Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy

Aims. We report the discovery and characterisation of a Lyman α (Lyα) blob close to a galaxy at redshift z = 3.49. We present the analysis we performed to check whether the companion galaxy could be the source of the ionised photons responsible for the Lyα emission from the blob.

Detalles Bibliográficos
Autores: Zarattini, S., Rodríguez-Espinosa, J. M., Muñoz-Tuñón, C., Mas-Hesse, J. M., Arrabal Haro, P.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/411267
Acceso en línea:http://hdl.handle.net/10261/411267
Access Level:acceso abierto
Palabra clave:Galaxies: high-redshift
Galaxies: photometry
Galaxies: starburst
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dc.title.none.fl_str_mv Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
title Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
spellingShingle Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
Zarattini, S.
Galaxies: high-redshift
Galaxies: photometry
Galaxies: starburst
title_short Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
title_full Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
title_fullStr Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
title_full_unstemmed Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
title_sort Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxy
dc.creator.none.fl_str_mv Zarattini, S.
Rodríguez-Espinosa, J. M.
Muñoz-Tuñón, C.
Mas-Hesse, J. M.
Arrabal Haro, P.
author Zarattini, S.
author_facet Zarattini, S.
Rodríguez-Espinosa, J. M.
Muñoz-Tuñón, C.
Mas-Hesse, J. M.
Arrabal Haro, P.
author_role author
author2 Rodríguez-Espinosa, J. M.
Muñoz-Tuñón, C.
Mas-Hesse, J. M.
Arrabal Haro, P.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
European Commission
Gobierno de Canarias
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: high-redshift
Galaxies: photometry
Galaxies: starburst
topic Galaxies: high-redshift
Galaxies: photometry
Galaxies: starburst
description Aims. We report the discovery and characterisation of a Lyman α (Lyα) blob close to a galaxy at redshift z = 3.49. We present the analysis we performed to check whether the companion galaxy could be the source of the ionised photons responsible for the Lyα emission from the blob.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
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/10261/411267
url http://hdl.handle.net/10261/411267
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/PID2019-107408GB-C43
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-136598NB-C31
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-119342GB-I00
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http://dx.doi.org/10.1051/0004-6361/202451040
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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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
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spelling Discovery of a Lyα blob photo-ionised by a super-cluster of massive stars associated with a z = 3.49 galaxyZarattini, S.Rodríguez-Espinosa, J. M.Muñoz-Tuñón, C.Mas-Hesse, J. M.Arrabal Haro, P.Galaxies: high-redshiftGalaxies: photometryGalaxies: starburstAims. We report the discovery and characterisation of a Lyman α (Lyα) blob close to a galaxy at redshift z = 3.49. We present the analysis we performed to check whether the companion galaxy could be the source of the ionised photons responsible for the Lyα emission from the blob.Methods. We used images obtained from the 10.4 m Gran Telescopio Canarias (GTC) telescope that are part of the Survey of High-z Absorption Red and Dead Sources (SHARDS) project. The blob is only visible in the F551W17 filter, centred around the Lyα line at the redshift of the galaxy. We measured the luminosity of the blob with a two-step procedure. Here, we start with a description of the radial surface-brightness (SB) profile of the galaxy, using a Sérsic function. We then removed this model from the SB profile of the blob and measured the luminosity of the blob alone. We also estimated the Lyα continuum of the galaxy using an Advanced Camera for Surveys (ACS) image from the Hubble Space Telescope (HST) in the F606W filter, which is wider than the SHARDS one and centred at about the same wavelength. In this image, the galaxy is visible, but the blob is not detected, since its Lyα emission is diluted in the larger wavelength range of the F606W filter.Results. We find that the Lyα luminosity of the blob is 1.0 × 1043 erg s−1, in agreement with other Lyα blobs reported in the literature. The luminosity of the galaxy in the same filter is 2.9 × 1042 erg s−1. The luminosity within the HST/ACS image that we used to estimate the Lyα continuum emission is Lcont = 1.1 × 1043 erg s−1. With these values, we have been able to estimate the Lyα equivalent width (EW), found to be 111 Å (rest-frame). This value is in good agreement with the literature and suggests that a super-cluster of massive (1 − 2 × 107 M⊙) and young (2 − 4 Myr) stars could be responsible for the ionisation of the blob. We also used two other methods to estimate the luminosity of the galaxy and the blob to assess the robustness of our results. We find a reasonable agreement that supports our conclusions. It is worth noting that the Lyα blob is spatially decoupled from the galaxy by 3 GTC/SHARDS pixels, corresponding to 5.7 kpc at the redshift of the objects. This misalignment could suggest the presence of an ionised cone of material escaping from the galaxy, as found in nearby galaxies such as M 82. © The Authors 2025.The authors thanks the anonymous referee for its useful comments that help clarifying the results of this paper. The authors also thanks Dr. Rosa Calvi for useful comments and discussion. This work is part of the collaboration ESTALLIDOS, supported by Spanish MICIU/AEI/10.13039/501100011033 grants PID2019-107408GB-C43 and PID2022-136598NB-C31, and by the Government of the Canary Islands through EU FEDER funding project PID2021010077. SZ and JMMH are also supported by the Spanish MICIU/AEI/10.13039/501100011033 grants PID2020119342GB-I00 and PID2023-147338NB-C21, respectively. Based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, on the island of La Palma. This work is based on data obtained with the SHARDS filter set, procured by Universidad Complutense de Madrid (UCM) through grant AYA2012-31277, and on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–26555.Peer reviewedEDP SciencesMinisterio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)European CommissionGobierno de CanariasConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/411267reponame: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##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107408GB-C43info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-136598NB-C31info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-119342GB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-147338NB-C21http://dx.doi.org/10.1051/0004-6361/202451040Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4112672026-05-22T06:33:51Z
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