1. The far-ultraviolet continuum slope as a Lyman Continuum escape estimator at high redshift
- Author
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J Chisholm, A Saldana-Lopez, S Flury, D Schaerer, A Jaskot, R Amorín, H Atek, S L Finkelstein, B Fleming, H Ferguson, V Fernández, M Giavalisco, M Hayes, T Heckman, A Henry, Z Ji, R Marques-Chaves, V Mauerhofer, S McCandliss, M S Oey, G Östlin, M Rutkowski, C Scarlata, T Thuan, M Trebitsch, B Wang, G Worseck, X Xu, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Astronomy
- Subjects
first stars ,FOS: Physical sciences ,galaxies: starburst ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies ,[SDU]Sciences of the Universe [physics] ,galaxies: high-redshift ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,ultraviolet: galaxies ,reionization ,dark ages ,Astrophysics::Galaxy Astrophysics - Abstract
Most of the hydrogen in the intergalactic medium (IGM) was rapidly ionized at high-redshifts. While observations have established that reionization occurred, observational constraints on the emissivity of ionizing photons at high-redshift remains elusive. Here, we present a new analysis of the Low-redshift Lyman Continuum Survey (LzLCS) and archival observations, a combined sample of 89 star-forming galaxies at z~0.3 with Hubble Space Telescope observations of their ionizing continua (or Lyman Continuum, LyC). We find a strong (6$\sigma$ significant) inverse correlation between the continuum slope at 1550\r{A} (defined as F$_\lambda\propto\lambda^{\beta}$) and both the LyC escape fraction (f$_{esc}$) and f$_{esc}$ times the ionizing photon production efficiency ($\xi_{ ion}$). On average, galaxies with redder continuum slopes have smaller f$_{esc}$ than galaxies with bluer slopes due to higher dust attenuation. More than 5% (20%) of the LyC emission escapes galaxies with $\beta$, Comment: 14 pages plus appendix. Submitted to MNRAS. Comments encouraged
- Published
- 2022
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