Project: Aperture Photometry from the Stack

[DouglasLeeTucker]

This is a project to create a notebook to explore how aperture photometry works in the data processing stack. Suggested to me by @bechtol , some questions to be explored are:

• how are the apertures and the aperture corrections defined?
• how are the photometric zeropoints defined/applied?
• how best to extract aperture photometry results from the processing stack?
• how does calibrated aperture photometry from the processing stack compare to external catalogs?
• etc.

The Bosch et al. (2017) HSC paper was suggested as a possible starting point.

At today's (2018-11-02) StackClub session, it was noted that @jeffcarlin might also be working on this, and I should contact him. (@jeffcarlin , let me know if that's the case and what you might want me to focus on! Thanks!)

Data sets to consider include Twinkles and on-sky data (e.g., HSC vs. Gaia), with some preference for on-sky data, at least at first. At today's (2018-11-02) StackClub session, it was suggested that there might already be some notebooks in the Commissioning Team repo that might address this or at least be a good starting point. It was suggested that @jeffcarlin would be a good person to ask (@jeffcarlin : Any suggestions? Thanks!)

[jeffcarlin]

Hi @DouglasLeeTucker - I think that your plan sounds fantastic, and that it has little overlap with my project. It's true that I'm planning to explore the photometric performance, but more from a science perspective of trying to see how well the Stack does at detecting and recovering properties of known dwarf galaxies.

I fleshed out some of the commissioning notebooks to be used as demo notebooks by the LSST SQuaRE team -- they're at https://github.com/lsst-sqre/notebook-demo/tree/u/jcarlin/DM-15123 (note that they're on a ticket branch, not master). In particular, the HSC-COSMOS comparison may be helpful to you. If I think of others, I'll let you know.

[DouglasLeeTucker]

Thanks, @jeffcarlin ! Much appreciated! I am starting to look at your demo notebooks for the LSST SQuaRE team. Thanks!