We have analyzed the photometry of 4 galaxies observed with
the 2MASS prototype camera and processed by the 3-channel GALWORKS
(hereafter referred to simply as GALWORKS) using the STSDAS package
in IRAF. Although
it is not a statistically illuminating sample, it is an interesting
comparison with the 2MASS photometry and gives us a first guess as
to what we can hope for from the 3-channel data. The photometry
itself has been broken up into three parts. The first part is the
examination of fixed radius circular and elliptical photometry where
all of the parameters for the IRAF photometric determinations are set
to match those from GALWORKS (the individual J, H, and K scans were
merged to form a "3-channel" data set; see Appendix D for details).
This first part is a sanity check since the answers from GALWORKS and
IRAF should be identical or nearly so. The second
part of the analysis consists of examining the petrosian and isophotal
radii and magnitudes for circular and fixed elliptical apertures. The
parameters of the apertures are again set to match the GALWORKS
parameters, but the petrosian and isophotal radii (and hence
magnitudes) are selected independantly. In the final part of the
analysis we allow IRAF to determine the parameters for the galaxies
independant of the GALWORKS values and compare the ellipticities
and position angles determined in this manner as well as the
petrosian and isophotal photometry to the pipline results.