xlens.simulator.bat

Utilities for applying BATSim transforms.

Functions

draw_ia(→ galsim.Image)

Draw a postage stamp using the BATSim intrinsic alignment transform.

Module Contents

draw_ia(amplitude, beta, phi, clip_radius, stamp_size, gal_obj: galsim.GSObject, psf_obj: galsim.GSObject, image_pos: galsim.PositionD, draw_method: str, pixel_scale: float, entry) → galsim.Image[source]

Draw a postage stamp using the BATSim intrinsic alignment transform.

Parameters:

  • amplitude (float) – IA amplitude parameter A passed to batsim.IaTransform.

  • beta (float) – IA beta parameter.

  • phi (float) – IA orientation angle (radians).

  • clip_radius (float) – Clip radius in units of half-light radii.

  • stamp_size (int) – Side length (pixels) of the output stamp.

  • gal_obj (galsim.GSObject) – Galaxy profile before PSF convolution.

  • psf_obj (galsim.GSObject) – PSF profile.

  • image_pos (galsim.PositionD) – Absolute pixel position of the galaxy on the coadd.

  • draw_method (str) – GalSim draw method (e.g. "auto", "no_pixel").

  • pixel_scale (float) – Pixel scale in arcseconds.

  • entry (numpy structured scalar) – Galaxy catalog row; must contain "hlr" field.

Returns:

Rendered postage stamp with bounds set on the coadd grid.

Return type:

galsim.Image