At z=3, field-level EFT fits give linear biases around 4 for LBGs and 2 for LAEs in MTNG and Astrid, with an estimated EFT momentum reach of 0.2-0.8 inverse megaparsecs, suggesting EFT will work for future high-redshift surveys.
Star Formation Indicators and Line Equivalent Width in Lyman Alpha Galaxies
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abstract
The equivalent width (EW) of the Lyman Alpha (Lya) line is directly related to the ratio of star formation rates determined from Lya flux and UV flux density [SFR(Lya)/SFR(UV)]. We use published data --in the literature EW and SFR(Lya)/SFR(UV) are treated as independent quantities-- to show that the predicted relation holds for the vast majority of observed Lya emitting galaxies (LAEs). We show that the relation between EW and SFR(Lya)/SFR(UV) applies irrespective of a galaxy's `true' underlying star formation rate, and that its only source of scatter is the variation in the spectral slope of the UV continuum between individual galaxies. The derived relation, when combined with the observed EW distribution, implies that the ratio SFR(UV)/SFR(Lya) is described well by a log-normal distribution with a standard deviation of ~0.3-0.35. This result is useful when modelling the statistical properties of LAEs. We further discuss why the relation between EW and SFR(Lya)/SFR(UV) may help identifying galaxies with unusual stellar populations.
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High-redshift Millennium and Astrid galaxies in effective field theory at the field level
At z=3, field-level EFT fits give linear biases around 4 for LBGs and 2 for LAEs in MTNG and Astrid, with an estimated EFT momentum reach of 0.2-0.8 inverse megaparsecs, suggesting EFT will work for future high-redshift surveys.