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Dissecting the very metal-poor galaxy SBS0335-052E with MUSE: massive stars vs. nebular HeII emission

Published online by Cambridge University Press:  29 August 2024

C. Kehrig Open the ORCID record for C. Kehrig [Opens in a new window] ,
J. M. Vílchez ,
M. A. Guerrero ,
J. Iglesias-Páramo ,
L. K. Hunt ,
S. Duarte Puertas  and
G. Ramos-Larios Open the ORCID record for G. Ramos-Larios [Opens in a new window]
C. Kehrig*
Affiliation:
Instituto de Astrofsica de Andaluca, CSIC, Glorieta de la Astronomia s/n, 18008, Granada, Spain
J. M. Vílchez
Affiliation:
Instituto de Astrofsica de Andaluca, CSIC, Glorieta de la Astronomia s/n, 18008, Granada, Spain
M. A. Guerrero
Affiliation:
Instituto de Astrofsica de Andaluca, CSIC, Glorieta de la Astronomia s/n, 18008, Granada, Spain
J. Iglesias-Páramo
Affiliation:
Instituto de Astrofsica de Andaluca, CSIC, Glorieta de la Astronomia s/n, 18008, Granada, Spain
L. K. Hunt
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, 50125 Firenze, Italy
S. Duarte Puertas
Affiliation:
Instituto de Astrofsica de Andaluca, CSIC, Glorieta de la Astronomia s/n, 18008, Granada, Spain
G. Ramos-Larios
Affiliation:
Instituto de Astronoma y Meteorologa, Dpto. de Fsica, Universidad de Guadalajara 44130 Guadalajara, Jalisco, Mexico
*
email: kehrig@iaa.es
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Abstract

Nebular Heii emission implies the presence of energetic photons (E≽54 eV). Despite the great deal of effort dedicated to understanding Heii ionization, its origin has remained mysterious, particularly in metal-deficient star-forming galaxies. Unfolding Heii-emitting, metal-poor starbursts at z∼0 can yield insight into the powerful ionization processes occurring in the primordial universe. Here we present a study on the origin of the extended nebular Heii emission in SBS 0335-052E, one of the most metal-poor (Z ∼ 3% Z⊙ Heii-emitter starbursts known locally. Based on optical VLT/MUSE spectroscopic and Chandra X-ray observations, and current stellar models we found that the Heii-ionization budget of SBS 0335-052E can only be produced by peculiar, nearly metal-free ionizing stars (called here “PopIII-like” stars) with a top-heavy initial mass function. This result is in line with recent simulations for PopIII star formation down to z=0.

Keywords

galaxies: individual: SBS 0335-052Egalaxies: starburstgalaxies: dwarfgalaxies: ISMgalaxies: stellar content
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 88 - 94
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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