IPP Software Navigation Tools IPP Links Communication Pan-STARRS Links

Changes between Version 3 and Version 4 of psphot_extended_source_fit_20130712


Ignore:
Timestamp:
Sep 9, 2013, 11:01:30 AM (13 years ago)
Author:
bills
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • psphot_extended_source_fit_20130712

    v3 v4  
    1212If 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.
    1313
    14 [[Image(sersic_index.jpg)]] [[Image(sersic_index_pure.jpg)]]
     14[[Image(sersic_index_20130712.jpg)]] [[Image(sersic_index_pure_20130712.jpg)]]
    1515
    1616=== Sersic Fit Magnitudes ===
     
    1818The 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.
    1919
    20 [[Image(dmag_sersic.jpg)]]
     20[[Image(dmag_sersic_20130712.jpg)]]
    2121
    2222If 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.
    2323
    24 [[Image(dmag_sersic_bulges.jpg)]] [[Image(dmag_sersic_disks.jpg)]]
     24[[Image(dmag_sersic_bulges_20130712.jpg)]] [[Image(dmag_sersic_disks_20130712.jpg)]]
    2525
    2626The bands away from dmag == 0 are primarily objects with measured sersic index > 4.5 and small effective disk length.