JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization

Zhiyuan Ma et al.

Detalles Bibliográficos
Autores: Ma, Zhiyuan, Diego, José María, Windhorst, Rogier A., Coe, Dan
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/374173
Acceso en línea:http://hdl.handle.net/10261/374173
Access Level:acceso abierto
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dc.title.none.fl_str_mv JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
title JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
spellingShingle JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
Ma, Zhiyuan
title_short JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
title_full JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
title_fullStr JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
title_full_unstemmed JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
title_sort JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for Reionization
dc.creator.none.fl_str_mv Ma, Zhiyuan
Diego, José María
Windhorst, Rogier A.
Coe, Dan
author Ma, Zhiyuan
author_facet Ma, Zhiyuan
Diego, José María
Windhorst, Rogier A.
Coe, Dan
author_role author
author2 Diego, José María
Windhorst, Rogier A.
Coe, Dan
author2_role author
author
author
dc.contributor.none.fl_str_mv National Science Foundation (US)
National Natural Science Foundation of China
NASA
Agencia Estatal de Investigación (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Junta de Andalucía
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description Zhiyuan Ma et al.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/374173
url http://hdl.handle.net/10261/374173
dc.language.none.fl_str_mv Inglés
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-113689GB-I00
https://doi.org/10.3847/1538-4357/ad7b32
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dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
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spelling JWST View of Four Infant Galaxies at z = 8.31-8.49 in the MACS J0416.1−2403 Field and Implications for ReionizationMa, ZhiyuanDiego, José MaríaWindhorst, Rogier A.Coe, DanZhiyuan Ma et al.New JWST/NIRCam wide-field slitless spectroscopy provides redshifts for four z>8 galaxies located behind the lensing cluster MACS J0416.1−2403. Two of them, “Y1” and “JD,” have previously reported spectroscopic redshifts based on Atacama Large Millimeter/submillimeter Array measurements of [OIII] 88 μmand/or [CII] 157.7 μm lines. Y1 is a merging system of three components, and the existing redshift z = 8.31 is confirmed. However, JD is at z =8.34 instead of the previously claimed z=9.28. JD’s close companion, “JD-N,” which was a previously discovered z >8 candidate, is now identified at the same redshift as JD. JD and JD-N form an interacting pair. A new candidate at z >8, “f090d_018,” is also confirmed and is at z=8.49. These four objects are likely part of an overdensity that signposts a large structure extending ∼165 kpc in projected distance and ∼48.7 Mpc in radial distance. They are magnified by less than 1 mag and have an intrinsic MUV ranging from −19.57 to −20.83 mag. Their spectral energy distributions show that the galaxies are all very young with ages∼ 4–18 Myr and stellar masses of about 107–8 Me. These infant galaxies have very different star formation rates ranging from a few to over a hundred solar masses per year, but only two of them (JD and f090d_018) have blue rest-frame UV slopes β<−2.0 indicative of a high Lyman-continuum photon escape fraction that could contribute significantly to the cosmic hydrogen-reionizing background. Interestingly, these two galaxies are the least massive and least active ones among the four. The other two systems have much flatter UV slopes largely because of their high dust extinction (AV =0.9–1.0 mag). Their much lower indicated escape fractions show that even very young, actively star-forming galaxies can have a negligible contribution to reionization when they quickly form dust throughout their bodies.Z.M. is supported by the NSF grants No. 1636621, 2034318, and 2307448. C.C. is supported by the National Natural Science Foundation of China, Nos. 11933003 and 12173045, as well as the CAS through a grant to the CAS South America Center for Astronomy (CASSACA). B.S. and H.Y. acknowledge the support from the NSF grant AST-2307447 and the University of Missouri Research Council grant URC-23-029. S.H.C., R.A.W., and R.A.J. acknowledge support from NASA JWST Interdisciplinary Scientist grants NAG5-12460, NNX14AN10G, and 80NSSC18K0200 from GSFC. F.S. and C.N.A.W. acknowledge funding from the JWST/NIRCam contract NASS-0215 to the University of Arizona. F.S. acknowledges support for program #2883 provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127. D.E. acknowledges support from a Beatriz Galindo senior fellowship (BG20/00224) from the Spanish Ministry of Science and Innovation, projects PID2020-114414GB-100 and PID2020-113689GB-I00 financed by MCIN/AEI/10.13039/501100011033, project P20-00334 financed by the Junta de Andalucía, and project A-FQM-510-UGR20 of the FEDER/Junta de Andalucía-Consejería de Transformación Económica, Industria, Consejerá Universidades.Peer reviewedIOP PublishingNational Science Foundation (US)National Natural Science Foundation of ChinaNASAAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)Junta de AndalucíaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/374173reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-114414GB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-113689GB-I00https://doi.org/10.3847/1538-4357/ad7b32Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3741732026-05-22T06:33:51Z
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