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Testing Galfit. 1 Astronomisches Institut, Ruhr-Uni Bochum 2 Kapteyn Instituut, Rijks-Universiteit Groningen 3 Argelander Institut für Astronomie, Uni Bonn.

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Testing galfit

Testing Galfit

1Astronomisches Institut, Ruhr-Uni Bochum

2Kapteyn Instituut, Rijks-Universiteit Groningen

3Argelander Institut für Astronomie, Uni Bonn

Clemens Trachternach1, Olaf Schmithüsen1, Gijs Verdoes Klein2, Ewout Helmich2, Dominik Bomans1 ,Ralf-Jürgen Dettmar1, Oliver-Mark Cordes3, Thomas Erben3, Hendrik Hildebrandt3, Patrick Hudelot3, …


Cfhtls canada france hawaii telescope legacy survey
CFHTLSCanada France Hawaii Telescope Legacy Survey

  • 36 CCDs

  • 1 deg² FoV

  • 1.2hr exposure time in i-band

  • MagZP = 25.75 mag

  • Seeing 0.95’’

  • Comparable to the KIDS data

Astro-WISE Workshop 2006


Contaminant correction
Contaminant correction

  • Galfit does χ²-minimization “at all costs“

  • Galfit needs to know that there is a second object (or third, or…) to fit it with a new component

  • Need to think of selection criteria for primary AND secondary objects

    One possibility (the one I made my tests with):

  • Object inside fitting region, near primary object and not more than “a few“ magnitudes fainter

  • Object just outside fitting region but brighter than primary

     add component

Astro-WISE Workshop 2006


Contaminant correction1
Contaminant correction

Astro-WISE Workshop 2006


Running Galfit with different profiles

DETECT_MINAREA (for 2nd object): 30

MINAREA_PRIMARY: 100

~35000 objects in catalogue

~ 11800 objects as “primary” objects

Astro-WISE Workshop 2006


Galfit got stuck

Astro-WISE Workshop 2006


Galfit got stuck

Need a maximum number of iterations

If this already exists

 Check why it didn’t stop

Galfit got stuck

Astro-WISE Workshop 2006


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