Пример #1
0
# %% [markdown]
# # QOF culler

# %%
cull_config = Config()
cull_config.photometry_iterations = 1
cull_config.threshold_factor = -0.1
cull_config.fwhm_guess = 5
cull_config.max_epsf_stars = 150
cull_config.oversampling = 2
cull_config.cutout_size = 13
cull_config.fitshape = 15
cull_config.smoothing = util.make_gauss_kernel(1.2)
cull_session = Session(cull_config, 'gausscluster_N2000_mag22_subpixel')
cull_session.find_stars().select_epsfstars_auto().make_epsf()
detections = cull_session.tables.finder_table

# %%
plt.figure()

plt.imshow(cull_session.image, norm=LogNorm())
input_table = cull_session.tables.input_table
plt.plot(input_table['x'],
         input_table['y'],
         'o',
         fillstyle='none',
         markersize=7,
         markeredgewidth=0.6,
         markeredgecolor='black',
         alpha=0.8,
Пример #2
0

show_image(sg_session.image)
save_plot(outdir, 'photutils_grid')
show_image(gc_session.image)
save_plot(outdir, 'photutils_gausscluster')

# %% [markdown]
# # EPSF derivation

# %%
gauss_config = config.Config()
gauss_config.smoothing = util.make_gauss_kernel(1.5)
sg_gauss_session = Session(gauss_config, sg_session.image_name)

sg_session.find_stars().select_epsfstars_auto().make_epsf()
sg_gauss_session.find_stars().select_epsfstars_auto().make_epsf()

# %%
fig, axs = plt.subplots(1, 2)
im = axs[0].imshow(sg_session.epsf.data)
axs[0].set_title('quartic smoothing kernel')
plt.colorbar(im, ax=axs[0], shrink=0.5)
im = axs[1].imshow(sg_gauss_session.epsf.data)
axs[1].set_title('gaussian $σ=1$ smoothing kernel')
plt.colorbar(im, ax=axs[1], shrink=0.5)

save_plot(outdir, 'epsf_smoothing_comparison')

# %%
from astropy.modeling.functional_models import AiryDisk2D