Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies
The extreme magnification from galaxy clusters and microlenses therein allows for the detection of individual, luminous stars in lensed galaxies as transient events, and hence provides a valuable window into the high-mass stellar population in z > 1 galaxies. As these bright stars can only be for...
| Autores: | , , , , , , , , , , |
|---|---|
| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/424289 |
| Acesso em linha: | http://hdl.handle.net/10261/424289 |
| Access Level: | acceso abierto |
| Palavra-chave: | Gravitational lensing: strong Galaxies: star formation Gravitational lensing: micro |
| id |
ES_b10bdeee8f954db1543d56d995fb99ea |
|---|---|
| oai_identifier_str |
oai:digital.csic.es:10261/424289 |
| network_acronym_str |
ES |
| network_name_str |
España |
| repository_id_str |
|
| dc.title.none.fl_str_mv |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| title |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| spellingShingle |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies Li, Sung Kei Gravitational lensing: strong Galaxies: star formation Gravitational lensing: micro |
| title_short |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| title_full |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| title_fullStr |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| title_full_unstemmed |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| title_sort |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxies |
| dc.creator.none.fl_str_mv |
Li, Sung Kei Palencia, Jose María Diego, José María Lim, Jeremy Kelly, Patrick L. Meena, Ashish Kumar Nianias, James Williams, Hayley Williams, Liliya L. R. Zitrin, Adi Broadhurst, Tom |
| author |
Li, Sung Kei |
| author_facet |
Li, Sung Kei Palencia, Jose María Diego, José María Lim, Jeremy Kelly, Patrick L. Meena, Ashish Kumar Nianias, James Williams, Hayley Williams, Liliya L. R. Zitrin, Adi Broadhurst, Tom |
| author_role |
author |
| author2 |
Palencia, Jose María Diego, José María Lim, Jeremy Kelly, Patrick L. Meena, Ashish Kumar Nianias, James Williams, Hayley Williams, Liliya L. R. Zitrin, Adi Broadhurst, Tom |
| author2_role |
author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Research Grants Council (Hong Kong) Collaborative Research Fund (Hong Kong) Agencia Estatal de Investigación (España) Ministerio de Ciencia, Innovación y Universidades (España) National Science Foundation (US) NASA The University of Hong Kong United States-Israel Binational Science Foundation Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Gravitational lensing: strong Galaxies: star formation Gravitational lensing: micro |
| topic |
Gravitational lensing: strong Galaxies: star formation Gravitational lensing: micro |
| description |
The extreme magnification from galaxy clusters and microlenses therein allows for the detection of individual, luminous stars in lensed galaxies as transient events, and hence provides a valuable window into the high-mass stellar population in z > 1 galaxies. As these bright stars can only be formed at specific ages, the relative abundance of transient events at blue (B) and red (R) optical and near-infrared wavelengths (B=R ratio) can provide insights into the recent star formation history of galaxies that are not well constrained by their spectral energy distributions (SEDs). Here, we forward model the transient detection rates in an idealized mock scenario to find that the B=R ratio of strongly lensed z > 1 galaxies decreases quickly with increasing age. This ratio has a moderate sensitivity to metallicity and a comparatively low sensitivity to dust attenuation, with no significant dependency on the stellar initial mass function. Fitting model stellar populations to either the SED or B=R ratio alone of the “Warhol” arc (z = 0:94), we find that neither a simple single starburst nor more complex star formation can simultaneously reproduce both constraints.We then demonstrate that a best-fit model constrained by both the B=R ratio and SED requires a star formation rate that has varied quite dramatically over the past -50 Myr, for which the total stellar mass formed over this time is a factor of 10 (with 2 - 3o significance) different from the best-fit models to the SED alone. Our work shows that the transient B=R ratio can be used as an additional powerful constraint on the recent star formation history of higher-redshift galaxies in future works that are strongly lensed by galaxy clusters. |
| publishDate |
2025 |
| dc.date.none.fl_str_mv |
2025 2026 2026 |
| 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 |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/424289 |
