1. How to use galfit (and galphot)
Gijs Verdoes Kleijn

2. Galfit (& Galphot) Galfit: 2-D galaxy profile fitting routines (C)
Author: Chien Peng (STScI)
Awe-status: basics incorporated
Reference:
zwicky.as.arizona.edu/~cyp/work/galfit/galfit.html
Peng etal 2002 AJ 124, 266
Galphot: ellipse fitting routine (fortran)
Author: Marijn Franx (Leiden)
To be incorporated
ref:
Franx etal 1989 AJ 98, 538

3. What galfit does
fitting 2-D parameterized axisymmetric functions to images
Any (in)dependent combination of Sersic(devauc/expo),nuker,gaussian,king,moffat,sky
Disky/boxy shapes
Error weighing
Inclusion PSF via FFT
Meant for well resolved galaxies: explore sub-structure
Future plans of galfit: more profiles, more isophotal shapes, allow for axial twists, spiral structure.
No batch mode perl scripts exist (used for GEMS survey)

4. Astro-WISE implementation
Python wrapper:
Give input to galfit c-code from python
Input+output+links to SourceList contained in classes instances of which are stored in database
no alteration c-code
Written by Ewout Helmich, help from C. Trachternach & GVK
Description
Input: SLID, SID, cut-out via cut-out server, configuration parameters
Defaults for configuration parameters based on SourceList
Initial guess x position: SourceList x position
Size cut-out image: 15* SourceList r_eff

5. Examples of usage (see how-to)
Run galfit using local cpu:
awe>from DBRecipes.GalFit import GalFitTask
awe>task = GalFitTask(instrument='WFI', slid=57424, sids=[31,52,73], models=['sersic', 'sky'], commit=1)
awe>task.execute()
Run galfit using parallel cluster:
awe>from astro.net.dpu import Processor
awe> from astro.local.Environment import Env
awe>dpu = Processor(Env['dpu_name'])
awe>dpu.run('GalFit', i='WFI', slid=57424, sids=[31,52,,73], m=['sersic', 'sky'], commit=1)

6. Examples continued
Show model parameters for SLID=57424, SID=[31,52,73] for last run:
awe> mysources = [(57424, 31), (57424, 52), (57424, 73)]
awe>models = []
awe>for slid, sid in mysources:
awe> q = (GalFitModel.SLID == slid) & (GalFitModel.SID == sid)
awe> model = q.max('GFID')
awe> models.append(model)
awe>for m in models:
awe> m.show_model_parameters()

7. Now & Future Code itself can be found at: Current implementation
opipe/astro/main/GalFitModel.py (show it)
opipe/DBRecipes/GalFit.py (Task)
Current implementation
Sersic+sky on ReducedScienceFrame,RegriddedFrame
Contaminant fitting included
Next steps
All profiles (Sersic+sky implemented: rest coming soon
Psf convolution
Background subtraction statistics right
Constraints file inclusion

8. Summary
Surface photometry tools getting ready in Astro-WISE for large data sets:
GalFit implemented basics, more coming soon
Easy (re-)processing and inspecting of galfit results on large number of galaxies
GalPhot is coming…..