The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission

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dc.contributor.authorMelinder, Jens
dc.contributor.authorÖstlin, Göran
dc.contributor.authorHayes, Matthew
dc.contributor.authorRasekh, Armin
dc.contributor.authorMas-Hesse, J. Miguel
dc.contributor.authorCannon, John M.
dc.contributor.authorKunth, Daniel
dc.contributor.authorLaursen, Peter
dc.contributor.authorRunnholm, Axel
dc.contributor.authorHerenz, E. Christian
dc.contributor.authorMessa, Matteo
dc.contributor.authorSchaerer, Daniel
dc.contributor.authorVerhamme, Anne
dc.contributor.authorRivera-Thorsen, T. Emil
dc.contributor.authorGuaita, Lucia
dc.contributor.authorMarquart, Thomas
dc.contributor.authorPuschnig, Johannes
dc.contributor.authorLe Reste, Alexandra
dc.contributor.authorSandberg, Andreas
dc.contributor.authorFreeland, Emily
dc.contributor.authorBridge, Joanna
dc.date.accessioned2024-10-16T20:47:45Z
dc.date.available2024-10-16T20:47:45Z
dc.date.issued2023-05
dc.descriptionIndexación: Scopus
dc.description.abstractWe present Lyα imaging of 45 low-redshift star-forming galaxies observed with the Hubble Space Telescope. The galaxies have been selected to have moderate to high star formation rates (SFRs) using far-ultraviolet (FUV) luminosity and Hα equivalent width criteria, but no constraints on Lyα luminosity. We employ a pixel stellar continuum fitting code to obtain accurate continuum-subtracted Lyα, Hα, and Hβ maps. We find that Lyα is less concentrated than FUV and optical line emission in almost all galaxies with significant Lyα emission. We present global measurements of Lyα and other quantities measured in apertures designed to capture all of the Lyα emission. We then show how the escape fraction of Lyα relates to a number of other measured quantities (mass, metallicity, star formation, ionization parameter, and extinction). We find that the escape fraction is strongly anticorrelated with nebular and stellar extinction, weakly anticorrelated with stellar mass, but no conclusive evidence for correlations with other quantities. We show that Lyα escape fractions are inconsistent with common dust extinction laws, and discuss how a combination of radiative transfer effects and clumpy dust models can help resolve the discrepancies. We present an SFR calibration based on Lyα luminosity, where the equivalent width of Lyα is used to correct for nonunity escape fraction, and show that this relation provides a reasonably accurate SFR estimate. We also show stacked growth curves of Lyα for the galaxies that can be used to find aperture loss fractions at a given physical radius. © 2023. The Author(s). Published by the American Astronomical Society.
dc.description.urihttps://iopscience-iop-org.recursosbiblioteca.unab.cl/article/10.3847/1538-4365/acc2b8
dc.identifier.citationAstrophysical Journal, Supplement Series. Volume 266, Issue 1. 1 May 2023. Article number 15
dc.identifier.doi10.3847/1538-4365/acc2b8
dc.identifier.issn0067-0049
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/61333
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.rights.licenseCC BY 4.0 Attribution 4.0 International Deed
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectEmission Line Galaxies (459)
dc.subjectGalaxies (573)
dc.subjectLyman-alpha Galaxies (978)
dc.subjectStarburst Galaxies (1570)
dc.subjectAstronomical Methods (1043)
dc.subjectObservational Astronomy (1145)
dc.subject
dc.titleThe Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission
dc.typeArtículo
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