Changes between Version 3 and Version 4 of psphot_extended_source_fit_20130712
- Timestamp:
- Sep 9, 2013, 11:01:30 AM (13 years ago)
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psphot_extended_source_fit_20130712
v3 v4 12 12 If we look at the sersic index for all galaxies we get the following histogram. The hisogram on the right shows the counts for pure disks and bulges. We see that the fits for bulges are clustered around 4 as expected while disks mostly have values near 1. 13 13 14 [[Image(sersic_index .jpg)]] [[Image(sersic_index_pure.jpg)]]14 [[Image(sersic_index_20130712.jpg)]] [[Image(sersic_index_pure_20130712.jpg)]] 15 15 16 16 === Sersic Fit Magnitudes === … … 18 18 The difference between the simulated galaxys' magnitudes and the sersic fit magnitudes are shown in the following plot. 91% of the sources are contained in the band near zero. The reason for the other bands needs to be investigated. 19 19 20 [[Image(dmag_sersic .jpg)]]20 [[Image(dmag_sersic_20130712.jpg)]] 21 21 22 22 If we consider only the pure bulge sources the fits are better. psphot under estimates the flux somewhat. If we look at pure disks we see the banding. 23 23 24 [[Image(dmag_sersic_bulges .jpg)]] [[Image(dmag_sersic_disks.jpg)]]24 [[Image(dmag_sersic_bulges_20130712.jpg)]] [[Image(dmag_sersic_disks_20130712.jpg)]] 25 25 26 26 The bands away from dmag == 0 are primarily objects with measured sersic index > 4.5 and small effective disk length.
