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Global Properties of Star-Forming Galaxies from Ultraviolet Spectroscopy

Published online by Cambridge University Press:  29 August 2024

Claus Leitherer Open the ORCID record for Claus Leitherer [Opens in a new window] ,
Ilyse Clark ,
Karla Arellano-Córdova  and
Danielle A. Berg Open the ORCID record for Danielle A. Berg [Opens in a new window]
Claus Leitherer*
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr, Baltimore, MD 21218, USA
Ilyse Clark*
Affiliation:
Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
Karla Arellano-Córdova*
Affiliation:
Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
Danielle A. Berg*
Affiliation:
Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
*
email: leitherer@stsci.edu
email: ilyseclark@austin.utexas.edu, kzarellano@austin.utexas.edu, daberg@austin.utexas.edu
email: ilyseclark@austin.utexas.edu, kzarellano@austin.utexas.edu, daberg@austin.utexas.edu
email: ilyseclark@austin.utexas.edu, kzarellano@austin.utexas.edu, daberg@austin.utexas.edu
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Abstract

We analyzed archival HST and IUE ultraviolet spectra of 29 nearby star-forming galaxies. The range of aperture sizes permits studies of the galaxy properties over pc to kpc scales. We measured line strengths and spectral energy distributions over the 1200 – 1300 Åwavelength range and established trends with galaxy properties. Updated oxygen abundances were measured from ancillary optical data. Star-formation rates and internal dust attenuations were derived from comparison with synthesis models. The interstellar absorption lines are heavily saturated, yet scale with oxygen abundance. We interpret this as due to macroscopic velocities arising in a turbulent ISM and large-scale outflows. The stellar-wind lines also scale with oxygen abundance. As these lines are shaped by mass loss, which is driven by the Fe abundance, we can study the α-element/Fe ratio in these galaxies.

Keywords

stars: early-typegalaxies: abundancesgalaxies: star clustersgalaxies: starburstgalaxies: stellar content
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 46 - 51
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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