function photometry
Perform aperture photometry on X. This function returns a 3xn matrix with the following information: measured counts, normalized counts (Jansky), magnitude.
Syntax
result = photometry(X, POSLIST, REFLIST, SEARCHBOX, RADIUS, [,/u | /b | /v | /r | /i | /j | /h | /k | /l | /m | /n])
Arguments
| X: | The image on which to do aperture photometry |
| POSLIST: | A 2xn matrix containing the positions of the stars |
| REFLIST: | A 1xm matrix containing magnitudes of reference stars (in the same order as in poslist), with a value > 20.0 if not to be used |
| SEARCHBOX: | Within a box with this radius the local maximum of the stars are searched |
| RADIUS: | The radius of the circular aperture used for photometry |
Switches
| /u: | Do photometry for U-Band (epsilon = 3.274) |
| /b: | Do photometry for B-Band (epsilon = 3.674) |
| /v: | Do photometry for V-Band (epsilon = 3.581) |
| /r: | Do photometry for R-Band (epsilon = 3.479) |
| /i: | Do photometry for I-Band (epsilon = 3.386) |
| /j: | Do photometry for J-Band (epsilon = 3.248) |
| /h: | Do photometry for H-Band (epsilon = 3.08) |
| /k: | Do photometry for K-Band (epsilon = 2.8) (default) |
| /l: | Do photometry for L-Band (epsilon = 2.49) |
| /m: | Do photometry for M-Band (epsilon = 2.26) |
| /n: | Do photometry for N-Band (epsilon = 1.63) |