| url |
http://hdl.handle.net/10261/424289 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
#PLACEHOLDER_PARENT_METADATA_VALUE# #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/PRE2020-096261 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/MDM-2017-0765 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-138896NB-C51 https://doi.org/10.1051/0004-6361/202556037 Sí |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
EDP Sciences |
| publisher.none.fl_str_mv |
EDP Sciences |
| dc.source.none.fl_str_mv |
reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
| instname_str |
Consejo Superior de Investigaciones Científicas (CSIC) |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| collection |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
|
| _version_ |
1869416877708541952 |
| spelling |
Transient star blue-to-red ratio and star formation history in z ≳ 1 lensed galaxiesLi, Sung KeiPalencia, Jose MaríaDiego, José MaríaLim, JeremyKelly, Patrick L.Meena, Ashish KumarNianias, JamesWilliams, HayleyWilliams, Liliya L. R.Zitrin, AdiBroadhurst, TomGravitational lensing: strongGalaxies: star formationGravitational lensing: microThe extreme magnification from galaxy clusters and microlenses therein allows for the detection of individual, luminous stars in lensed galaxies as transient events, and hence provides a valuable window into the high-mass stellar population in z > 1 galaxies. As these bright stars can only be formed at specific ages, the relative abundance of transient events at blue (B) and red (R) optical and near-infrared wavelengths (B=R ratio) can provide insights into the recent star formation history of galaxies that are not well constrained by their spectral energy distributions (SEDs). Here, we forward model the transient detection rates in an idealized mock scenario to find that the B=R ratio of strongly lensed z > 1 galaxies decreases quickly with increasing age. This ratio has a moderate sensitivity to metallicity and a comparatively low sensitivity to dust attenuation, with no significant dependency on the stellar initial mass function. Fitting model stellar populations to either the SED or B=R ratio alone of the “Warhol” arc (z = 0:94), we find that neither a simple single starburst nor more complex star formation can simultaneously reproduce both constraints.We then demonstrate that a best-fit model constrained by both the B=R ratio and SED requires a star formation rate that has varied quite dramatically over the past -50 Myr, for which the total stellar mass formed over this time is a factor of 10 (with 2 - 3o significance) different from the best-fit models to the SED alone. Our work shows that the transient B=R ratio can be used as an additional powerful constraint on the recent star formation history of higher-redshift galaxies in future works that are strongly lensed by galaxy clusters.S.K.L., J.L., and J.N. acknowledge support from the Research Grants Council (RGC) of Hong Kong through the General Research Fund (GRF) 17302023. J.M.P. received financial support from the Formación de Personal Investigador (FPI) programme, ref. PRE2020-096261, associated with the Spanish Agencia Estatal de Investigación project MDM-2017-0765-20-2. J.M.D. acknowledges support from project PID2022-138896NB-C51 (MCIU/AEI/MINECO/FEDER, UE) Ministerio de Ciencia, Investigación y Universidades. J.N. also acknowledges the support of the Dissertation Year Fellowship issued by the University of Hong Kong. P.L.K. and L.L.R.W. acknowledge the support by NASA/HST grants GO-15936 and GO-16278 from STScI, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. AZ acknowledges support by 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 Israel Science Foundation Grant No. 864/23. We made use of the following software: Python, NumPy, Matplotlib, SciPy, Astropy, SPISEA, emcee, and corner.Peer reviewedEDP SciencesResearch Grants Council (Hong Kong)Collaborative Research Fund (Hong Kong)Agencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)National Science Foundation (US)NASAThe University of Hong KongUnited States-Israel Binational Science FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/424289reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##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/PRE2020-096261info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/MDM-2017-0765info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-138896NB-C51https://doi.org/10.1051/0004-6361/202556037Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4242892026-05-22T06:33:51Z |
| score |
15,811543 |