FRESCO: The Paschen-$\alpha$ Star Forming Sequence at Cosmic Noon
We present results from the JWST First Reionization Epoch Spectroscopically Complete Observations survey (FRESCO) on the star forming sequence of galaxies at $1.0<z<1.7$, around the peak of the cosmic star formation history. Star formation rates (SFRs) are measured from the redshifted, nearly...
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Main Authors | , , , , , , , , , , , , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
16.04.2024
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Subjects | |
Online Access | Get full text |
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Summary: | We present results from the JWST First Reionization Epoch Spectroscopically
Complete Observations survey (FRESCO) on the star forming sequence of galaxies
at $1.0<z<1.7$, around the peak of the cosmic star formation history. Star
formation rates (SFRs) are measured from the redshifted, nearly
dust-insensitive Paschen-$\alpha$ emission line, and stellar mass measurements
include the F444W (4.4 $\mu$m; rest-frame H) band. We find SFRs of galaxies
with $M*>9.5 M_\odot$ that are lower than found in many earlier studies by up
to 0.6 dex, but in good agreement with recent results obtained with the
Prospector fitting framework. The difference
log(SFR(Pa$\alpha$)-SFR(Prospector)) is -0.09 $\pm$ 0.04 dex at $10^{10-11}
M_\odot$. We also measure the empirical relation between Paschen-$\alpha$
luminosity and rest-frame H band magnitude and find that the scatter is only
0.04 dex lower than that of the SFR-M* relation and is much lower than the
systematic differences among relations in the literature due to various methods
of converting observed measurements to physical properties. We additionally
identify examples of sources -- that, with standard cutoffs via the UVJ
diagram, would be deemed quiescent -- with significant, typically extended,
Paschen-$\alpha$ emission. Our results may be indicative of the potential
unification of methods used to derive the star forming sequence with careful
selection of star forming galaxies and independent star formation rate and
stellar mass indicators. |
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DOI: | 10.48550/arxiv.2404.10816 |