LSST+Euclid: galaxy shape measurement synergies Robert L. Schuhmann - - PowerPoint PPT Presentation

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LSST+Euclid: galaxy shape measurement synergies

Robert L. Schuhmann (IfA Edinburgh, U Manchester)

collaborators: Joe Zuntz, Catherine Heymans

SLIDE 2

LSST and Euclid

image credit: LSST/NSF/AURA – ESA/C. Carreau

SLIDE 3

galaxy shapes: exploring synergies

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shape catalogue

• 0.2” pixels
• Gaussian PSF 0.7”
• noise-free
• 0.1” pixels
• Gaussian PSF 0.06”
• realistic CCD noise

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SLIDE 4

input catalogue

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SLIDE 5

high-res limited-depth imaging (Euclid-like)

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SLIDE 6

noise-free low-res imaging (LSST-like)

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SLIDE 7

joint shapes: catalogue-level comb.

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SLIDE 8

joint shapes: pixel-level comb.

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SLIDE 9

relative comparison to Joint Pixel Analysis

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SLIDE 10

future work

• improvements in calibrating multiplicative bias
• simulating proper co-adding; more complex PSF models
• more galaxy profjles
• astrometry + PSF confusion
• blending!!
• … (your suggestion here!)

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SLIDE 11

Thank you for your attention!

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… questions?