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Measuring Galaxy Star Formation Rates From Integrated Photometry: Insights from Color-Magnitude Diagrams of Resolved Stars by Johnson, Benjamin D.; Weisz, Daniel R.; Dalcanton, Julianne J.; Johnson, L. Clifton; Dale, Daniel A.; Dolphin, Andrew E.; de Paz, Armando Gil; Kennicutt, Robert C.; Lee, Janice C.; Skillman, Evan D.; Williams, Benjamin F. is a scholarly article available to read on EtoBox.

What is Measuring Galaxy Star Formation Rates From Integrated Photometry: Insights from Color-Magnitude Diagrams of Resolved Stars about?

We use empirical star formation histories (SFHs), measured from HST-based resolved star color-magnitude diagrams, as input into population synthesis codes to model the broadband spectral energy distributions (SEDs) of ~50 nearby dwarf galaxies (6.5 < log M/M_* < 8.5, with metallicities ~10% solar). In the presence of realistic SFHs, we compare the modeled and observed SEDs from the ultraviolet (UV) through near-infrared (NIR) and assess the reliability of widely used UV-based star formation rate (SFR) indicators. In the FUV through i bands, we find that the observed and modeled SEDs are in excellent agreement. In the Spitzer 3.6micron and 4.5micron bands, we find that modeled SEDs systematically over-predict observed luminosities by up to ~0.2 dex, depending on treatment of the TP-AGB stars in the synthesis models. We assess the reliability of UV luminosity as a SFR indicator, in light of independently constrained SFHs. We find that fluctuations in the SFHs alone can cause factor of ~2 variations in the UV luminosities relative to the assumption of a constant SFH over the past 100 Myr. These variations are not strongly correlated with UV-optical colors, implying that correcting UV-

Author

Johnson, Benjamin D.; Weisz, Daniel R.; Dalcanton, Julianne J.; Johnson, L. Clifton; Dale, Daniel A.; Dolphin, Andrew E.; de Paz, Armando Gil; Kennicutt, Robert C.; Lee, Janice C.; Skillman, Evan D.; Williams, Benjamin F.

Published

2013

Language

EN