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CEERS: Increasing Scatter along the Star-Forming Main Sequence Indicates Early Galaxies Form in Bursts by Cole, Justin W.; Papovich, Casey; Finkelstein, Steven L.; Bagley, Micaela B.; Dickinson, Mark; Iyer, Kartheik G.; Yung, L. Y. Aaron; Ciesla, Laure; Amorin, Ricardo O.; Haro, Pablo Arrabal; Bhatawdekar, Rachana; Calabro, Antonello; Cleri, Nikko J.; de la Vega, Alexander; Dekel, Avishai; Endsley, Ryan; Gawiser, Eric; Giavalisco, Mauro; Hathi, Nimish P.; Hirschmann, Michaela; Holwerda, Benne W.; Kartaltepe, Jeyhan S.; Koekemoer, Anton M.; Lucas, Ray A.; Mascia, Sara; Mobasher, Bahram; Perez-Gonzalez, Pablo G.; Rodighiero, Giulia; Ronayne, Kaila; Tachhella, Sandro; Weiner, Benjamin J.; Wilkins, Stephen M. is a scholarly article available to read on EtoBox.

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We present the star-formation-rate -- stellar-mass (SFR-M$_\ast$) relation for galaxies in the CEERS survey at $4.5\leq z\leq 12$. We model the \jwst\ and \hst\ rest-UV and rest-optical photometry of galaxies with flexible star-formation histories (SFHs) using \bagpipes. We consider SFRs averaged from the SFHs over 10~Myr (\sfrten) and 100~Myr (\sfrcen), where the photometry probes SFRs on these timescales, effectively tracing nebular emission lines in the rest-optical (on $\sim10$~Myr timescales) and the UV/optical continuum (on $\sim100$ Myr timescales). We measure the slope, normalization and intrinsic scatter of the SFR-M$_\ast$ relation, taking into account the uncertainty and the covariance of galaxy SFRs and $M_\ast$. From $z\sim 5-9$ there is larger scatter in the $\sfrten-M_\ast$ relation, with $\sigma(\log \sfrcen)=0.4$~dex, compared to the $\sfrcen-M_\ast$ relation, with $\sigma(\log \sfrten)=0.1$~dex. This scatter increases with redshift and increasing stellar mass, at least out to $z\sim 7$. These results can be explained if galaxies at higher redshift experience an increase in star-formation variability and form primarily in short, active periods, followed by a lull i

Author

Cole, Justin W.; Papovich, Casey; Finkelstein, Steven L.; Bagley, Micaela B.; Dickinson, Mark; Iyer, Kartheik G.; Yung, L. Y. Aaron; Ciesla, Laure; Amorin, Ricardo O.; Haro, Pablo Arrabal; Bhatawdekar, Rachana; Calabro, Antonello; Cleri, Nikko J.; de la Vega, Alexander; Dekel, Avishai; Endsley, Ryan; Gawiser, Eric; Giavalisco, Mauro; Hathi, Nimish P.; Hirschmann, Michaela; Holwerda, Benne W.; Kartaltepe, Jeyhan S.; Koekemoer, Anton M.; Lucas, Ray A.; Mascia, Sara; Mobasher, Bahram; Perez-Gonzalez, Pablo G.; Rodighiero, Giulia; Ronayne, Kaila; Tachhella, Sandro; Weiner, Benjamin J.; Wilkins, Stephen M.

Published

2023

Language

EN