Recovering the star formation histories of recently-quenched galaxies: the impact of model and prior choices

TL;DR

This study evaluates different star formation history models for recently-quenched galaxies, highlighting the importance of model flexibility in accurately recovering key properties like quenching time and post-burst age.

Contribution

Develops and tests a new flexible non-parametric SFH model that improves accuracy in recovering recent star formation history details.

Findings

Flexible non-parametric models accurately recover post-burst ages (~90 Myr scatter).

Standard models underestimate quenching times by up to 200 Myr.

The new SFH model performs well on mock star-forming and quiescent galaxies.

Abstract

Accurate models of the star formation histories (SFHs) of recently-quenched galaxies can provide constraints on when and how galaxies shut down their star formation. The recent development of "non-parametric" SFH models promises the flexibility required to make these measurements. However, model and prior choices significantly affect derived SFHs, particularly for post-starburst galaxies (PSBs) which have sharp changes in their recent SFH. In this paper, we create mock PSBs, then use the Prospector SED fitting software to test how well four different SFH models recover key properties. We find that a two-component parametric model performs well for our simple mock galaxies, but is sensitive to model mismatches. The fixed- and flexible-bin non-parametric models included in Prospector are able to rapidly quench a major burst of star formation, but systematically underestimate the post-burst age by up to 200 Myr. We develop a custom SFH model that allows for additional flexibility in the recent SFH. Our flexible non-parametric model is able to constrain post-burst ages with no significant offset and just ~90 Myr of scatter. Our results suggest that while standard non-parametric models are able to recover first-order quantities of the SFH (mass, SFR, average age), accurately recovering higher-order quantities (burst fraction, quenching time) requires careful consideration of model flexibility. These mock recovery tests are a critical part of future SFH studies. Finally, we show that our new, public SFH model is able to accurately recover the properties of mock star-forming and quiescent galaxies and is suitable for broader use in the SED fitting community.