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FG
Module FAKGAL allows on to create artificial iamges of galaxies
described by a number of different surface brightness laws, or by data in
a file of type 1. The information can be written to a character file (of
type 1) or a SAD file.
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Enter an option: 29-JUL-1985 15:56:01.43
OPTION=FG
FAKGAL, Version 1
Enter a command:
Enter a command:
B = Parameters contained in file prepared by option BB
P = Parameters contained in a file prepared by options EA or PR (default)
PA = Like P, but with additional absorbing galaxy
PB = Like PA, but only the absorption is written
M = Parameters input manually
MA = Like M, but with additional absorbing galaxy
MB = Like MB, but only the absorption is written
COMMAND=M
Do you want a data file (enter D) or a SAD file (enter S, default)?
FILE=
S ....A default was taken
Enter the name of the file to be written to:
FILE=TEST
Creating new file
Enter the number of columns and the number of rows:
MAP_SIZE=100 100
Enter the surface brightness law:
H = Hubble (default)
M = Modified Hubble
P = Hubble with power series for "1/a"
T = Tapered Hubble
V = de Vaucouleurs
CHOICE=M
Enter the central surface brightness (ADU) and the Hubble "a" (pixels):
PARAMETERS=1000 10
Enter a choice:
N = No gradient applied (default)
L = Multiplies by a gradient linear in magnitude and log(radius)
R = Multiplies by a gradient linear in magnitude and radius
GRADIENT=
N ....We could apply an intensity gradient
Enter column and row: (default = last position, fractional values allowed)
POSITION=50 50
Enter the ellipse inclination angle: (default = 0.0 degrees)
INCLINATION=
0.000000E+00
Enter the eccentricity of the ellipse: (default = 0.0)
ECCENTRICITY=
0.000000E+00
Do you wish to convolve the distribution? (default = N)
CONVOLVE=
F ....We could, if we wished, convolve by the seeing disk.
Enter the scale factor: (default = 1.0)
SCALE=
1.00000
More galaxies to model? (default = Y)
MORE=
T
Enter the surface brightness law:
H = Hubble (default)
M = Modified Hubble
P = Hubble with power series for "1/a"
T = Tapered Hubble
V = de Vaucouleurs
CHOICE=
H ....Here we choose the Reynold-Hubble formula
Enter the central surface brightness (ADU) and the Hubble "a" (pixels):
PARAMETERS=500 5
Enter a choice:
N = No gradient applied (default)
L = Multiplies by a gradient linear in magnitude and log(radius)
R = Multiplies by a gradient linear in magnitude and radius
GRADIENT=
N
Enter column and row: (default = last position, fractional values allowed)
POSITION=40 50
Enter the ellipse inclination angle: (default = 0.0 degrees)
INCLINATION=45
Enter the eccentricity of the ellipse: (default = 0.0)
ECCENTRICITY=.5
Do you wish to convolve the distribution? (default = N)
CONVOLVE=
F
More galaxies to model? (default = Y)
MORE=N
....Here is another example of the usage of option
FG. Here, we use a data file of type 1 to supply
the intensity values. This particular operation
is necessary when modeling overlapping galaxy images.
After an interfering galaxy is modeled, it is subtracted
from the frame so as to better model the remaining
images.
Enter an option: 22-OCT-1991 13:28:45.70
OPTION=FG
FAKGAL, Version 1
Enter a command:
B = Parameters contained in file prepared by option BB
P = Parameters contained in a file prepared by options EA or PR (default)
PA = Like P, but with additional absorbing galaxy
PB = Like PA, but only the absorption is written
M = Parameters input manually
MA = Like M, but with additional absorbing galaxy
MB = Like MB, but only the absorption is written
COMMAND=
P
Enter the name of the file to be written to:
FILE=GAL1
Writing to an existing file
There is one map in the file
Enter the map number: (default = one after the last map)
MAP=1
512 rows of 320 pixels in R4 format
Open the input data file
Enter the file name: (default = last entry)
FILE_21=R022152
Enter the ID of the object: (default = last entry)
ID=129
Enter the sky to be subtracted from the data in the file: (default = minimum)
SKY=491.052 ....The model in the data file included the sky
Enter the scale factor: (default = 1.0)
SCALE=-1 ....We are subtracting from the frame here.
At the stage where all interfering galaxies
have been modeled and subtracted, one would
add the data file to the frame in order to
perform the final modeling with option PR.
More galaxies to model? (default = Y)
MORE=N
Enter an option: 22-OCT-1991 13:30:03.45
OPTION=EX
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