Clean up object size usage

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#644 opened on Jul 20, 2023 1 comment 0 reactions 1 assignee View on GitHub

@martinkilbinger is already working on this.

Since Jul 20, 2023.

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clean up

Various estimators of object size are used throughout the code:

fwhm
sigma (e.g. from HSM moment measurement)
T = I_xx + I_yy (sum of second-order moments), also written as R^2, T approx 2 sigma^2

Units can be in pixels or arcsec/arcmin.

These should be unified and made clear.

Two functions to transform between some of those exist in sp_validation/galaxy.py, we should use and extend those.

In the code, replace hard-coded numbers 1.17741, 2.355.

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