Merge pull request #10 from e-koch/spectral-fitting

Tutorial for basic fitting with a SpectralCube

make_m33_tutorial_datasets.py

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+# Create the smaller cutouts of the M33 CO and HI cubes to host and
+# be available for download online for the tutorials.
+
+
+import astropy.units as u
+from spectral_cube import SpectralCube
+from pathlib import Path
+
+# When running, change to the location of the data for `workingdir_co` and `workingdir_hi`
+# e.g.,
+# outputdir = Path("/home/ekoch/ownCloud/code_development/radio_astro_tools/")
+# workingdir_co = Path("/home/ekoch/ownCloud/Data/M33/ALMA/")
+# workingdir_hi = Path("/home/ekoch/storage/M33/HI/17B-162/")
+
+# By default, the current directory is used.
+
+outputdir = Path(".")
+
+workingdir_co = Path(".")
+
+workingdir_hi = Path(".")
+
+# Cut region from the CO(2-1) data cube.
+
+cube = SpectralCube.read(workingdir_co / "Brick1Tile1_12CO21_0p7kms.image.pbcor_K.fits")
+
+y, x = 145, 340
+
+size = 32
+
+cube_cutout = cube[:, y-size:y+size, x-size:x+size]
+
+cube_cutout.write(outputdir / "M33_ALMA_ACA_12CO21.cutout.fits", overwrite=True)
+
+# Cutout a similar region from the HI B+C-config cube.
+
+hi_cube = SpectralCube.read(workingdir_hi / "M33_14B_17B_HI_contsub_width_1kms.image.pbcor.GBT_feathered.fits", use_dask=True)
+
+hi_cube_cutout = hi_cube.subcube(xlo=cube_cutout.longitude_extrema[1],
+                                 xhi=cube_cutout.longitude_extrema[0],
+                                 ylo=cube_cutout.latitude_extrema[0],
+                                 yhi=cube_cutout.latitude_extrema[1])
+
+# Convert to K
+hi_cube_cutout = hi_cube_cutout.to(u.K)
+
+hi_cube_cutout.write(outputdir / "M33_VLA_BCconfig_wGBT_HI.cutout.fits", overwrite=True)

requirements.txt

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+numpy
+scipy
+matplotlib
+astropy
+aplpy
+git+https://github.com/radio-astro-tools/spectral-cube/#egg=spectral-cube
+git+https://github.com/radio-astro-tools/radio-beam/#egg=radio-beam
+dask[complete]