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Questions - healpy

Converting radial brightness profile to 2D intensity distribution

I have 2-column tables representing the light intensity distribution of a source as a function of its angular radius. These tables were obtained by digitizing the first plot and third plot in this fig...
test-img

Nownuri

astropy

healpy

Votes: 0

Answers: 1

Latest Answer

You should use hp.ang2pix(nside, lon, lat, lonlat=True) to go from longitude and latitude to a pixel index in a HEALPix map. Then you can put the value of the intensity in that location in the array. ...
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Andrea Zonca

Different values of a_lm coefficients for different values of Nside in HealPix

I am using HealPix to calculate the outflow rate of particles through a sphere with some radius and I am trying to determine coefficients of spherical harmonics (basically fit some data with spherical...
test-img

Jack

python

astronomy

healpy

Votes: 0

Answers: 1

Latest Answer

In order to get the same values of a_lm coefficients it is necessary to normalize values of individual pixels with the pixel surface - dividing with 4*pi/npix. Another thing, in case it might be helpf...
test-img

Jack

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