Instructions for ~rmaddale/bin/tsky
Ronald J Maddalena
September 9, 2014
tsky -- Returns the galactic background toward a given position at a
given frequency using either the Fortran Tsky.f program that
assumes a spectral index of -2.6 or an IdlUtils model which
allows the S.I. to vary across the sky
tsky [ -h | -help ] [ -model ( Fortran | IdlUtils | Both ) ]
[ -coordType J2000 | B1950 | Galactic ] [ -freq frequency ]
[ -x xcoord ] [ -y ycoord ]
If any model other than Both is specified, eturns a single value in K.
Otherwise returns a value for both models (IdlUtils first, then
The user can use default options by not specifying any command-line
arguments or supply values to the following arguments:
-h or -help
Brings up this help page and all other options are ignored
The desired model. Choices are Fortran, IdlUtils, or Both.
Default is Fortran. IdlUtils takes about 1 sec to run while
Fortran is much, much faster.
Desired frequency in MHz. Default is 1420 MHz.
The coordinate system of the input coordinates. Choices are J2000,
B1950, Galactic. Default is J2000. Note that tyhe conversion
is rough but good enough due to the approximations of the temperature
The x and y position in the desired coordinate system. If J2000
or B1950, x is in HH.hhhhhh or HH:MM:SS formats and Y is in either
sDD.dddddd or sDD:MM:SS format. For Galatic coordinates, x is in
DDD.dddddd format and Y is in sDD.dddddd format. Default is 0, 0.