Two Lensed Star Candidates at z ≃ 4.8 behind the Galaxy Cluster MACS J0647.7+7015
dc.contributor.author | Meena, Ashish Kumar | |
dc.contributor.author | Zitrin, Adi | |
dc.contributor.author | Jiménez Teja, Yolanda | |
dc.contributor.author | Zackrisson, Erik | |
dc.contributor.author | Chen, Wenlei | |
dc.contributor.author | Coe, Dan | |
dc.contributor.author | Diego, José | |
dc.contributor.author | Dimauro, Paola | |
dc.contributor.author | Furtak, Lukas J. | |
dc.contributor.author | Kelly, Patrick L. | |
dc.contributor.author | Oguri, Masamune | |
dc.contributor.author | Welch, Brian | |
dc.contributor.author | Abdurro'uf | |
dc.contributor.author | Andrade Santos, Felipe | |
dc.contributor.author | Adamo, Angela | |
dc.contributor.author | Bhatawdekar, Rachana | |
dc.contributor.author | Bradac, Marusa | |
dc.contributor.author | Bradley, Larry | |
dc.contributor.author | Broadhurst, Thomas | |
dc.contributor.author | Conselice, Christopher J. | |
dc.contributor.author | Dayal, Pratika | |
dc.contributor.author | Donahue, Megan | |
dc.contributor.author | Frye, Brenda L. | |
dc.contributor.author | Fujimoto, Seiji | |
dc.contributor.author | Hsiao, Tiger Yu-Yang | |
dc.contributor.author | Kokorev, Vasily | |
dc.contributor.author | Mahler, Guillaume | |
dc.contributor.author | Vanzella, Eros | |
dc.contributor.author | Windhorst, Rogier A. | |
dc.date.accessioned | 2023-05-04T16:58:55Z | |
dc.date.available | 2023-05-04T16:58:55Z | |
dc.date.issued | 2023-02 | |
dc.identifier.citation | The Astrophysical Journal Letters 944(1) : (2023) // Article ID L6 | es_ES |
dc.identifier.issn | 2041-8205 | |
dc.identifier.issn | 2041-8213 | |
dc.identifier.uri | http://hdl.handle.net/10810/61038 | |
dc.description.abstract | We report the discovery of two extremely magnified lensed star candidates behind the galaxy cluster MACS J0647.7+015 using recent multiband James Webb Space Telescope (JWST) NIRCam observations. The star candidates are seen in a previously known, zphot ≃ 4.8 dropout giant arc that straddles the critical curve. The candidates lie near the expected critical curve position, but lack clear counter-images on the other side of it, suggesting these are possibly stars undergoing caustic crossings. We present revised lensing models for the cluster, including multiply imaged galaxies newly identified in the JWST data, and use them to estimate background macro-magnifications of at least ≳90 and ≳50 at the positions of the two candidates, respectively. With these values, we expect effective, caustic-crossing magnifications of ∼[103–105] for the two star candidates. The spectral energy distributions of the two candidates match well the spectra of B-type stars with best-fit surface temperatures of ∼10,000 K, and ∼12,000 K, respectively, and we show that such stars with masses ≳20 M⊙ and ≳50 M⊙, respectively, can become sufficiently magnified to be observable. We briefly discuss other alternative explanations and conclude that these objects are likely lensed stars, but also acknowledge that the less-magnified candidate may alternatively reside in a star cluster. These star candidates constitute the second highest-redshift examples to date after Earendel at zphot ≃ 6.2, establishing further the potential of studying extremely magnified stars at high redshifts with JWST. Planned future observations, including with NIRSpec, will enable a more detailed view of these candidates in the near future. | es_ES |
dc.description.sponsorship | A.K.M., A.Z., and L.J.F. acknowledge support from grant 2020750 from the United States-Israel Binational Science Foundation (BSF) and grant 2109066 from the United States National Science Foundation (NSF), and by the Ministry of Science & Technology, Israel. Y.J.-T. acknowledges financial support from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 898633, the MSCA IF Extensions Program of the Spanish National Research Council (CSIC), and the State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa award to the Instituto de Astrofisica de Andalucia (SEV-2017-0709). E.Z. acknowledges funding from the Swedish National Space Agency. J.M.D. acknowledges the support of projects PGC2018-101814-B-100 and MDM-2017-0765. B.W. acknowledges support from NASA under award No. 80GSFC21M0002. A.A. acknowledges support from the Swedish Research Council (Vetenskapsradet project grants 2021-05559). R.A.B gratefully acknowledges support from the European Space Agency (ESA) Research Fellowship. M.B. acknowledges support from the Slovenian national research agency ARRS through grant N1-0238. P.D. acknowledges support from the NWO grant 016.VIDI.189.162 ("ODIN") and from the European Commission's and University of Groningen's CO-FUND Rosalind Franklin program. G.M. acknowledges funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. MARACHAS-DLV-896778. R.A.W. acknowledges support from NASA JWST Interdisciplinary Scientist grants NAG5-12460, NNX14AN10G and 80NSSC18K0200 from GSFC. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | IOP | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/2020/898633 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MICIU/SEV-2017-0709 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MICIU/PGC2018-101814-B-100 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MICIU/MDM-2017-0765 | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/2020/896778 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.title | Two Lensed Star Candidates at z ≃ 4.8 behind the Galaxy Cluster MACS J0647.7+7015 | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | © 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. | es_ES |
dc.rights.holder | Atribución 3.0 España | * |
dc.relation.publisherversion | https://iopscience.iop.org/article/10.3847/2041-8213/acb645 | es_ES |
dc.identifier.doi | 10.3847/2041-8213/acb645 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Física | es_ES |
dc.departamentoeu | Fisika | es_ES |
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Except where otherwise noted, this item's license is described as © 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.