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Measuring Galaxy Star Formation Rates From Integrated Photometry: Insights from Color-Magnitude Diagrams of Resolved Stars
Benjamin D. Johnson, Daniel R. Weisz, Julianne J. Dalcanton +8
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 sp…
The Panchromatic Hubble Andromeda Treasury IV. A Probabilistic Approach to Inferring the High Mass Stellar Initial Mass Function and Other Power-law Functions
Daniel R. Weisz, Morgan Fouesneau, David W. Hogg +13
We present a probabilistic approach for inferring the parameters of the present day power-law stellar mass function (MF) of a resolved young star cluster. This technique (a) fully…
The Panchromatic Hubble Andromeda Treasury III. Measuring Ages and Masses of Partially Resolved Stellar Clusters
Lori C. Beerman, L. Clifton Johnson, Morgan Fouesneau +14
The apparent age and mass of a stellar cluster can be strongly affected by stochastic sampling of the stellar initial mass function, when inferred from the integrated color of low…
PHAT Stellar Cluster Survey I. Year 1 Catalog and Integrated Photometry
L. Clifton Johnson, Anil C. Seth, Julianne J. Dalcanton +21
The Panchromatic Hubble Andromeda Treasury (PHAT) survey is an on-going Hubble Space Telescope (HST) multi-cycle program to obtain high spatial resolution imaging of one-third of t…
Modeling the Effects of Star Formation Histories on Halpha and Ultra-Violet Fluxes in Nearby Dwarf Galaxies
Daniel R. Weisz, Benjamin D. Johnson, L. Clifton Johnson +9
We consider the effects of non-constant star formation histories (SFHs) on Halpha and GALEX far ultra-violet (FUV) star formation rate (SFR) indicators. Under the assumption of a f…
Stellar Clusters in M31 from PHAT: Survey Overview and First Results
L. Clifton Johnson, Anil C. Seth, Julianne J. Dalcanton +9
The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going Hubble Space Telescope (HST) multi-cycle program that will image one-third of the M31 disk at high resolution, with…