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MOPEX User's Guide - IRSA

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<strong>MOPEX</strong> User’s <strong>Guide</strong><br />

\int ImageY = 256<br />

\int PRF_Filename_1 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.fits<br />

\int PRF_Filename_2 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.fits<br />

\int PRF_Filename_3 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.fits<br />

\int PRFSigma_Filename_1 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.Sigma.fits<br />

\int PRFSigma_Filename_2 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.Sigma.fits<br />

\int PRFSigma_Filename_3 = /home/joe/Mopex/PRFs/IRAC.3.8um.PRF.12.Sigma.fits<br />

|PRFNum| NAXIS1| NAXIS2| PRFPos1| PRFPos2|<br />

|i |i |i |i |i |<br />

1 100 200 1 1<br />

2 256 56 1 201<br />

3 50 50 101 1<br />

2 156 150 101 51<br />

1 106 50 151 1<br />

The geometry for the above table file:<br />

-------------------------------<br />

| PRF #2 |<br />

| |<br />

|-----------------------------|<br />

| | |<br />

| | |<br />

| | PRF #2 |<br />

| | |<br />

| | |<br />

| | |<br />

| | |<br />

| PRF #1|---------------------|<br />

| | | |<br />

| | PRF #3 | PRF #1 |<br />

-------------------------------<br />

8.8 Aperture Photometry<br />

Circular aperture photometry can be done for each source. The photometry can be calculated on<br />

the original or background-subtracted image. If done on the original image, the background can<br />

be estimated in a circular annulus. The program sums the flux encircled by the aperture centered<br />

on the source using fractional pixel areas (see Figure 8.25). APEX Multiframe does aperture<br />

photometry on the mosaic, not the individual images. Aperture photometry AP is equal to<br />

Basic Concepts in <strong>MOPEX</strong> 214<br />

Aperture Photometry

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