astrojacobli / kuaizi

Picking low surface brightness galaxies in HSC data with `kuaizi`

Kuaizi 筷子🥢

Picking low surface brightness galaxies in HSC data with kuaizi (筷子, chopsticks in Chinese)

To install, first clone this repository to your local environment, then execute python setup.py install --user. If you want to develop the code, be sure to add the repo directory to your PATH environment (export PYTHONPATH=$PYTHONPATH:"/home/jiaxuanl/Research/Packages/kuaizi").

kuaizi's Issues

Objects are off-centered in the cutout

1. NOTICE: lots of objects are not at the center of cutout... need to deal with this issue.
2. NOTICE: for some galaxies, lsstpipe cannot generate a PSF! Write exception for galaxies lacking PSF.

Tiger and Tigress

Run the code under /tiger/scratch/gpfs, move files to /tigress afterwards

Bright galaxies

My existing pipeline deals with LSBGs very well. However, there are a ton of very bright galaxies in the Candy Sample, ~20 of them has i-mag < 16. My current thoughts are:

• For i-mag < thresh and/or r-mag < thresh: don't limit the box size, just use the box size estimated with starlet_thresh=-0.3.
• For these galaxies, don't add compact sources into modeling. Only model itself (as starlet object) and large objects (as single/multiple-extended sources).

Completeness and measurement error

• Consider incomplete files when calculating any of these numbers