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- W3100584556 abstract "We investigate the burstiness of star formation histories (SFHs) of galaxies at 0.4 < z < 1 by using the ratio of star formation rates (SFRs) measured from Hβ and FUV (1500 Å) (Hβ-to-FUV ratio). Our sample contains 164 galaxies down to stellar mass (M*) of 108.5 M⊙ in the CANDELS GOODS-N region, where Team Keck Redshift Survey Keck/DEIMOS spectroscopy and Hubble Space Telescope/WFC3 F275W images from CANDELS and Hubble Deep UV Legacy Survey are available. When the ratio of Hβ- and FUV-derived SFRs is measured, dust extinction correction is negligible (except for very dusty galaxies) with the Calzetti attenuation curve. The Hβ-to-FUV ratio of our sample increases with M* and SFR. The median ratio is ∼0.7 at M* ∼ 108.5 M⊙ (or SFR ∼ 0.5 M⊙ yr−1) and increases to ∼1 at M* ∼ 1010 M⊙ (or SFR ∼ 10 M⊙ yr−1). At M* < 109.5 M⊙, our median Hβ-to-FUV ratio is lower than that of local galaxies at the same M*, implying a redshift evolution. Bursty SFH on a timescale of a few tens of megayears on galactic scales provides a plausible explanation for our results, and the importance of the burstiness increases as M* decreases. Due to sample selection effects, our Hβ-to-FUV ratio may be an upper limit of the true value of a complete sample, which strengthens our conclusions. Other models, e.g., non-universal initial mass function or stochastic star formation on star cluster scales, are unable to plausibly explain our results." @default.
- W3100584556 created "2020-11-23" @default.
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- W3100584556 date "2016-12-07" @default.
- W3100584556 modified "2023-10-14" @default.
- W3100584556 title "THE BURSTY STAR FORMATION HISTORIES OF LOW-MASS GALAXIES AT 0.4 < <i>z</i> < 1 REVEALED BY STAR FORMATION RATES MEASURED FROM H<i>β</i> AND FUV" @default.
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