PSPHOT Kron Measurements investigation

This page describes some investigations comparing the Kron radius and magnitudes measured by psphot

• Overview of the Issue
• Data Sample
• Recipe Choices
  • Default: Smooth, apply window function, apply weight function
  • No Window
  • No weight
  • No Window no weight, no smooth
  • No Window no weight, no smooth
• Results
  • Summary Statistics
  • Histogram of kron radius
  • Difference in radius
  • difference in magnitude

Kron Radius Histograms

The following images contain histograms of the measured Kron Radius for various recipe combinations.

• Green "Expected" Kron Radius for the simulated galaxy
• Grey Kron Radius measured by SExtractor (provided by Peter Draper)
• Red Kron Radius measured by psphot

Default recipe: Measure on smoothed image, gaussian weighting, window function

Window function no weighting

Weighting no window

No Window No weight

No window no weighting no smoothing

Difference In Kron Radius

Default Recipe

Window Function no weighting

Weighting, no window

No window, no weighting

No window, no weighting, no smoothing

Statistics