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Properties of Primitive Galaxies

Published online by Cambridge University Press:  29 August 2024

Sara R. Heap ,
I. Hubeny Open the ORCID record for I. Hubeny [Opens in a new window] ,
J.-C. Bouret ,
T. Lanz  and
J. Brinchmann
Sara R. Heap*
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD,
I. Hubeny
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ,
J.-C. Bouret
Affiliation:
Aix-Marseille Univ. CNRS, CNES, LAM, Marseille, France,
T. Lanz
Affiliation:
Observatoire de Côte d’Azur, Nice, France,
J. Brinchmann
Affiliation:
University of Porto, Porto, Portugal
*
email: sara.heap@Gmail.com
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Abstract

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We report on a study of 9 nearby primitive galaxies observed by Hubble’s COS far-UV spectrograph that can serve as templates of high-z galaxies to be observed by JWST. By “primitive galaxies,” we mean galaxies having a low stellar mass, and low gas metallicity, , whether they are local or at high redshift. We find that far-UV spectra of these galaxies show evidence of hard radiation, including X-rays. Following Thuan et al. (2004), we identify these galaxies as massive X-ray binaries containing a massive accreting stellar black hole. We further find that the lower the metallicity, the higher the probability of extremely strong X-radiation. Following Heger et al. (2003), we suggest that the accreting black hold is produced by direct collapse of stars having initial masses greater than 50 . The X-radiation produced by black hole disk directly affects the surrounding interstellar medium, and many of these effects are observable in far-UV spectra.

Keywords

techniques: spectroscopicultraviolet: galaxiesX-rays: binariesgalaxies: dwarf
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 485 - 489
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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