2019
DOI: 10.3847/1538-4357/ab3104
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Constraining the Metallicities, Ages, Star Formation Histories, and Ionizing Continua of Extragalactic Massive Star Populations

Abstract: We infer the properties of massive star populations using the far-ultraviolet stellar continua of 61 star-forming galaxies: 42 at low redshift observed with the Hubble Space Telescope and 19 at z∼2 from the MEGaSaURA sample. We fit each stellar continuum with a linear combination of up to 50 single-age and single-metallicity STARBURST99 models. From these fits, we derive light-weighted ages and metallicities, which agree with stellar wind and photospheric spectral features, and infer the spectral shapes and … Show more

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Cited by 140 publications
(202 citation statements)
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References 158 publications
(209 reference statements)
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“…To test how strong the assumptions built in to the stellar models affect the derived escape fractions, we constructed an alternative model based on the BPASS library (44). The best-fit BPASS model (53) has age, metallicity and non-ionizing UV spectral shape consistent with the STARBURST99 model, but predicts a higher intrinsic LyC flux (see figure S6). We infer a lower relative and absolute escape fraction than from STARBURST99, with f BPASS esc,rel = 76 +17 −8 %, and f BPASS esc,abs = 24 +5 −3 %.…”
Section: Stellar Population Modelsmentioning
confidence: 99%
“…To test how strong the assumptions built in to the stellar models affect the derived escape fractions, we constructed an alternative model based on the BPASS library (44). The best-fit BPASS model (53) has age, metallicity and non-ionizing UV spectral shape consistent with the STARBURST99 model, but predicts a higher intrinsic LyC flux (see figure S6). We infer a lower relative and absolute escape fraction than from STARBURST99, with f BPASS esc,rel = 76 +17 −8 %, and f BPASS esc,abs = 24 +5 −3 %.…”
Section: Stellar Population Modelsmentioning
confidence: 99%
“…L 1500 /L 820 is the intrinsic luminosity density ratio between 1500Å and 820Å. Here, we adopt two L 1500 /L 820 values, L 1500 /L 820 = 3 and L 1500 /L 820 = 7, to cover a wide range of possible star formation history (e.g., Siana et al 2007;Chisholm et al 2019). exp(τ IGM,820 ) ≡ 1/T is the mean IGM opacity at 820Å at z = 3.1 (e.g., Madau 1995), and T is the mean IGM transmission.…”
Section: The Lyman Continuum Escape Fraction In Laes At Z=31mentioning
confidence: 99%
“…The integrated spectra of young massive star clusters and star forming galaxies hold the key to revealing the content of massive stars. A comprehensive analysis of the far-UV spectra of 61 star-forming galaxies has been performed by [41]. A major tool for determining the relevant properties is population synthesis, which is the topic of the next section.…”
Section: Massive Stars In Integrated Star Cluster Spectramentioning
confidence: 99%