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This field has been used inHSC Use Case #1 and in Whitmore et al. (2016) to test the HSC photometry. Here we compare with the photometry in HSCv4 and HSCv3. If you would like to make detailed comparisons yourself you will need to download the Brown et al. (2009) catalog via the MAST High Level Science Product (HLSP) webpage http://archive.stsci.edu/prepds/andromeda/. Below we provide a brief summary of the results, including some of the use case discussion; more details are available in Whitmore et al. (2016).
The HSC uses the ABmag system while Brown et al. (2009) use STmag. The conversions, as provided in Brown et al. (2009), are:ABmag_F606W = STmag_F606W - 0.169ABmag_F814W = STmag_F814W - 0.840
The HSC MagAper2 values use an aperture with radius R = 3 pixels while Brown et al. correct to total magnitudes. To compare, we add additional corrections:
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