STEP 3: Results |
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Jason Rhodes, Catherine Heymans, Will High, Joel Berge, Gary Bernstein, Sarah Bridle, Thomas Erben, Christopher Hirata, Henk Hoekstra, Mike Jarvis, David Johnston, Rachel Mandelbaum, Yannick Mellier, Reiko Nakajima, Stephane Paulin-Henriksson, Molly Peeples, Alexandre Refregier, Tim Schrabback, Uros Seljak, Ludovic Van Waerbeke.
The third STEP project tests shear measurement methods on simulations of high resolution space-based data. Here we present the results of the blind analysis.
Summary of results
In summary, we find that:
ID | Lenser | Method |
JB | Joel Berge | Shapelets (Refregier 03) |
CH | Catherine Heymans | KSB+ |
RM | Rachel Mandelbaum | REGLENS (Hirata & Seljak 03 +) |
RN | Reiko Nakajima | BJ02 (Deconvolution method) |
SP | Stephane Paulin-Henriksson | KSB+ |
JR | Jason Rhodes | RRG |
TS | Tim Schrabback | KSB+ |
T2 | Tim Schrabback | KSB+ using high resolution PSF |
STEP3 simulations
STEP3 has 12 different simulations that have the following properties:
PSF ID | Pixel scale (arcsec) | PSF type | galaxy type |
A | 0.05 | SNAP | Shapelet |
B | 0.10 | SNAP | Shapelet |
C | 0.10 | 1.4m SNAP | Shapelet |
D | 0.04 | ACS | Shapelet |
E | 0.10 | ACS | Shapelet |
F | 0.04 | ACS | Exponential |
G | 0.10 | ACS | Exponential |
H | 0.04 | ACS | Shapelet |
I | 0.04 | ACS | Shapelet |
J | 0.04 | ACS | Shapelet |
K | 0.04 | ACS | Shapelet |
L | 0.04 | ACS | Shapelet |
STEP3 accuracy analysis; multiplicative and additive errors
The STEP shear catalogues have undergone the usual STEP analysis, quantifying errors in terms of a multiplicative error (m) and an additive error(c). You can download a plot of STEP m and c parameters for each lensers analysis of each PSF simulation, as listed above. A table of average m and c parameters, is also available, listing the average number density of galaxies (per sq arcmin) used in each analysis. Averages are taken over data with the same pixel scale.
Acknowledgments
We thank Caltech for hosting the STEP3 simulations, and for
providing the extensive computing resources required to produce them.
We also thank the Jet Propulsion Laboratory for financial and administrative
support of STEP workshops and teleconferences, and Marie Curie research grant
for financial support of STEP
teleconferences.
Last modified 21st April.
STEP pages maintained by Catherine Heymans: heymans[at]physics.ubc.ca