michael, Tacchella, Sandro, Yung, L Y Aaron
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container_title arXiv.org
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creator Lu, Shiying
Daddi, Emanuele
Maraston, Claudia
Dickinson, Mark
Pablo Arrabal Haro
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
Aurélien Le Bail
Lyu, Yipeng
Magnelli, Benjamin
Mobasher, Bahram
Papovich, Casey
Pirzkal, Nor
Rich, R Michael
Tacchella, Sandro
Yung, L Y Aaron
description 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.
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subjects Astronomical models
Asymptotic giant branch stars
Cool stars
Cosmic dust
Galactic evolution
Galaxies
Infrared signatures
Infrared spectra
Near infrared radiation
Star & galaxy formation
Stars & galaxies
Stellar populations
Synthesis
Zirconium
title Strong spectral features from asymptotic giant branch stars in distant quiescent galaxies
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