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- W4387389660 abstract "We use CANUCS JWST/NIRCam imaging of galaxies behind the gravitationally-lensing cluster MACS J0417.5-1154 to investigate star formation burstiness in low-mass ($M_starsim10^8 M_odot$) galaxies at $zsim4.7-6.5$. Our sample of 123 galaxies is selected using the Lyman break selection and photometric emission-line excess methods. Sixty percent of the 123 galaxies in this sample have H$alpha$-to-UV flux ratios that deviate significantly from the range of $eta_{1500}$ values consistent with smooth and steady star formation histories. This large fraction indicates that the majority of low-mass galaxies is experiencing bursty star formation histories at high redshift. We also searched for interacting galaxies in our sample and found that they are remarkably common ($sim40 %$ of the sample). Compared to non-interacting galaxies, interacting galaxies are more likely to have very low H$alpha$-to-UV ratios, suggesting that galaxy-galaxy interactions enhance star formation burstiness and enable faster quenching (with timescales of $lesssim100$ Myr) that follows the rapid rise of star formation activity. Given the high frequency of galaxy-galaxy interactions and the rapid SFR fluctuations they appear to cause, we conclude that galaxy-galaxy interactions could be a leading cause of bursty star formation in low-mass, high-$z$ galaxies. They could thus play a significant role in the evolution of the galaxy population at early cosmological times." @default.
- W4387389660 created "2023-10-06" @default.
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- W4387389660 date "2023-10-03" @default.
- W4387389660 modified "2023-10-07" @default.
- W4387389660 title "Bursty star formation and galaxy-galaxy interactions in low-mass galaxies 1 Gyr after the Big Bang" @default.
- W4387389660 doi "https://doi.org/10.48550/arxiv.2310.02314" @default.
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