Healpix2.0 map2alm
Posted: November 13 2007
I'm trying to have alms(T,E,B) from map with map2alm,Healpix subroutine.
For simple testing, I put alm=0 except a2,1=1 for temperature and got the proper map but reproduced alms from map2alm,healpix subroutine, haven't got same values like input ones. They have even imaginary part!
Simply speaking,
Input alm =0 or 1
(alm2map) -> Output map ->(map2alm) ->
Output alm = a+bi (nonzero b)
Is there anyone who has a idea?
It seems that imaginary part from ring_analysis for m are nonzero component but still don't know what's wrong with them..
For detail, I used w8ring_TQU=1.d0
zbounds=/-1.d0,1.d0/, Nside=8, nlmax=16
For simple testing, I put alm=0 except a2,1=1 for temperature and got the proper map but reproduced alms from map2alm,healpix subroutine, haven't got same values like input ones. They have even imaginary part!
Simply speaking,
Input alm =0 or 1
(alm2map) -> Output map ->(map2alm) ->
Output alm = a+bi (nonzero b)
Is there anyone who has a idea?
It seems that imaginary part from ring_analysis for m are nonzero component but still don't know what's wrong with them..
For detail, I used w8ring_TQU=1.d0
zbounds=/-1.d0,1.d0/, Nside=8, nlmax=16