Autogalaxy

PyAutoGalaxy is an open-source Python 3.8+ package for analysing the morphologies and structures of large multi-wavelength galaxy samples.

详见 https://pyautogalaxy.readthedocs.io/

学习笔记

Array2d/Mask2D/Kernel2D

• Array2D:为图像数据定义的一类二维数组类，包含了pixelsize信息，并可以同时包含mask信息

ima_2d = aa.Array2D.no_mask(values=Agemap[0],shape_native=Agemap[0].shape,pixel_scales=0.5)
mask_2d = aa.Mask2D(mask=~mask,shape_native=Agemap[0].shape,pixel_scales=0.5)
noise_2d = aa.Array2D.no_mask(values=vflux**0.5+0.01,shape_native=Agemap[0].shape,pixel_scales=0.5)

• Mask2D中 True值是指被mask掉 （下面例子中mask是一个booltype的ndarray，True是指保留）

ima_2d = ima_2d.apply_mask(mask=mask_2d)
noise_2d =  noise_2d.apply_mask(mask=mask_2d)

• psf是Kernel2D类型

psf_2d = ag.Kernel2D.from_gaussian(shape_native=(10, 10), sigma=1.5, pixel_scales=0.5)

详见 https://pyautogalaxy.readthedocs.io/en/latest/api/_autosummary/autogalaxy.Array2D.html

imaging

• 基于array_2d生成的图像类，必须同时具有原始图像数据，和noisemap，同时psf信息可选

imaging=ag.Imaging(image=ima_2d,noise_map=noise_2d,psf=psf_2d)

• 可以直接对imaging对象做mask

imaging = imaging.apply_mask(mask=mask_2d)

• Imagingplotter

visuals_2d (Visuals2D) – Contains 2D visuals that can be overlaid on 2D plots.

include_2d (Include2D) – Specifies which attributes of the Imaging are extracted and plotted as visuals for 2D plots.

Grid

• 生成grid

grid_2d = ag.Grid2D.uniform(shape_native=Agemap[0].shape, pixel_scales=0.5)

• 从图像获得

grid=imaging.grid